Rails - Feb 2007 - Ruby/rails port of Cocoon/hibernate

Hi,
I''m currently running an apache/jboss cocoon/flow/hibernate/ajax
paypal (directpayment) project and am looking into the possibility of
porting it across to ruby/rails. For that reason I would like to know
the following:

1. Can I call my java classes or would I be looking at a complete
rewrite in ruby?
2. How effective is ruby in terms of seperation of concerns regarding
design from content?
3. I have a number of hibernate maps accessing various postgresql
tables. Can I reverse engineer those tables into rails (maps?) ?
4. In cocoons mvc (flowscript) it is possible to instantiate and call
class methods from within the document at the same time as directing
flow. Is this possible in ruby/rails?

--
Regards

Andrew


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Ok, to start with, I don''t really understand what #4 means, but I think
I
can address the other well enough:
#1: If the application is fairly complex, you''d probably be looking at
a
full re-write... however, there is a project called JRuby that is attempting
to change that statement.  It allows you to run Ruby scripts on the JVM, and
it allows you to reach out to existing Java code and call things in it...
however, it''s support for Rails isn''t 100% atm... it can do
basic stuff,
moving on up into intermediate, but extremely complex code is better left
outside of JRuby atm.
#2: Excellent.  It is on par with the best of any other framework I have
ever known in this regard.
#3: Using Rails, you generally don''t have to do much of anything to
support
already existing tables... Rails just reads in the schema info from the DB,
and auto-generates all kinds of nifty things for you... the minor exception
to this is that if you aren''t using the default names that Rails likes
in
your DB (it wants the primary key auto-increment id field to be named id,
etc) you have to specify them in your file like so:
class User < ActiveRecord::Base
  set_primary_key "userid"
end

Many people find On LAMP''s Rolling with Ruby on Rails tutorial a great
place
to find out what Rails can offer: the revisited tutorial is particularly
good in this respect:
http://www.onlamp.com/pub/a/onlamp/2006/12/14/revisiting-ruby-on-rails-revisited.html

On 2/26/07, Andrew <andrewmadu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
>
>
> Hi,
> I''m currently running an apache/jboss cocoon/flow/hibernate/ajax
> paypal (directpayment) project and am looking into the possibility of
> porting it across to ruby/rails. For that reason I would like to know
> the following:
>
> 1. Can I call my java classes or would I be looking at a complete
> rewrite in ruby?
> 2. How effective is ruby in terms of seperation of concerns regarding
> design from content?
> 3. I have a number of hibernate maps accessing various postgresql
> tables. Can I reverse engineer those tables into rails (maps?) ?
> 4. In cocoons mvc (flowscript) it is possible to instantiate and call
> class methods from within the document at the same time as directing
> flow. Is this possible in ruby/rails?
>
> --
> Regards
>
> Andrew
>
>
> >
>
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Hi Luke,
many thanks for the information you have provided thus far.

In regards to my question 4, an example might suffice: (myArtistDetails.js)

importClass(Packages.test.Artist); Flows equivalent of package test; import
Artist;

function artistDetails() {

    try {
        artistID = cocoon.parameters.artistID;//either use defined or
specified from dB
        artist = Artist.getArtist(artistID); //Artist id passed into class
method

        artist_name = artist.getArtistName();//artist name is obtained from
the Artist class
        artist_info = artist.getArtistInfo();// as above

    }catch(e) {
    }

   
cocoon.sendPageAndWait("artistDetails2.xml",{"artistID":artistID,"artist_name":artist_name,"artist_info":artist_info});
//MVC: flow is directed to rtistDetails2.xml with associated values
}

In the above flow (MVC) document a java class is imported, its method
interrogated and corresponding values passed onto the next document in line.
How would this be handled in Ruby/Rails, such that an action on a web page
causes artistDetaills() to be called and then directed on to
artistDetails2.xml?

Am I correct in thinking that rails is a mapping technology much like
hibernate?

--
Regards

Andrew

On 26/02/07, Luke Ivers
<technodolt-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
>
> Ok, to start with, I don''t really understand what #4 means, but I
think I
> can address the other well enough:
> #1: If the application is fairly complex, you''d probably be
looking at a
> full re-write... however, there is a project called JRuby that is
attempting
> to change that statement.  It allows you to run Ruby scripts on the JVM,
and
> it allows you to reach out to existing Java code and call things in it...
> however, it''s support for Rails isn''t 100% atm... it can
do basic stuff,
> moving on up into intermediate, but extremely complex code is better left
> outside of JRuby atm.
> #2: Excellent.  It is on par with the best of any other framework I have
> ever known in this regard.
> #3: Using Rails, you generally don''t have to do much of anything
to
> support already existing tables... Rails just reads in the schema info from
> the DB, and auto-generates all kinds of nifty things for you... the minor
> exception to this is that if you aren''t using the default names
that Rails
> likes in your DB (it wants the primary key auto-increment id field to be
> named id, etc) you have to specify them in your file like so:
> class User < ActiveRecord::Base
>   set_primary_key "userid"
> end
>
> Many people find On LAMP''s Rolling with Ruby on Rails tutorial a
great
> place to find out what Rails can offer: the revisited tutorial is
> particularly good in this respect:
>
>
http://www.onlamp.com/pub/a/onlamp/2006/12/14/revisiting-ruby-on-rails-revisited.html
>
> On 2/26/07, Andrew
<andrewmadu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> >
> >
> > Hi,
> > I''m currently running an apache/jboss
cocoon/flow/hibernate/ajax
> > paypal (directpayment) project and am looking into the possibility of
> > porting it across to ruby/rails. For that reason I would like to know
> > the following:
> >
> > 1. Can I call my java classes or would I be looking at a complete
> > rewrite in ruby?
> > 2. How effective is ruby in terms of seperation of concerns regarding
> > design from content?
> > 3. I have a number of hibernate maps accessing various postgresql
> > tables. Can I reverse engineer those tables into rails (maps?) ?
> > 4. In cocoons mvc (flowscript) it is possible to instantiate and call
> > class methods from within the document at the same time as directing
> > flow. Is this possible in ruby/rails?
> >
> > --
> > Regards
> >
> > Andrew
> >
> >
> >
> >
> >
>
> >
>
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It can be used as such, although I''m not sure that I would call that
it''s
default application.
And you could do exactly what you''re asking using AJAX and
Rails''s links to
it... it is one of the major aspects of Rails that promotes it above and
beyond most of the other frameworks available... you could even have it load
up the artistDetails2.xml file into the page it''s already on, instead
of
directing them to yet another page.

On 2/26/07, Andrew Madu
<andrewmadu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
>
> Hi Luke,
> many thanks for the information you have provided thus far.
>
> In regards to my question 4, an example might suffice: (myArtistDetails.js
> )
>
> importClass(Packages.test.Artist); Flows equivalent of package test;
> import Artist;
>
> function artistDetails() {
>
>     try {
>         artistID = cocoon.parameters.artistID;//either use defined or
> specified from dB
>         artist = Artist.getArtist(artistID); //Artist id passed into class
> method
>
>         artist_name = artist.getArtistName();//artist name is obtained
> from the Artist class
>         artist_info = artist.getArtistInfo();// as above
>
>     }catch(e) {
>     }
>
>    
cocoon.sendPageAndWait("artistDetails2.xml",{"artistID":artistID,"artist_name":artist_name,"artist_info":artist_info});
> //MVC: flow is directed to rtistDetails2.xml with associated values
> }
>
> In the above flow (MVC) document a java class is imported, its method
> interrogated and corresponding values passed onto the next document in
line.
> How would this be handled in Ruby/Rails, such that an action on a web page
> causes artistDetaills() to be called and then directed on to
> artistDetails2.xml?
>
> Am I correct in thinking that rails is a mapping technology much like
> hibernate?
>
> --
> Regards
>
> Andrew
>
> On 26/02/07, Luke Ivers
<technodolt-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> >
> > Ok, to start with, I don''t really understand what #4 means,
but I think
> > I can address the other well enough:
> > #1: If the application is fairly complex, you''d probably be
looking at a
> > full re-write... however, there is a project called JRuby that is
attempting
> > to change that statement.  It allows you to run Ruby scripts on the
JVM, and
> > it allows you to reach out to existing Java code and call things in
it...
> > however, it''s support for Rails isn''t 100% atm... it
can do basic stuff,
> > moving on up into intermediate, but extremely complex code is better
left
> > outside of JRuby atm.
> > #2: Excellent.  It is on par with the best of any other framework I
have
> > ever known in this regard.
> > #3: Using Rails, you generally don''t have to do much of
anything to
> > support already existing tables... Rails just reads in the schema info
from
> > the DB, and auto-generates all kinds of nifty things for you... the
minor
> > exception to this is that if you aren''t using the default
names that Rails
> > likes in your DB (it wants the primary key auto-increment id field to
be
> > named id, etc) you have to specify them in your file like so:
> > class User < ActiveRecord::Base
> >   set_primary_key "userid"
> > end
> >
> > Many people find On LAMP''s Rolling with Ruby on Rails
tutorial a great
> > place to find out what Rails can offer: the revisited tutorial is
> > particularly good in this respect:
> >
http://www.onlamp.com/pub/a/onlamp/2006/12/14/revisiting-ruby-on-rails-revisited.html
> >
> >
> > On 2/26/07, Andrew
<andrewmadu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > >
> > >
> > > Hi,
> > > I''m currently running an apache/jboss
cocoon/flow/hibernate/ajax
> > > paypal (directpayment) project and am looking into the
possibility of
> > > porting it across to ruby/rails. For that reason I would like to
know
> > > the following:
> > >
> > > 1. Can I call my java classes or would I be looking at a complete
> > > rewrite in ruby?
> > > 2. How effective is ruby in terms of seperation of concerns
regarding
> > > design from content?
> > > 3. I have a number of hibernate maps accessing various postgresql
> > > tables. Can I reverse engineer those tables into rails (maps?) ?
> > > 4. In cocoons mvc (flowscript) it is possible to instantiate and
call
> > > class methods from within the document at the same time as
directing
> > > flow. Is this possible in ruby/rails?
> > >
> > > --
> > > Regards
> > >
> > > Andrew
> > >
> > >
> > >
> > >
> > >
> >
> >
> >
>
> >
>
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Hi Andrew,

I come from a JBoss/J2EE/Java background and I have been working on my
first RoR project for the last several months... all-in-all it is a
pleasure! If you are new to RoR, it will take a bit to get used to the
syntax but once you do, it is amazing how quickly one can get things
done and do it in a structured, test-oriented way.

RoR has ActiveRecord that is analagous to Hibernate or EJB3. It
supports many of the features and maps relationships nicely. Some of
the features I don''t see (someone please correct me if I am wrong)
are:
- lazy-loading/eager-loading ability
- object caching (like JBoss Cache)

In your situation, I wonder, rather than do a total immediate rewrite,
seeing you are using JBoss, why not keep JBoss as your object/db
broker with Hibernate and extend it out using Web Services and call
that from a RoR front-end? That way, you could migrate slowly rather
than wholesale.

Scott

On Feb 27, 7:51 am, "Luke Ivers"
<technod...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> It can be used as such, although I''m not sure that I would call
that it''s
> default application.
> And you could do exactly what you''re asking using AJAX and
Rails''s links to
> it... it is one of the major aspects of Rails that promotes it above and
> beyond most of the other frameworks available... you could even have it
load
> up the artistDetails2.xml file into the page it''s already on,
instead of
> directing them to yet another page.
>
> On 2/26/07, Andrew Madu
<andrewm...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
>
>
> > Hi Luke,
> > many thanks for the information you have provided thus far.
>
> > In regards to my question 4, an example might suffice:
(myArtistDetails.js
> > )
>
> > importClass(Packages.test.Artist); Flows equivalent of package test;
> > import Artist;
>
> > function artistDetails() {
>
> >     try {
> >         artistID = cocoon.parameters.artistID;//either use defined or
> > specified from dB
> >         artist = Artist.getArtist(artistID); //Artist id passed into
class
> > method
>
> >         artist_name = artist.getArtistName();//artist name is obtained
> > from the Artist class
> >         artist_info = artist.getArtistInfo();// as above
>
> >     }catch(e) {
> >     }
>
> >    
cocoon.sendPageAndWait("artistDetails2.xml",{"artistID":artistID,"artist_na
me":artist_name,"artist_info":artist_info});
> > //MVC: flow is directed to rtistDetails2.xml with associated values
> > }
>
> > In the above flow (MVC) document a java class is imported, its method
> > interrogated and corresponding values passed onto the next document in
line.
> > How would this be handled in Ruby/Rails, such that an action on a web
page
> > causes artistDetaills() to be called and then directed on to
> > artistDetails2.xml?
>
> > Am I correct in thinking that rails is a mapping technology much like
> > hibernate?
>
> > --
> > Regards
>
> > Andrew
>
> > On 26/02/07, Luke Ivers
<technod...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> > > Ok, to start with, I don''t really understand what #4
means, but I think
> > > I can address the other well enough:
> > > #1: If the application is fairly complex, you''d probably
be looking at a
> > > full re-write... however, there is a project called JRuby that is
attempting
> > > to change that statement.  It allows you to run Ruby scripts on
the JVM, and
> > > it allows you to reach out to existing Java code and call things
in it...
> > > however, it''s support for Rails isn''t 100%
atm... it can do basic stuff,
> > > moving on up into intermediate, but extremely complex code is
better left
> > > outside of JRuby atm.
> > > #2: Excellent.  It is on par with the best of any other framework
I have
> > > ever known in this regard.
> > > #3: Using Rails, you generally don''t have to do much of
anything to
> > > support already existing tables... Rails just reads in the schema
info from
> > > the DB, and auto-generates all kinds of nifty things for you...
the minor
> > > exception to this is that if you aren''t using the
default names that Rails
> > > likes in your DB (it wants the primary key auto-increment id
field to be
> > > named id, etc) you have to specify them in your file like so:
> > > class User < ActiveRecord::Base
> > >   set_primary_key "userid"
> > > end
>
> > > Many people find On LAMP''s Rolling with Ruby on Rails
tutorial a great
> > > place to find out what Rails can offer: the revisited tutorial is
> > > particularly good in this respect:
> >
>http://www.onlamp.com/pub/a/onlamp/2006/12/14/revisiting-ruby-on-rail...
>
> > > On 2/26/07, Andrew
<andrewm...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> > > > Hi,
> > > > I''m currently running an apache/jboss
cocoon/flow/hibernate/ajax
> > > > paypal (directpayment) project and am looking into the
possibility of
> > > > porting it across to ruby/rails. For that reason I would
like to know
> > > > the following:
>
> > > > 1. Can I call my java classes or would I be looking at a
complete
> > > > rewrite in ruby?
> > > > 2. How effective is ruby in terms of seperation of concerns
regarding
> > > > design from content?
> > > > 3. I have a number of hibernate maps accessing various
postgresql
> > > > tables. Can I reverse engineer those tables into rails
(maps?) ?
> > > > 4. In cocoons mvc (flowscript) it is possible to instantiate
and call
> > > > class methods from within the document at the same time as
directing
> > > > flow. Is this possible in ruby/rails?
>
> > > > --
> > > > Regards
>
> > > > Andrew

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Hi Scott,
my appetite is definitely being whetted!! Please see my replies below:

> I come from a JBoss/J2EE/Java background and I have been working on my
> first RoR project for the last several months... all-in-all it is a
> pleasure! If you are new to RoR, it will take a bit to get used to the
> syntax but once you do, it is amazing how quickly one can get things
> done and do it in a structured, test-oriented way.


From the various docs and examples I have seen it definitely does seem like
a quick development environment!

RoR has ActiveRecord that is analagous to Hibernate or EJB3.
It
> supports many of the features and maps relationships nicely. Some of
> the features I don''t see (someone please correct me if I am wrong)
> are:
> - lazy-loading/eager-loading ability
> - object caching (like JBoss Cache)


OK! I am using hibernate with ehcache handling lazy object caching. Can
anyone else confirm whether ActiveRecord supports lazy-loading/object
caching?

In your situation, I wonder, rather than do a total immediate
rewrite,
> seeing you are using JBoss, why not keep JBoss as your object/db
> broker with Hibernate and extend it out using Web Services and call
> that from a RoR front-end? That way, you could migrate slowly rather
> than wholesale.


Great idea! I will look into this as a viable option.

The five main areas of concern to me are as follows:

1. Database.
I am using postgreSQL 8.1. Would rails be able to reverse engineer the
required ActiveRecord maps from the dB schema? From what I understand of
rails convention table names need to be pluralized. How would the reverse
engineering process handle the fact that none of my table names are
pluralized?!

2. Form validation
I am using Ajax to handle all form validation in cocoon. In cocoon form
dev/validation would be handled by:

a. Specifying that you wish Ajax to handle validation as so:

<ft:form-template action="login.kont" name="Form1"
method="POST"
ajax="true">

b.  Defining your form widgets in a seperate document as so:
                                  <ft:widget id="password">
                                      <fi:styling size="30"
type="password"
class="keyinbox" style="background-color:#C9C4BD;" />
                                  </ft:widget>

c. Defining your validation, against your widgest, in another document as
so:

         <fd:field id="password" required="true">
          <fd:datatype base="string"/>
          <fd:validation>
            <fd:length min="5" max="20"/>
          </fd:validation>
         </fd:field>

3. Paypal API.

I have recently come across a ruby/rails Paypal (directpayment api) so this
area is covered.

4. Image handling.

All artist images are stored in postgresql and read into the webapp as svg
via Base64. Cocoon then allows for an svgTOpng or svgTOjpeg conversion
before the image is rendered to the page. As an example I have various img
calls defined as such:

<image src="artistImage/${artistID}/228/202/${stock_code}.svg"
alt="${artist_name} - ${track_title}"/>

So in effect the img tag is making a call to the database which in turn
return the appropriate binary information, holds it in svg format before
converting it to either PNG or JPEG. How would ruby/rails handle this?

5. Email/Zip
I have a process where by the artist track files (mp3) a user may have
ordered are pulled out from their order/order_items object, read in the file
system directory and then zipped up. This zip is then emailed to the user.
How would ruby/rails handle this process?

--
Regards

Andrew




Scott
>
> On Feb 27, 7:51 am, "Luke Ivers"
<technod...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > It can be used as such, although I''m not sure that I would
call that
> it''s
> > default application.
> > And you could do exactly what you''re asking using AJAX and
Rails''s links
> to
> > it... it is one of the major aspects of Rails that promotes it above
and
> > beyond most of the other frameworks available... you could even have
it
> load
> > up the artistDetails2.xml file into the page it''s already on,
instead of
> > directing them to yet another page.
> >
> > On 2/26/07, Andrew Madu
<andrewm...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> >
> >
> >
> > > Hi Luke,
> > > many thanks for the information you have provided thus far.
> >
> > > In regards to my question 4, an example might suffice: (
> myArtistDetails.js
> > > )
> >
> > > importClass(Packages.test.Artist); Flows equivalent of package
test;
> > > import Artist;
> >
> > > function artistDetails() {
> >
> > >     try {
> > >         artistID = cocoon.parameters.artistID;//either use
defined or
> > > specified from dB
> > >         artist = Artist.getArtist(artistID); //Artist id passed
into
> class
> > > method
> >
> > >         artist_name = artist.getArtistName();//artist name is
obtained
> > > from the Artist class
> > >         artist_info = artist.getArtistInfo();// as above
> >
> > >     }catch(e) {
> > >     }
> >
> > >    
cocoon.sendPageAndWait("artistDetails2.xml",{"artistID":artistID,"artist_na
> me":artist_name,"artist_info":artist_info});
> > > //MVC: flow is directed to rtistDetails2.xml with associated
values
> > > }
> >
> > > In the above flow (MVC) document a java class is imported, its
method
> > > interrogated and corresponding values passed onto the next
document in
> line.
> > > How would this be handled in Ruby/Rails, such that an action on a
web
> page
> > > causes artistDetaills() to be called and then directed on to
> > > artistDetails2.xml?
> >
> > > Am I correct in thinking that rails is a mapping technology much
like
> > > hibernate?
> >
> > > --
> > > Regards
> >
> > > Andrew
> >
> > > On 26/02/07, Luke Ivers
<technod...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> >
> > > > Ok, to start with, I don''t really understand what
#4 means, but I
> think
> > > > I can address the other well enough:
> > > > #1: If the application is fairly complex, you''d
probably be looking
> at a
> > > > full re-write... however, there is a project called JRuby
that is
> attempting
> > > > to change that statement.  It allows you to run Ruby scripts
on the
> JVM, and
> > > > it allows you to reach out to existing Java code and call
things in
> it...
> > > > however, it''s support for Rails isn''t 100%
atm... it can do basic
> stuff,
> > > > moving on up into intermediate, but extremely complex code
is better
> left
> > > > outside of JRuby atm.
> > > > #2: Excellent.  It is on par with the best of any other
framework I
> have
> > > > ever known in this regard.
> > > > #3: Using Rails, you generally don''t have to do
much of anything to
> > > > support already existing tables... Rails just reads in the
schema
> info from
> > > > the DB, and auto-generates all kinds of nifty things for
you... the
> minor
> > > > exception to this is that if you aren''t using the
default names that
> Rails
> > > > likes in your DB (it wants the primary key auto-increment id
field
> to be
> > > > named id, etc) you have to specify them in your file like
so:
> > > > class User < ActiveRecord::Base
> > > >   set_primary_key "userid"
> > > > end
> >
> > > > Many people find On LAMP''s Rolling with Ruby on
Rails tutorial a
> great
> > > > place to find out what Rails can offer: the revisited
tutorial is
> > > > particularly good in this respect:
> > > >
> http://www.onlamp.com/pub/a/onlamp/2006/12/14/revisiting-ruby-on-rail...
> >
> > > > On 2/26/07, Andrew
<andrewm...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> >
> > > > > Hi,
> > > > > I''m currently running an apache/jboss
cocoon/flow/hibernate/ajax
> > > > > paypal (directpayment) project and am looking into the
possibility
> of
> > > > > porting it across to ruby/rails. For that reason I
would like to
> know
> > > > > the following:
> >
> > > > > 1. Can I call my java classes or would I be looking at
a complete
> > > > > rewrite in ruby?
> > > > > 2. How effective is ruby in terms of seperation of
concerns
> regarding
> > > > > design from content?
> > > > > 3. I have a number of hibernate maps accessing various
postgresql
> > > > > tables. Can I reverse engineer those tables into rails
(maps?) ?
> > > > > 4. In cocoons mvc (flowscript) it is possible to
instantiate and
> call
> > > > > class methods from within the document at the same time
as
> directing
> > > > > flow. Is this possible in ruby/rails?
> >
> > > > > --
> > > > > Regards
> >
> > > > > Andrew
>
>
> >
>
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My personal experience with Cocoon / JBoss / etc tells me to NEVER just port
code from these frameworks to Rails. Rewrite the application in Rails, from
scratch, redoing even the database if you are allowed to. The end result
will be a pure-Rails site, which is vastly easier to develop and maintain
than any Java solutions have ever been or will ever be. If you go trying to
copy the way said Java solutions do things, you will end up with an
unmaintainable mess, if you finish it at all. Rails works best when you let
Rails do what it wants to do.

As for specific answers:

2) Look into RJS. This acts much in the same way as what Cocoon seems to do,
defining partials of HTML code that get pushed to the client.

4) Check out the fleximage plugin:
http://agilewebdevelopment.com/plugins/fleximage Should take care of all
your needs with this.

Jason

On 2/27/07, Andrew Madu
<andrewmadu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
>
> Hi Scott,
> my appetite is definitely being whetted!! Please see my replies below:
>
>
> > I come from a JBoss/J2EE/Java background and I have been working on my
> > first RoR project for the last several months... all-in-all it is a
> > pleasure! If you are new to RoR, it will take a bit to get used to the
> > syntax but once you do, it is amazing how quickly one can get things
> > done and do it in a structured, test-oriented way.
>
>
>
> From the various docs and examples I have seen it definitely does seem
> like a quick development environment!
>
> RoR has ActiveRecord that is analagous to Hibernate or EJB3. It
> > supports many of the features and maps relationships nicely. Some of
> > the features I don''t see (someone please correct me if I am
wrong)
> > are:
> > - lazy-loading/eager-loading ability
> > - object caching (like JBoss Cache)
>
>
>
> OK! I am using hibernate with ehcache handling lazy object caching. Can
> anyone else confirm whether ActiveRecord supports lazy-loading/object
> caching?
>
> In your situation, I wonder, rather than do a total immediate rewrite,
> > seeing you are using JBoss, why not keep JBoss as your object/db
> > broker with Hibernate and extend it out using Web Services and call
> > that from a RoR front-end? That way, you could migrate slowly rather
> > than wholesale.
>
>
>
> Great idea! I will look into this as a viable option.
>
> The five main areas of concern to me are as follows:
>
> 1. Database.
> I am using postgreSQL 8.1. Would rails be able to reverse engineer the
> required ActiveRecord maps from the dB schema? From what I understand of
> rails convention table names need to be pluralized. How would the reverse
> engineering process handle the fact that none of my table names are
> pluralized?!
>
> 2. Form validation
> I am using Ajax to handle all form validation in cocoon. In cocoon form
> dev/validation would be handled by:
>
> a. Specifying that you wish Ajax to handle validation as so:
>
> <ft:form-template action=" login.kont" name="Form1"
method="POST"
> ajax="true">
>
> b.  Defining your form widgets in a seperate document as so:
>                                   <ft:widget id="password">
>                                       <fi:styling size="30"
> type="password" class="keyinbox"
style="background-color:#C9C4BD;" />
>                                   </ft:widget>
>
> c. Defining your validation, against your widgest, in another document as
> so:
>
>          <fd:field id="password" required="true">
>           <fd:datatype base="string"/>
>           <fd:validation>
>             <fd:length min="5" max="20"/>
>           </fd:validation>
>          </fd:field>
>
> 3. Paypal API.
>
> I have recently come across a ruby/rails Paypal (directpayment api) so
> this area is covered.
>
> 4. Image handling.
>
> All artist images are stored in postgresql and read into the webapp as svg
> via Base64. Cocoon then allows for an svgTOpng or svgTOjpeg conversion
> before the image is rendered to the page. As an example I have various img
> calls defined as such:
>
> <image src="artistImage/${artistID}/228/202/${stock_code}.svg"
> alt="${artist_name} - ${track_title}"/>
>
> So in effect the img tag is making a call to the database which in turn
> return the appropriate binary information, holds it in svg format before
> converting it to either PNG or JPEG. How would ruby/rails handle this?
>
> 5. Email/Zip
> I have a process where by the artist track files (mp3) a user may have
> ordered are pulled out from their order/order_items object, read in the
file
> system directory and then zipped up. This zip is then emailed to the user.
> How would ruby/rails handle this process?
>
> --
> Regards
>
> Andrew
>
>
>
>
> Scott
> >
> > On Feb 27, 7:51 am, "Luke Ivers" <
technod...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > > It can be used as such, although I''m not sure that I
would call that
> > it''s
> > > default application.
> > > And you could do exactly what you''re asking using AJAX
and Rails''s
> > links to
> > > it... it is one of the major aspects of Rails that promotes it
above
> > and
> > > beyond most of the other frameworks available... you could even
have
> > it load
> > > up the artistDetails2.xml file into the page it''s
already on, instead
> > of
> > > directing them to yet another page.
> > >
> > > On 2/26/07, Andrew Madu
<andrewm...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > >
> > >
> > >
> > > > Hi Luke,
> > > > many thanks for the information you have provided thus far.
> > >
> > > > In regards to my question 4, an example might suffice: (
> > myArtistDetails.js
> > > > )
> > >
> > > > importClass(Packages.test.Artist); Flows equivalent of
package test;
> > > > import Artist;
> > >
> > > > function artistDetails() {
> > >
> > > >     try {
> > > >         artistID = cocoon.parameters.artistID;//either use
defined
> > or
> > > > specified from dB
> > > >         artist = Artist.getArtist(artistID); //Artist id
passed into
> > class
> > > > method
> > >
> > > >         artist_name = artist.getArtistName();//artist name
is
> > obtained
> > > > from the Artist class
> > > >         artist_info = artist.getArtistInfo();// as above
> > >
> > > >     }catch(e) {
> > > >     }
> > >
> > > >    
cocoon.sendPageAndWait("artistDetails2.xml",{"artistID":artistID,"artist_na
> > me":artist_name,"artist_info":artist_info});
> > > > //MVC: flow is directed to rtistDetails2.xml with associated
values
> > > > }
> > >
> > > > In the above flow (MVC) document a java class is imported,
its
> > method
> > > > interrogated and corresponding values passed onto the next
document
> > in line.
> > > > How would this be handled in Ruby/Rails, such that an action
on a
> > web page
> > > > causes artistDetaills() to be called and then directed on to
> > > > artistDetails2.xml?
> > >
> > > > Am I correct in thinking that rails is a mapping technology
much
> > like
> > > > hibernate?
> > >
> > > > --
> > > > Regards
> > >
> > > > Andrew
> > >
> > > > On 26/02/07, Luke Ivers
<technod...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > >
> > > > > Ok, to start with, I don''t really understand
what #4 means, but I
> > think
> > > > > I can address the other well enough:
> > > > > #1: If the application is fairly complex,
you''d probably be
> > looking at a
> > > > > full re-write... however, there is a project called
JRuby that is
> > attempting
> > > > > to change that statement.  It allows you to run Ruby
scripts on
> > the JVM, and
> > > > > it allows you to reach out to existing Java code and
call things
> > in it...
> > > > > however, it''s support for Rails isn''t
100% atm... it can do basic
> > stuff,
> > > > > moving on up into intermediate, but extremely complex
code is
> > better left
> > > > > outside of JRuby atm.
> > > > > #2: Excellent.  It is on par with the best of any other
framework
> > I have
> > > > > ever known in this regard.
> > > > > #3: Using Rails, you generally don''t have to
do much of anything
> > to
> > > > > support already existing tables... Rails just reads in
the schema
> > info from
> > > > > the DB, and auto-generates all kinds of nifty things
for you...
> > the minor
> > > > > exception to this is that if you aren''t using
the default names
> > that Rails
> > > > > likes in your DB (it wants the primary key
auto-increment id field
> > to be
> > > > > named id, etc) you have to specify them in your file
like so:
> > > > > class User < ActiveRecord::Base
> > > > >   set_primary_key "userid"
> > > > > end
> > >
> > > > > Many people find On LAMP''s Rolling with Ruby
on Rails tutorial a
> > great
> > > > > place to find out what Rails can offer: the revisited
tutorial is
> > > > > particularly good in this respect:
> > > >
>http://www.onlamp.com/pub/a/onlamp/2006/12/14/revisiting-ruby-on-rail.
> > ..
> > >
> > > > > On 2/26/07, Andrew
<andrewm...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > >
> > > > > > Hi,
> > > > > > I''m currently running an apache/jboss
cocoon/flow/hibernate/ajax
> >
> > > > > > paypal (directpayment) project and am looking into
the
> > possibility of
> > > > > > porting it across to ruby/rails. For that reason I
would like to
> > know
> > > > > > the following:
> > >
> > > > > > 1. Can I call my java classes or would I be
looking at a
> > complete
> > > > > > rewrite in ruby?
> > > > > > 2. How effective is ruby in terms of seperation of
concerns
> > regarding
> > > > > > design from content?
> > > > > > 3. I have a number of hibernate maps accessing
various
> > postgresql
> > > > > > tables. Can I reverse engineer those tables into
rails (maps?) ?
> >
> > > > > > 4. In cocoons mvc (flowscript) it is possible to
instantiate and
> > call
> > > > > > class methods from within the document at the same
time as
> > directing
> > > > > > flow. Is this possible in ruby/rails?
> > >
> > > > > > --
> > > > > > Regards
> > >
> > > > > > Andrew
> >
> >
> >
> >
> >
>
> >
>
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On 2/27/07, Scott <tamosunas-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
>
>
> Hi Andrew,
>
> I come from a JBoss/J2EE/Java background and I have been working on my
> first RoR project for the last several months... all-in-all it is a
> pleasure! If you are new to RoR, it will take a bit to get used to the
> syntax but once you do, it is amazing how quickly one can get things
> done and do it in a structured, test-oriented way.
>
> RoR has ActiveRecord that is analagous to Hibernate or EJB3. It
> supports many of the features and maps relationships nicely. Some of
> the features I don''t see (someone please correct me if I am wrong)
> are:
> - lazy-loading/eager-loading ability

Eager loading, sure.  You can put :include => blah on either your
associations or in the actual find calls to eager load whatever you need.
Lazy loading:
By default, associations are lazy loaded.  You can change this behaviour as
stated above.  There is no way, that I know of, to lazy load individual
fields (other than doing something like using a view to get a copy of the
table that doesn''t have the fields, then doing direct sql queries to
get the
field in question).


- object caching (like JBoss Cache)


For this one, you can easily use memcache... Rails is set up to work
excellently with it, and there''s a lot of great help around to get you
set
up... it''s not exactly a  Rails piece, but has been tightly integrated.

Also, in the current working version of Rails (called edge rails), all
actions (read: functions that you call that generally end up rendering the
html to the user) are cached by default... two identical queries will result
in only one trip to the DB.

In your situation, I wonder, rather than do a total immediate
rewrite,
> seeing you are using JBoss, why not keep JBoss as your object/db
> broker with Hibernate and extend it out using Web Services and call
> that from a RoR front-end? That way, you could migrate slowly rather
> than wholesale.
>
> Scott
>
>
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>
> OK! I am using hibernate with ehcache handling lazy object caching. Can
> > anyone else confirm whether ActiveRecord supports lazy-loading/object
> > caching?
> >
>
See my other message

> > 1. Database.
> > I am using postgreSQL 8.1. Would rails be able to reverse engineer the
> > required ActiveRecord maps from the dB schema? From what I understand
of
> > rails convention table names need to be pluralized. How would the
reverse
> > engineering process handle the fact that none of my table names are
> > pluralized?!
> >
>
Easy: you can tell your models specifically what table name to use, and it
will just go ahead and use them.
In essence, you create a model... say you have a person table, and you want
a Person model.
class Person < ActiveRecord::Base
  set_table_name ''person''
end
This will still draw in all your fields automatically and create accessors
for them and etc... one other want to consider is the id field... Rails
wants it to be named just flat out ''id'', but a lot of people
do something
like ''person_id''... you can use set_id_field

2. Form validation
> > I am using Ajax to handle all form validation in cocoon. In cocoon
form
> > dev/validation would be handled by:
> >
> > a. Specifying that you wish Ajax to handle validation as so:
> >
> > <ft:form-template action=" login.kont"
name="Form1" method="POST"
> > ajax="true">
> >
> > b.  Defining your form widgets in a seperate document as so:
> >                                   <ft:widget
id="password">
> >                                       <fi:styling
size="30"
> > type="password" class="keyinbox"
style="background-color:#C9C4BD;" />
> >                                   </ft:widget>
> >
> > c. Defining your validation, against your widgest, in another document
> > as so:
> >
> >          <fd:field id="password"
required="true">
> >           <fd:datatype base="string"/>
> >           <fd:validation>
> >             <fd:length min="5" max="20"/>
> >           </fd:validation>
> >          </fd:field>
> >
>
Ajax + Rails = super, super, super easy.

3. Paypal API.
> >
> > I have recently come across a ruby/rails Paypal (directpayment api) so
> > this area is covered.
> >
>
Definitely look into Active Merchant: it does Paypal and a TON of other
stuff... so if you switch, you''re still covered.

4. Image handling.
> >
> > All artist images are stored in postgresql and read into the webapp as
> > svg via Base64. Cocoon then allows for an svgTOpng or svgTOjpeg
conversion
> > before the image is rendered to the page. As an example I have various
img
> > calls defined as such:
> >
> > <image
src="artistImage/${artistID}/228/202/${stock_code}.svg"
> > alt="${artist_name} - ${track_title}"/>
> >
> > So in effect the img tag is making a call to the database which in
turn
> > return the appropriate binary information, holds it in svg format
before
> > converting it to either PNG or JPEG. How would ruby/rails handle this?
> >
>
You completely got me on this one... I''m sure it''s probably
possible, but I
don''t have a clue.

5. Email/Zip
> > I have a process where by the artist track files (mp3) a user may have
> > ordered are pulled out from their order/order_items object, read in
the file
> > system directory and then zipped up. This zip is then emailed to the
user.
> > How would ruby/rails handle this process?
> >
>
ActionMailer is your friend...  ruby comes with standard zipping stuff built
in, and ActionMailer is EXTREMELY easy to use to mail.

--
> > Regards
> >
> > Andrew
> >
> >
> >
> >
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Hi jason,

My personal experience with Cocoon / JBoss / etc tells me to NEVER just
port
> code from these frameworks to Rails.

Yes, I agree whole heartedly! I''m just trying to ascertain what what
technology within the ruby/rails framework will allow me to achieve the same
functionality as I currently have with the cocoon/hibernate framework

2) Look into RJS. This acts much in the same way as what Cocoon seems to
do,
> defining partials of HTML code that get pushed to the client.


I will look into RJS.

4) Check out the fleximage plugin:
> http://agilewebdevelopment.com/plugins/fleximage Should take care of all
> your needs with this.


The plugin looks fantastic. Thanks for that headsup!

--
Regards

Andrew

Jason
>
> On 2/27/07, Andrew Madu
<andrewmadu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> >
> > Hi Scott,
> > my appetite is definitely being whetted!! Please see my replies below:
> >
> >
> > > I come from a JBoss/J2EE/Java background and I have been working
on my
> > > first RoR project for the last several months... all-in-all it is
a
> > > pleasure! If you are new to RoR, it will take a bit to get used
to the
> > > syntax but once you do, it is amazing how quickly one can get
things
> > > done and do it in a structured, test-oriented way.
> >
> >
> >
> > From the various docs and examples I have seen it definitely does seem
> > like a quick development environment!
> >
> > RoR has ActiveRecord that is analagous to Hibernate or EJB3. It
> > > supports many of the features and maps relationships nicely. Some
of
> > > the features I don''t see (someone please correct me if I
am wrong)
> > > are:
> > > - lazy-loading/eager-loading ability
> > > - object caching (like JBoss Cache)
> >
> >
> >
> > OK! I am using hibernate with ehcache handling lazy object caching.
Can
> > anyone else confirm whether ActiveRecord supports lazy-loading/object
> > caching?
> >
> > In your situation, I wonder, rather than do a total immediate rewrite,
> > > seeing you are using JBoss, why not keep JBoss as your object/db
> > > broker with Hibernate and extend it out using Web Services and
call
> > > that from a RoR front-end? That way, you could migrate slowly
rather
> > > than wholesale.
> >
> >
> >
> > Great idea! I will look into this as a viable option.
> >
> > The five main areas of concern to me are as follows:
> >
> > 1. Database.
> > I am using postgreSQL 8.1. Would rails be able to reverse engineer the
> > required ActiveRecord maps from the dB schema? From what I understand
of
> > rails convention table names need to be pluralized. How would the
reverse
> > engineering process handle the fact that none of my table names are
> > pluralized?!
> >
> > 2. Form validation
> > I am using Ajax to handle all form validation in cocoon. In cocoon
form
> > dev/validation would be handled by:
> >
> > a. Specifying that you wish Ajax to handle validation as so:
> >
> > <ft:form-template action=" login.kont"
name="Form1" method="POST"
> > ajax="true">
> >
> > b.  Defining your form widgets in a seperate document as so:
> >                                   <ft:widget
id="password">
> >                                       <fi:styling
size="30"
> > type="password" class="keyinbox"
style="background-color:#C9C4BD;" />
> >                                   </ft:widget>
> >
> > c. Defining your validation, against your widgest, in another document
> > as so:
> >
> >          <fd:field id="password"
required="true">
> >           <fd:datatype base="string"/>
> >           <fd:validation>
> >             <fd:length min="5" max="20"/>
> >           </fd:validation>
> >          </fd:field>
> >
> > 3. Paypal API.
> >
> > I have recently come across a ruby/rails Paypal (directpayment api) so
> > this area is covered.
> >
> > 4. Image handling.
> >
> > All artist images are stored in postgresql and read into the webapp as
> > svg via Base64. Cocoon then allows for an svgTOpng or svgTOjpeg
conversion
> > before the image is rendered to the page. As an example I have various
img
> > calls defined as such:
> >
> > <image
src="artistImage/${artistID}/228/202/${stock_code}.svg"
> > alt="${artist_name} - ${track_title}"/>
> >
> > So in effect the img tag is making a call to the database which in
turn
> > return the appropriate binary information, holds it in svg format
before
> > converting it to either PNG or JPEG. How would ruby/rails handle this?
> >
> > 5. Email/Zip
> > I have a process where by the artist track files (mp3) a user may have
> > ordered are pulled out from their order/order_items object, read in
the file
> > system directory and then zipped up. This zip is then emailed to the
user.
> > How would ruby/rails handle this process?
> >
> > --
> > Regards
> >
> > Andrew
> >
> >
> >
> >
> > Scott
> > >
> > > On Feb 27, 7:51 am, "Luke Ivers" <
technod...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > > > It can be used as such, although I''m not sure that
I would call that
> > > it''s
> > > > default application.
> > > > And you could do exactly what you''re asking using
AJAX and Rails''s
> > > links to
> > > > it... it is one of the major aspects of Rails that promotes
it above
> > > and
> > > > beyond most of the other frameworks available... you could
even have
> > > it load
> > > > up the artistDetails2.xml file into the page it''s
already on,
> > > instead of
> > > > directing them to yet another page.
> > > >
> > > > On 2/26/07, Andrew Madu
<andrewm...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org > wrote:
> > > >
> > > >
> > > >
> > > > > Hi Luke,
> > > > > many thanks for the information you have provided thus
far.
> > > >
> > > > > In regards to my question 4, an example might suffice:
(
> > > myArtistDetails.js
> > > > > )
> > > >
> > > > > importClass(Packages.test.Artist); Flows equivalent of
package
> > > test;
> > > > > import Artist;
> > > >
> > > > > function artistDetails() {
> > > >
> > > > >     try {
> > > > >         artistID = cocoon.parameters.artistID;//either
use defined
> > > or
> > > > > specified from dB
> > > > >         artist = Artist.getArtist(artistID); //Artist
id passed
> > > into class
> > > > > method
> > > >
> > > > >         artist_name = artist.getArtistName();//artist
name is
> > > obtained
> > > > > from the Artist class
> > > > >         artist_info = artist.getArtistInfo();// as
above
> > > >
> > > > >     }catch(e) {
> > > > >     }
> > > >
> > > > >    
cocoon.sendPageAndWait("artistDetails2.xml",{"artistID":artistID,"artist_na
> > > me":artist_name,"artist_info":artist_info});
> > > > > //MVC: flow is directed to rtistDetails2.xml with
associated
> > > values
> > > > > }
> > > >
> > > > > In the above flow (MVC) document a java class is
imported, its
> > > method
> > > > > interrogated and corresponding values passed onto the
next
> > > document in line.
> > > > > How would this be handled in Ruby/Rails, such that an
action on a
> > > web page
> > > > > causes artistDetaills() to be called and then directed
on to
> > > > > artistDetails2.xml?
> > > >
> > > > > Am I correct in thinking that rails is a mapping
technology much
> > > like
> > > > > hibernate?
> > > >
> > > > > --
> > > > > Regards
> > > >
> > > > > Andrew
> > > >
> > > > > On 26/02/07, Luke Ivers <
technod...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > > >
> > > > > > Ok, to start with, I don''t really
understand what #4 means, but
> > > I think
> > > > > > I can address the other well enough:
> > > > > > #1: If the application is fairly complex,
you''d probably be
> > > looking at a
> > > > > > full re-write... however, there is a project
called JRuby that
> > > is attempting
> > > > > > to change that statement.  It allows you to run
Ruby scripts on
> > > the JVM, and
> > > > > > it allows you to reach out to existing Java code
and call things
> > > in it...
> > > > > > however, it''s support for Rails
isn''t 100% atm... it can do
> > > basic stuff,
> > > > > > moving on up into intermediate, but extremely
complex code is
> > > better left
> > > > > > outside of JRuby atm.
> > > > > > #2: Excellent.  It is on par with the best of any
other
> > > framework I have
> > > > > > ever known in this regard.
> > > > > > #3: Using Rails, you generally don''t have
to do much of anything
> > > to
> > > > > > support already existing tables... Rails just
reads in the
> > > schema info from
> > > > > > the DB, and auto-generates all kinds of nifty
things for you...
> > > the minor
> > > > > > exception to this is that if you aren''t
using the default names
> > > that Rails
> > > > > > likes in your DB (it wants the primary key
auto-increment id
> > > field to be
> > > > > > named id, etc) you have to specify them in your
file like so:
> > > > > > class User < ActiveRecord::Base
> > > > > >   set_primary_key "userid"
> > > > > > end
> > > >
> > > > > > Many people find On LAMP''s Rolling with
Ruby on Rails tutorial a
> > > great
> > > > > > place to find out what Rails can offer: the
revisited tutorial
> > > is
> > > > > > particularly good in this respect:
> > > > >
>http://www.onlamp.com/pub/a/onlamp/2006/12/14/revisiting-ruby-on-rail.
> > > ..
> > > >
> > > > > > On 2/26/07, Andrew
<andrewm...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > > >
> > > > > > > Hi,
> > > > > > > I''m currently running an
apache/jboss
> > > cocoon/flow/hibernate/ajax
> > > > > > > paypal (directpayment) project and am looking
into the
> > > possibility of
> > > > > > > porting it across to ruby/rails. For that
reason I would like
> > > to know
> > > > > > > the following:
> > > >
> > > > > > > 1. Can I call my java classes or would I be
looking at a
> > > complete
> > > > > > > rewrite in ruby?
> > > > > > > 2. How effective is ruby in terms of
seperation of concerns
> > > regarding
> > > > > > > design from content?
> > > > > > > 3. I have a number of hibernate maps
accessing various
> > > postgresql
> > > > > > > tables. Can I reverse engineer those tables
into rails (maps?)
> > > ?
> > > > > > > 4. In cocoons mvc (flowscript) it is possible
to instantiate
> > > and call
> > > > > > > class methods from within the document at the
same time as
> > > directing
> > > > > > > flow. Is this possible in ruby/rails?
> > > >
> > > > > > > --
> > > > > > > Regards
> > > >
> > > > > > > Andrew
> > >
> > >
> > >
> > >
> > >
> >
> >
> >
>
> >
>
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Hi Luke,
you are a diamond my friend!

All I need to know now is what is the best resource/documentation available
in terms of hooking together a ruby/rails/ajax/rjs/activerecord project? Is
there a ruby/rails/ajax/rjs/activerecord for dummies type publication
available?

One further question if I may, in terms of persisting an objet retrieved
from a dB table? Currently I retrieve the hibernate dB object and store it
in a session object. I take it that ruby/rails/activerecord would function
in much the same way?

I just came across some activerecord code:

class Order < ActiveRecord::Base
     has_many :items
end


That''s it?! One line of code to setup a one-to-many relationship
between an
order and order items table?!!! ;-)
--
Regards

Andrew

On 27/02/07, Luke Ivers
<technodolt-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
>
> OK! I am using hibernate with ehcache handling lazy object caching. Can
> > > anyone else confirm whether ActiveRecord supports
lazy-loading/object
> > > caching?
> > >
> >
> See my other message
>
>
> > > 1. Database.
> > > I am using postgreSQL 8.1 . Would rails be able to reverse
engineer
> > > the required ActiveRecord maps from the dB schema? From what I
understand of
> > > rails convention table names need to be pluralized. How would the
reverse
> > > engineering process handle the fact that none of my table names
are
> > > pluralized?!
> > >
> >
> Easy: you can tell your models specifically what table name to use, and it
> will just go ahead and use them.
> In essence, you create a model... say you have a person table, and you
> want a Person model.
> class Person < ActiveRecord::Base
>   set_table_name ''person''
> end
> This will still draw in all your fields automatically and create accessors
> for them and etc... one other want to consider is the id field... Rails
> wants it to be named just flat out ''id'', but a lot of
people do something
> like ''person_id''... you can use set_id_field
>
> 2. Form validation
> > > I am using Ajax to handle all form validation in cocoon. In
cocoon
> > > form dev/validation would be handled by:
> > >
> > > a. Specifying that you wish Ajax to handle validation as so:
> > >
> > > <ft:form-template action=" login.kont"
name="Form1" method="POST"
> > > ajax="true">
> > >
> > > b.  Defining your form widgets in a seperate document as so:
> > >                                   <ft:widget
id="password">
> > >                                       <fi:styling
size="30"
> > > type="password" class="keyinbox"
style="background-color:#C9C4BD;" />
> > >                                   </ft:widget>
> > >
> > > c. Defining your validation, against your widgest, in another
document
> > > as so:
> > >
> > >          <fd:field id="password"
required="true">
> > >           <fd:datatype base="string"/>
> > >           <fd:validation>
> > >             <fd:length min="5"
max="20"/>
> > >           </fd:validation>
> > >          </fd:field>
> > >
> >
> Ajax + Rails = super, super, super easy.
>
> 3. Paypal API.
> > >
> > > I have recently come across a ruby/rails Paypal (directpayment
api) so
> > > this area is covered.
> > >
> >
> Definitely look into Active Merchant: it does Paypal and a TON of other
> stuff... so if you switch, you''re still covered.
>
> 4. Image handling.
> > >
> > > All artist images are stored in postgresql and read into the
webapp as
> > > svg via Base64. Cocoon then allows for an svgTOpng or svgTOjpeg
conversion
> > > before the image is rendered to the page. As an example I have
various img
> > > calls defined as such:
> > >
> > > <image
src="artistImage/${artistID}/228/202/${stock_code}.svg"
> > > alt="${artist_name} - ${track_title}"/>
> > >
> > > So in effect the img tag is making a call to the database which
in
> > > turn return the appropriate binary information, holds it in svg
format
> > > before converting it to either PNG or JPEG. How would ruby/rails
handle
> > > this?
> > >
> >
> You completely got me on this one... I''m sure it''s
probably possible, but
> I don''t have a clue.
>
> 5. Email/Zip
> > > I have a process where by the artist track files (mp3) a user may
have
> > > ordered are pulled out from their order/order_items object, read
in the file
> > > system directory and then zipped up. This zip is then emailed to
the user.
> > > How would ruby/rails handle this process?
> > >
> >
> ActionMailer is your friend...  ruby comes with standard zipping stuff
> built in, and ActionMailer is EXTREMELY easy to use to mail.
>
> --
> > > Regards
> > >
> > > Andrew
> > >
> > >
> > >
> > >
>
> >
>
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On 2/28/07, Andrew Madu
<andrewmadu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> Hi Luke,
> you are a diamond my friend!
>
> All I need to know now is what is the best resource/documentation available
> in terms of hooking together a
> ruby/rails/ajax/rjs/activerecord project? Is there a
> ruby/rails/ajax/rjs/activerecord for dummies type
> publication available?
>
You''ll want the Agile Web Development with Rails book from the
Pragmatic Programmers. IT covers all the technologies plus a lot more
and also contains a very useful reference to the rails framework.

--max
> One further question if I may, in terms of persisting an objet retrieved
> from a dB table? Currently I retrieve the hibernate dB object and store it
> in a session object. I take it that ruby/rails/activerecord would function
> in much the same way?
>
Yes, you can do that. However it''s of course better pracice not to
store any application state (even temporary) in the session.
> I just came across some activerecord code:
>
> class Order < ActiveRecord::Base
>  has_many :items
> end
>
> That''s it?! One line of code to setup a one-to-many relationship
between an
> order and order items table?!!! ;-)
Yes! And if you like that one, wait until you find out about the
really cool stuff ;)

--max

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>  That''s it?! One line of code to setup a one-to-many relationship
between an order and order items table?!!! ;-)  
 
You''d probably also want another line of code to do the other half of
the mapping:
 
class Item < ActiveRecord::Base
  belongs_to :order
end
 
So, two lines of code. Terrible, ennit.
 
- donald

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Hi Max,

> You''ll want the Agile Web Development with Rails book from the
> Pragmatic Programmers. IT covers all the technologies plus a lot more
> and also contains a very useful reference to the rails framework.

thanks for that recommendation. I will look it up.

--
Regards

Andrew

--max
>
> > One further question if I may, in terms of persisting an objet
retrieved
> > from a dB table? Currently I retrieve the hibernate dB object and
store
> it
> > in a session object. I take it that ruby/rails/activerecord would
> function
> > in much the same way?
> >
>
> Yes, you can do that. However it''s of course better pracice not to
> store any application state (even temporary) in the session.
>
> > I just came across some activerecord code:
> >
> > class Order < ActiveRecord::Base
> >  has_many :items
> > end
> >
> > That''s it?! One line of code to setup a one-to-many
relationship between
> an
> > order and order items table?!!! ;-)
>
> Yes! And if you like that one, wait until you find out about the
> really cool stuff ;)
>
> --max
>
> >
>
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Hi Donald,

> class Item < ActiveRecord::Base
>   belongs_to :order
> end
>

Stop it! When I think how long it took me before I got a handle on hibernate
map/classes!!!

2 lines?! It''s just not right!!! ;-)

--
Regards

Andrew

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I love that everyone moving from a different framework (with the possible
exception of things like Django) has these moments: the "oh my god
it''s so
easy" ones.

You want to see something freaking _amazing_?
This is code I wrote on this list the other day, and it just flipped my lid
that it was so easy to do this.
Say you want a tree of categories. such that you have a parent with multiple
children, who can have multiple children, etc.

First, if you want the super easy route, do this
class Category < ActiveRecord::Base
  acts_as_tree
end

and put the field "parent_id" in your table... and you''re
done.
You can then do
category.children
category.children.parent
childcategory.siblings
etc, etc.

If you want to roll your own, it''s one more line (of course, this
doesn''t
give you all the fancy extra functions)

class Category < ActiveRecord::Base
  belongs_to :parent, class_name => ''Category'', foreign_key
=> ''parent_id''
  has_many :sub_categories, class_name => ''Category'',
foreign_key =>
''parent_id''
end

Done... you can now do:
category.sub_categories
childcategory.parent
childcategory.parent.sub_categories - self (returns siblings)

Amazing, eh?

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On 2/28/07, Luke Ivers
<technodolt-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> I love that everyone moving from a different framework (with the possible
> exception of things like Django) has these moments: the "oh my god
it''s so
> easy" ones.
>
I also like the two-line ajax autocompletion:

in the view:

<%= autto_complete_field :user, :name %>

in the controller:

auto_complete_for :user, :name

Done.

Some of the plugins do amazing things too, such as acts_as_versioned.
One line of code to get a complete versioned history of every update
to a model, complete with rollback to a previous version. The code?

class WikiPage << ActiveRecord::Base
  acts_as_versioned
end

and then

wiki_page.revert_to(wiki_page.version-1)  # get previous version

;)

--max

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On Feb 27, 2007, at 10:02 AM, Andrew Madu wrote:
> Yes, I agree whole heartedly! I''m just trying to ascertain what  
> what technology within the ruby/rails framework will allow me to  
> achieve the same functionality as I currently have with the cocoon/ 
> hibernate framework
there is no equivalent to the Cocoon flowscript (with the  
continuations and all).. not that its a blocker, just be aware that  
coding forms is different :)

-pete


-- 
(peter.royal|osi)@pobox.com - http://fotap.org/~osi

On Feb 27, 9:18 pm, "Luke Ivers"
<technod...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> I love that everyone moving from a different framework (with the possible
> exception of things like Django) has these moments: the "oh my god
it''s so
> easy" ones.
Yeah. I was excited when EJB3 came out after years of EJB2/xDoclet.
Now, I won''t even consider working on anything except RoR. Unless, I
get paid enough, of course. ;-)

> You want to see something freaking _amazing_?
> This is code I wrote on this list the other day, and it just flipped my lid
> that it was so easy to do this.
> Say you want a tree of categories. such that you have a parent with
multiple
> children, who can have multiple children, etc.
>
> First, if you want the super easy route, do this
> class Category < ActiveRecord::Base
>   acts_as_tree
> end
>
> and put the field "parent_id" in your table... and
you''re done.
> You can then do
> category.children
> category.children.parent
> childcategory.siblings
> etc, etc.
>
> If you want to roll your own, it''s one more line (of course, this
doesn''t
> give you all the fancy extra functions)
>
> class Category < ActiveRecord::Base
>   belongs_to :parent, class_name => ''Category'',
foreign_key => ''parent_id''
>   has_many :sub_categories, class_name => ''Category'',
foreign_key =>
> ''parent_id''
> end
>
> Done... you can now do:
> category.sub_categories
> childcategory.parent
> childcategory.parent.sub_categories - self (returns siblings)
>
> Amazing, eh?
That is very cool. I have a similar thing in the app I am working on
now, I am going to give that a whirl. Thanks!




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-~----------~----~----~----~------~----~------~--~---

Hi,
does the postgres-pr interface support SSL and if so is it set to support
SSL by default or do I need to configure a ruby/rails document to activate
it?

--
Regards

Andrew

On 28/02/07, Scott <tamosunas-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
>
>
>
>
> On Feb 27, 9:18 pm, "Luke Ivers"
<technod...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > I love that everyone moving from a different framework (with the
> possible
> > exception of things like Django) has these moments: the "oh my
god it''s
> so
> > easy" ones.
>
> Yeah. I was excited when EJB3 came out after years of EJB2/xDoclet.
> Now, I won''t even consider working on anything except RoR. Unless,
I
> get paid enough, of course. ;-)
>
>
> > You want to see something freaking _amazing_?
> > This is code I wrote on this list the other day, and it just flipped
my
> lid
> > that it was so easy to do this.
> > Say you want a tree of categories. such that you have a parent with
> multiple
> > children, who can have multiple children, etc.
> >
> > First, if you want the super easy route, do this
> > class Category < ActiveRecord::Base
> >   acts_as_tree
> > end
> >
> > and put the field "parent_id" in your table... and
you''re done.
> > You can then do
> > category.children
> > category.children.parent
> > childcategory.siblings
> > etc, etc.
> >
> > If you want to roll your own, it''s one more line (of course,
this
> doesn''t
> > give you all the fancy extra functions)
> >
> > class Category < ActiveRecord::Base
> >   belongs_to :parent, class_name => ''Category'',
foreign_key =>
> ''parent_id''
> >   has_many :sub_categories, class_name =>
''Category'', foreign_key =>
> > ''parent_id''
> > end
> >
> > Done... you can now do:
> > category.sub_categories
> > childcategory.parent
> > childcategory.parent.sub_categories - self (returns siblings)
> >
> > Amazing, eh?
>
> That is very cool. I have a similar thing in the app I am working on
> now, I am going to give that a whirl. Thanks!
>
>
>
>
> >
>
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Hi,
I have just come across an article which states that primary keys must be
auto-increment and id(which I know can be overridden). So when I am dealing,
in hibernate, with the following:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping package="test">
    <class name="Artist" table="artisttbl"
lazy="false">
        <cache usage="read-write"/>
        <id name="ID" column="artist_id">
            <generator class="assigned"/>
        </id>
        <version name="Version" column="version"
type="integer"/>
        <property name="ArtistName" column="artist_name"
type="string"
not-null="true"/>
        <property name="ArtistInfo" column="artist_info"
type="string"
not-null="true"/>
        <property name="StockID" column="stock_id"
type="string"/>
        <property name="FeaturedArtist"
column="featured_artist"
type="boolean" not-null="true"/>
        <set name="ArtistImages" inverse="true"
lazy="true"
cascade="all-delete-orphan">
            <cache usage="read-write"/>
            <key column="artist_id"/>
            <one-to-many class="ArtistImages"/>
        </set>
    </class>
</hibernate-mapping>

which basically says that the primary id is ''assigned'' and
mapped to the
artist_id column of the artisttbl with a one to many relationship against
the artistimagestbl, the artist_id being the Foreign key, how would this be
reflect in ActiveRecord? The database schema alraeady exists, I just want to
see how ruby/rails/activerecord would reflect this in actual code.

What actual rails/activerecord command would be needed to say ''go away
to
this dB and create all the required activrecord classes based on the dB
schema?

--
Regards

Andrew



On 28/02/07, Andrew Madu
<andrewmadu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
>
> Hi,
> does the postgres-pr interface support SSL and if so is it set to support
> SSL by default or do I need to configure a ruby/rails document to activate
> it?
>
> --
> Regards
>
> Andrew
>
> On 28/02/07, Scott
<tamosunas-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> >
> >
> >
> >
> > On Feb 27, 9:18 pm, "Luke Ivers"
<technod...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > > I love that everyone moving from a different framework (with the
> > possible
> > > exception of things like Django) has these moments: the "oh
my god
> > it''s so
> > > easy" ones.
> >
> > Yeah. I was excited when EJB3 came out after years of EJB2/xDoclet.
> > Now, I won''t even consider working on anything except RoR.
Unless, I
> > get paid enough, of course. ;-)
> >
> >
> > > You want to see something freaking _amazing_?
> > > This is code I wrote on this list the other day, and it just
flipped
> > my lid
> > > that it was so easy to do this.
> > > Say you want a tree of categories. such that you have a parent
with
> > multiple
> > > children, who can have multiple children, etc.
> > >
> > > First, if you want the super easy route, do this
> > > class Category < ActiveRecord::Base
> > >   acts_as_tree
> > > end
> > >
> > > and put the field "parent_id" in your table... and
you''re done.
> > > You can then do
> > > category.children
> > > category.children.parent
> > > childcategory.siblings
> > > etc, etc.
> > >
> > > If you want to roll your own, it''s one more line (of
course, this
> > doesn''t
> > > give you all the fancy extra functions)
> > >
> > > class Category < ActiveRecord::Base
> > >   belongs_to :parent, class_name =>
''Category'', foreign_key =>
> > ''parent_id''
> > >   has_many :sub_categories, class_name =>
''Category'', foreign_key =>
> > > ''parent_id''
> > > end
> > >
> > > Done... you can now do:
> > > category.sub_categories
> > > childcategory.parent
> > > childcategory.parent.sub_categories - self (returns siblings)
> > >
> > > Amazing, eh?
> >
> > That is very cool. I have a similar thing in the app I am working on
> > now, I am going to give that a whirl. Thanks!
> >
> >
> >
> >
> > > >
> >
>
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
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-~----------~----~----~----~------~----~------~--~---

Hi,
No worries with this one guys. I have a handle on this now.

I would still like to know how to ensure that a primary key can be
''assigned''. The following code would associate an
auto_increment key
correct?:

class Usertbl < ActiveRecord::Base
    set_primary_key "user_id"
end

So how do I make the primary key assignable?

--
Regards

Andrew

On 28/02/07, Andrew Madu
<andrewmadu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
>
> Hi,
> I have just come across an article which states that primary keys must be
> auto-increment and id(which I know can be overridden). So when I am
dealing,
> in hibernate, with the following:
>
> <?xml version=" 1.0" encoding="UTF-8"?>
> <!DOCTYPE hibernate-mapping PUBLIC
>     "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
>     "
http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
>
> <hibernate-mapping package="test">
>     <class name="Artist" table="artisttbl"
lazy="false">
>         <cache usage="read-write"/>
>         <id name="ID" column="artist_id">
>             <generator class="assigned"/>
>         </id>
>         <version name="Version" column="version"
type="integer"/>
>         <property name="ArtistName"
column="artist_name" type="string"
> not-null="true"/>
>         <property name="ArtistInfo"
column="artist_info" type="string"
> not-null="true"/>
>         <property name="StockID" column="stock_id"
type="string"/>
>         <property name="FeaturedArtist"
column="featured_artist"
> type="boolean" not-null="true"/>
>         <set name="ArtistImages" inverse="true"
lazy="true"
> cascade="all-delete-orphan">
>             <cache usage="read-write"/>
>             <key column="artist_id"/>
>             <one-to-many class="ArtistImages"/>
>         </set>
>     </class>
> </hibernate-mapping>
>
> which basically says that the primary id is ''assigned''
and mapped to the
> artist_id column of the artisttbl with a one to many relationship against
> the artistimagestbl, the artist_id being the Foreign key, how would this be
> reflect in ActiveRecord? The database schema alraeady exists, I just want
to
> see how ruby/rails/activerecord would reflect this in actual code.
>
> What actual rails/activerecord command would be needed to say ''go
away to
> this dB and create all the required activrecord classes based on the dB
> schema?
>
> --
> Regards
>
> Andrew
>
>
>
> On 28/02/07, Andrew Madu
<andrewmadu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> >
> > Hi,
> > does the postgres-pr interface support SSL and if so is it set to
> > support SSL by default or do I need to configure a ruby/rails document
to
> > activate it?
> >
> > --
> > Regards
> >
> > Andrew
> >
> > On 28/02/07, Scott
<tamosunas-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > >
> > >
> > >
> > >
> > > On Feb 27, 9:18 pm, "Luke Ivers"
<technod...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > > > I love that everyone moving from a different framework (with
the
> > > possible
> > > > exception of things like Django) has these moments: the
"oh my god
> > > it''s so
> > > > easy" ones.
> > >
> > > Yeah. I was excited when EJB3 came out after years of
EJB2/xDoclet.
> > > Now, I won''t even consider working on anything except
RoR. Unless, I
> > > get paid enough, of course. ;-)
> > >
> > >
> > > > You want to see something freaking _amazing_?
> > > > This is code I wrote on this list the other day, and it just
flipped
> > > my lid
> > > > that it was so easy to do this.
> > > > Say you want a tree of categories. such that you have a
parent with
> > > multiple
> > > > children, who can have multiple children, etc.
> > > >
> > > > First, if you want the super easy route, do this
> > > > class Category < ActiveRecord::Base
> > > >   acts_as_tree
> > > > end
> > > >
> > > > and put the field "parent_id" in your table... and
you''re done.
> > > > You can then do
> > > > category.children
> > > > category.children.parent
> > > > childcategory.siblings
> > > > etc, etc.
> > > >
> > > > If you want to roll your own, it''s one more line
(of course, this
> > > doesn''t
> > > > give you all the fancy extra functions)
> > > >
> > > > class Category < ActiveRecord::Base
> > > >   belongs_to :parent, class_name =>
''Category'', foreign_key =>
> > > ''parent_id''
> > > >   has_many :sub_categories, class_name =>
''Category'', foreign_key =>
> > >
> > > > ''parent_id''
> > > > end
> > > >
> > > > Done... you can now do:
> > > > category.sub_categories
> > > > childcategory.parent
> > > > childcategory.parent.sub_categories - self (returns
siblings)
> > > >
> > > > Amazing, eh?
> > >
> > > That is very cool. I have a similar thing in the app I am working
on
> > > now, I am going to give that a whirl. Thanks!
> > >
> > >
> > >
> > >
> > > > > >
> > >
> >
>
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
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-~----------~----~----~----~------~----~------~--~---

Assignable meaning not auto_increment and you take care of the value
yourself? ActiveRecord doesn''t really like that. It basically requires
that
it take care of handling the primary key. I''m not sure if
there''s a plugin
to work around this, but you''ll probably have to jump into AR itself if
you
start getting crazy with the keys.

Unless of course someone knows a proper way of doing this.

Jason

On 3/1/07, Andrew Madu
<andrewmadu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
>
> Hi,
> No worries with this one guys. I have a handle on this now.
>
> I would still like to know how to ensure that a primary key can be
> ''assigned''. The following code would associate an
auto_increment key
> correct?:
>
> class Usertbl < ActiveRecord::Base
>     set_primary_key "user_id"
> end
>
> So how do I make the primary key assignable?
>
> --
> Regards
>
> Andrew
>
> On 28/02/07, Andrew Madu
<andrewmadu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> >
> > Hi,
> > I have just come across an article which states that primary keys must
> > be auto-increment and id(which I know can be overridden). So when I am
> > dealing, in hibernate, with the following:
> >
> > <?xml version=" 1.0" encoding="UTF-8"?>
> > <!DOCTYPE hibernate-mapping PUBLIC
> >     "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
> >     "
http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
> >
> > <hibernate-mapping package="test">
> >     <class name="Artist" table="artisttbl"
lazy="false">
> >         <cache usage="read-write"/>
> >         <id name="ID" column="artist_id">
> >             <generator class="assigned"/>
> >         </id>
> >         <version name="Version"
column="version" type="integer"/>
> >         <property name="ArtistName"
column="artist_name" type="string"
> > not-null="true"/>
> >         <property name="ArtistInfo"
column="artist_info" type="string"
> > not-null="true"/>
> >         <property name="StockID"
column="stock_id" type="string"/>
> >         <property name="FeaturedArtist"
column="featured_artist"
> > type="boolean" not-null="true"/>
> >         <set name="ArtistImages" inverse="true"
lazy="true"
> > cascade="all-delete-orphan">
> >             <cache usage="read-write"/>
> >             <key column="artist_id"/>
> >             <one-to-many class="ArtistImages"/>
> >         </set>
> >     </class>
> > </hibernate-mapping>
> >
> > which basically says that the primary id is
''assigned'' and mapped to the
> > artist_id column of the artisttbl with a one to many relationship
against
> > the artistimagestbl, the artist_id being the Foreign key, how would
this be
> > reflect in ActiveRecord? The database schema alraeady exists, I just
want to
> > see how ruby/rails/activerecord would reflect this in actual code.
> >
> > What actual rails/activerecord command would be needed to say
''go away
> > to this dB and create all the required activrecord classes based on
the dB
> > schema?
> >
> > --
> > Regards
> >
> > Andrew
> >
> >
> >
> > On 28/02/07, Andrew Madu
<andrewmadu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org > wrote:
> > >
> > > Hi,
> > > does the postgres-pr interface support SSL and if so is it set to
> > > support SSL by default or do I need to configure a ruby/rails
document to
> > > activate it?
> > >
> > > --
> > > Regards
> > >
> > > Andrew
> > >
> > > On 28/02/07, Scott
<tamosunas-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > > >
> > > >
> > > >
> > > >
> > > > On Feb 27, 9:18 pm, "Luke Ivers"
<technod...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > > > > I love that everyone moving from a different framework
(with the
> > > > possible
> > > > > exception of things like Django) has these moments: the
"oh my god
> > > > it''s so
> > > > > easy" ones.
> > > >
> > > > Yeah. I was excited when EJB3 came out after years of
EJB2/xDoclet.
> > > > Now, I won''t even consider working on anything
except RoR. Unless, I
> > > > get paid enough, of course. ;-)
> > > >
> > > >
> > > > > You want to see something freaking _amazing_?
> > > > > This is code I wrote on this list the other day, and it
just
> > > > flipped my lid
> > > > > that it was so easy to do this.
> > > > > Say you want a tree of categories. such that you have a
parent
> > > > with multiple
> > > > > children, who can have multiple children, etc.
> > > > >
> > > > > First, if you want the super easy route, do this
> > > > > class Category < ActiveRecord::Base
> > > > >   acts_as_tree
> > > > > end
> > > > >
> > > > > and put the field "parent_id" in your
table... and you''re done.
> > > > > You can then do
> > > > > category.children
> > > > > category.children.parent
> > > > > childcategory.siblings
> > > > > etc, etc.
> > > > >
> > > > > If you want to roll your own, it''s one more
line (of course, this
> > > > doesn''t
> > > > > give you all the fancy extra functions)
> > > > >
> > > > > class Category < ActiveRecord::Base
> > > > >   belongs_to :parent, class_name =>
''Category'', foreign_key =>
> > > > ''parent_id''
> > > > >   has_many :sub_categories, class_name =>
''Category'', foreign_key
> > > > =>
> > > > > ''parent_id''
> > > > > end
> > > > >
> > > > > Done... you can now do:
> > > > > category.sub_categories
> > > > > childcategory.parent
> > > > > childcategory.parent.sub_categories - self (returns
siblings)
> > > > >
> > > > > Amazing, eh?
> > > >
> > > > That is very cool. I have a similar thing in the app I am
working on
> > > > now, I am going to give that a whirl. Thanks!
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > >
> >
>
> >
>
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
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rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
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Hi Jason,


Assignable meaning not auto_increment and you take care of the
value
> yourself?


Yes.

ActiveRecord doesn''t really like that. It basically requires that it
take
> care of handling the primary key.


Hmmm...not so good! Let''s say you have an order object with
corresponding
order items FKey referenced by order_id. If the order table is auto
generating its own id and each order item is also doing the same...nothing
will work, plus I can''t change the table structure as it is needed by
another system!!!

I''m not sure if there''s a plugin to work around this, but
you''ll probably
> have to jump into AR itself if you start getting crazy with the keys.

AR? What''s that?

--
Regards

Andrew

Unless of course someone knows a proper way of doing
this.
>
> Jason
>
> On 3/1/07, Andrew Madu
<andrewmadu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org > wrote:
> >
> > Hi,
> > No worries with this one guys. I have a handle on this now.
> >
> > I would still like to know how to ensure that a primary key can be
> > ''assigned''. The following code would associate an
auto_increment key
> > correct?:
> >
> > class Usertbl < ActiveRecord::Base
> >     set_primary_key "user_id"
> > end
> >
> > So how do I make the primary key assignable?
> >
> > --
> > Regards
> >
> > Andrew
> >
> > On 28/02/07, Andrew Madu
<andrewmadu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > >
> > > Hi,
> > > I have just come across an article which states that primary keys
must
> > > be auto-increment and id(which I know can be overridden). So when
I am
> > > dealing, in hibernate, with the following:
> > >
> > > <?xml version=" 1.0" encoding="UTF-8"?>
> > > <!DOCTYPE hibernate-mapping PUBLIC
> > >     "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
> > >     "
http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
> > >
> > > <hibernate-mapping package="test">
> > >     <class name="Artist" table="artisttbl"
lazy="false">
> > >         <cache usage="read-write"/>
> > >         <id name="ID"
column="artist_id">
> > >             <generator class="assigned"/>
> > >         </id>
> > >         <version name="Version"
column="version" type="integer"/>
> > >         <property name="ArtistName"
column="artist_name" type="string"
> > > not-null="true"/>
> > >         <property name="ArtistInfo"
column="artist_info" type="string"
> > > not-null="true"/>
> > >         <property name="StockID"
column="stock_id" type="string"/>
> > >         <property name="FeaturedArtist"
column="featured_artist"
> > > type="boolean" not-null="true"/>
> > >         <set name="ArtistImages"
inverse="true" lazy="true"
> > > cascade="all-delete-orphan">
> > >             <cache usage="read-write"/>
> > >             <key column="artist_id"/>
> > >             <one-to-many class="ArtistImages"/>
> > >         </set>
> > >     </class>
> > > </hibernate-mapping>
> > >
> > > which basically says that the primary id is
''assigned'' and mapped to
> > > the artist_id column of the artisttbl with a one to many
relationship
> > > against the artistimagestbl, the artist_id being the Foreign key,
how would
> > > this be reflect in ActiveRecord? The database schema alraeady
exists, I just
> > > want to see how ruby/rails/activerecord would reflect this in
actual code.
> > >
> > > What actual rails/activerecord command would be needed to say
''go away
> > > to this dB and create all the required activrecord classes based
on the dB
> > > schema?
> > >
> > > --
> > > Regards
> > >
> > > Andrew
> > >
> > >
> > >
> > > On 28/02/07, Andrew Madu
<andrewmadu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org > wrote:
> > > >
> > > > Hi,
> > > > does the postgres-pr interface support SSL and if so is it
set to
> > > > support SSL by default or do I need to configure a
ruby/rails document to
> > > > activate it?
> > > >
> > > > --
> > > > Regards
> > > >
> > > > Andrew
> > > >
> > > > On 28/02/07, Scott
<tamosunas-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > On Feb 27, 9:18 pm, "Luke Ivers"
<technod...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > > > > > I love that everyone moving from a different
framework (with the
> > > > > possible
> > > > > > exception of things like Django) has these
moments: the "oh my
> > > > > god it''s so
> > > > > > easy" ones.
> > > > >
> > > > > Yeah. I was excited when EJB3 came out after years of
> > > > > EJB2/xDoclet.
> > > > > Now, I won''t even consider working on anything
except RoR. Unless,
> > > > > I
> > > > > get paid enough, of course. ;-)
> > > > >
> > > > >
> > > > > > You want to see something freaking _amazing_?
> > > > > > This is code I wrote on this list the other day,
and it just
> > > > > flipped my lid
> > > > > > that it was so easy to do this.
> > > > > > Say you want a tree of categories. such that you
have a parent
> > > > > with multiple
> > > > > > children, who can have multiple children, etc.
> > > > > >
> > > > > > First, if you want the super easy route, do this
> > > > > > class Category < ActiveRecord::Base
> > > > > >   acts_as_tree
> > > > > > end
> > > > > >
> > > > > > and put the field "parent_id" in your
table... and you''re done.
> > > > > > You can then do
> > > > > > category.children
> > > > > > category.children.parent
> > > > > > childcategory.siblings
> > > > > > etc, etc.
> > > > > >
> > > > > > If you want to roll your own, it''s one
more line (of course,
> > > > > this doesn''t
> > > > > > give you all the fancy extra functions)
> > > > > >
> > > > > > class Category < ActiveRecord::Base
> > > > > >   belongs_to :parent, class_name =>
''Category'', foreign_key =>
> > > > > ''parent_id''
> > > > > >   has_many :sub_categories, class_name =>
''Category'',
> > > > > foreign_key =>
> > > > > > ''parent_id''
> > > > > > end
> > > > > >
> > > > > > Done... you can now do:
> > > > > > category.sub_categories
> > > > > > childcategory.parent
> > > > > > childcategory.parent.sub_categories - self
(returns siblings)
> > > > > >
> > > > > > Amazing, eh?
> > > > >
> > > > > That is very cool. I have a similar thing in the app I
am working
> > > > > on
> > > > > now, I am going to give that a whirl. Thanks!
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > >
> > >
> >
> >
> >
>
> >
>
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On Mar 1, 9:26 am, "Andrew Madu"
<andrewm...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> Hmmm...not so good! Let''s say you have an order object with
corresponding
> order items FKey referenced by order_id. If the order table is auto
> generating its own id and each order item is also doing the same...nothing
> will work
This is a very standard, basic model setup. It will work just fine in
Rails. Generate models for order and order item, then add to order.rb:

  has_many  :order_items

add to order_item.rb

  belongs_to  :order

and Rails will work as you describe. The curious thing is why you
don''t trust Hibernate to perform id management for you? Are you doing
something unusual?


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