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Gerard

2006-Jan-05 12:48 UTC

[Rails] HOWTO: Combine fields from 2 two tables in 1 object

Hi all,

For a dropdownlist (showing "Company - FirstName Lastname'') I want
to fill an
object @project_contacts with "Name" from table Companies and
"Firstname" and
"Lastname" from table contacts. Any idea?

Regards,

Gerard.

-- 
"Who cares if it doesn''t do anything?  It was made with our new
Triple-Iso-Bifurcated-Krypton-Gate-MOS process ..."

My $Grtz =~ Gerard;
~
:wq!

Gerard

2006-Jan-05 13:23 UTC

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[Rails] HOWTO: Combine fields from 2 two tables in 1 object

Hi all,

Watery eyes ... Nevermind the previous. I don''t see that working for
me.

This is what I want. I create a new project, and want to copy some contact and 
company info into a project table.

I don''t see a link (selected via a view) between to completely seperate
tables. Let alone get data from one to the other.

Please help?

Gerard.

On Thursday 05 January 2006 13:49, Gerard tried to type something
like:> Hi all,
>
> For a dropdownlist (showing "Company - FirstName Lastname'') I
want to fill
> an object @project_contacts with "Name" from table Companies and
> "Firstname" and "Lastname" from table contacts. Any
idea?
>
> Regards,
>
> Gerard.
-- 
"Who cares if it doesn''t do anything?  It was made with our new
Triple-Iso-Bifurcated-Krypton-Gate-MOS process ..."

My $Grtz =~ Gerard;
~
:wq!

Chris Hall

2006-Jan-05 13:34 UTC

head link

[Rails] HOWTO: Combine fields from 2 two tables in 1 object

assuming certain relationships between projects/contacts/companies

projects (hm) <--> (bt) contacts (bt) <--> (hm) companies

controller:

@project.find(1)
@project_contacts = @project.contacts.collect { |c| [ c.company.name + " -
"
+ c.first_name + " " + c.last_name, c.id ] }
# @project_contacts => [ [ "Acme -Bob Smith", 1], ["MegaCorp -
Jane Doe",
2], ... ]

view:

<%= select("project", "contact_id", @project_contacts )
%>


On 1/5/06, Gerard <mailing@gp-net.nl> wrote:>
> Hi all,
>
> For a dropdownlist (showing "Company - FirstName Lastname'') I
want to fill
> an
> object @project_contacts with "Name" from table Companies and
"Firstname"
> and
> "Lastname" from table contacts. Any idea?
>
> Regards,
>
> Gerard.
>
> --
> "Who cares if it doesn''t do anything?  It was made with our
new
> Triple-Iso-Bifurcated-Krypton-Gate-MOS process ..."
>
> My $Grtz =~ Gerard;
> ~
> :wq!
>
>
>
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
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Gerard

2006-Jan-05 13:59 UTC

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[Rails] HOWTO: Combine fields from 2 two tables in 1 object

Chris,

Hurtfully I must state being a newbie can slow things down .. :-)

Cudo''s on your solution. It hits the nail on the head. Looking at your 
solution .. .would it be wise to buy the pragmatic ruby book. Or do I just 
need to keep going knowing I''ll get better?

Anyway ...> projects (hm) <--> (bt) contacts (bt) <--> (hm) companiesVery close. This is true:(bt) contacts (bt) <--> (hm) companies

And there is: projects (ho) <--> (bt) project_contacts

The reason is that when a contact resigns (is deleted) I still want to be able 
to view closed projects. Herewith avoiding the (for me) infamous
''nil''
errors.

Since there''s no relationship between projects & project_contacts
on one side
and contacts on the other.  Looks like I need to do a second object fill when 
saving the new project. I can then use the ''"c.id'' that
comes back from
@project_contacts and use that id to gather the info for storing it. Or is 
that info still avalaible in @project.contacts.collect ?

Thanx so much for helping me out.

Gerard
>
> controller:
>
> @project.find(1)
> @project_contacts = @project.contacts.collect { |c| [ c.company.name +
" -
> " + c.first_name + " " + c.last_name, c.id ] }
> # @project_contacts => [ [ "Acme -Bob Smith", 1],
["MegaCorp - Jane Doe",
> 2], ... ]
>
> view:
>
> <%= select("project", "contact_id",
@project_contacts ) %>
>
> On 1/5/06, Gerard <mailing@gp-net.nl> wrote:
> > Hi all,
> >
> > For a dropdownlist (showing "Company - FirstName
Lastname'') I want to
> > fill an
> > object @project_contacts with "Name" from table Companies
and "Firstname"
> > and
> > "Lastname" from table contacts. Any idea?
> >
> > Regards,
> >
> > Gerard.
> >
> > --
> > "Who cares if it doesn''t do anything?  It was made with
our new
> > Triple-Iso-Bifurcated-Krypton-Gate-MOS process ..."
> >
> > My $Grtz =~ Gerard;
> > ~
> >
> > :wq!
> >
> > _______________________________________________
> > Rails mailing list
> > Rails@lists.rubyonrails.org
> > http://lists.rubyonrails.org/mailman/listinfo/rails
-- 
"Who cares if it doesn''t do anything?  It was made with our new
Triple-Iso-Bifurcated-Krypton-Gate-MOS process ..."

My $Grtz =~ Gerard;
~
:wq!

Gerard

2006-Jan-06 11:31 UTC

head link

[Rails] HOWTO: Combine fields from 2 two tables in 1 object

Chris,

Having chewed on the line bewol some more

@project_contacts = @contacts_list.collect { |c| [ c.name + " - " + 
c.firstname + " " + c.lastname, c.id ] }

I do need the c.id in the end. but not displayed in the dropdownlist. And
it''s
shown like this now: "Company - FirstName Lastname3"
The "3" being the id of the contact. Do i need to fill the
@project_contacts
in a different way, or address the select statement data input in a different 
way? What would be your choice for ease of use?

Thanx,

Regards.

On Thursday 05 January 2006 14:34, Chris Hall tried to type something
like:> assuming certain relationships between projects/contacts/companies
>
> projects (hm) <--> (bt) contacts (bt) <--> (hm) companies
>
> controller:
>
> @project.find(1)
> @project_contacts = @project.contacts.collect { |c| [ c.company.name +
" -
> " + c.first_name + " " + c.last_name, c.id ] }
> # @project_contacts => [ [ "Acme -Bob Smith", 1],
["MegaCorp - Jane Doe",
> 2], ... ]
>
> view:
>
> <%= select("project", "contact_id",
@project_contacts ) %>
>
> On 1/5/06, Gerard <mailing@gp-net.nl> wrote:
> > Hi all,
> >
> > For a dropdownlist (showing "Company - FirstName
Lastname'') I want to
> > fill an
> > object @project_contacts with "Name" from table Companies
and "Firstname"
> > and
> > "Lastname" from table contacts. Any idea?
> >
> > Regards,
> >
> > Gerard.
> >
> > --
> > "Who cares if it doesn''t do anything?  It was made with
our new
> > Triple-Iso-Bifurcated-Krypton-Gate-MOS process ..."
> >
> > My $Grtz =~ Gerard;
> > ~
> >
> > :wq!
> >
> > _______________________________________________
> > Rails mailing list
> > Rails@lists.rubyonrails.org
> > http://lists.rubyonrails.org/mailman/listinfo/rails
-- 
"Who cares if it doesn''t do anything?  It was made with our new
Triple-Iso-Bifurcated-Krypton-Gate-MOS process ..."

My $Grtz =~ Gerard;
~
:wq!

Gerard

2006-Jan-08 10:26 UTC

head link

[Rails] HOWTO: Combine fields from 2 two tables in 1 object

Hi Chris,

After a lot of ruby studying (and some frustration whilest not going fast 
enough .. :-) I cleaned up my code somewhat and all seems better and makes 
more sence now. I was wondering if you could do me one (no guarantees though) 
more favour on the code:

Controller:
@project = Project.new

@contacts_list = Contact.find_by_sql(''select t1.name, t2.firstname, 
t2.lastname, t2.id from companies AS t1, contacts AS t2 where t1.id = 
t2.company_id order by t1.name'')

@contacts_list = @contacts_list.collect { |c| [ c.id, c.name + " - " +
c.firstname + " " + c.lastname ] }

View (new_project):
# This one makes sence, However it comes up with an empty list.
<!-- %= select_tag "id", @contacts_list % -->

# This one works and shows a list of "company - contacts
<%= collection_select("contacts", "id", @contacts_list,
:id, "collect",
{ :include_blank => true } )    

Based on the id from the contact dropdown list I want to copy contact info 
from the Contact model to the ProjectContact model when invoking 
"create_project".

Can you give me a pointer on how to dig up (debug) what info is availarble on 
form submission?

Thanx again.



On Friday 06 January 2006 14:32, your brain produced:> actually, i screwed up the example, as project has_many contacts, therefore
> there is no contact_id in projects table.  so the <%= select
"project",
> "contact_id", ... %> example is erroneous.
>
> what you probably want is
>
> controller:
> @project = Project.find(1, :include => :contacts)
> @contacts_for_select = options_for_select(@project.contacts.collect { |c| [
> c.company.name + " - " + c.f_name + " " + c.l_name,
c.id ] })
>
> view:
> **<%= select_tag "contact_id", @contacts_for_select %>
>
> this will give you params[:contact_id] when you submit the form
>
> sorry about the confusion
>
> Chris
>
> On 1/6/06, Gerard <mailing@gp-net.nl> wrote:
> > Chris,
> >
> > Having chewed on the line bewol some more
> >
> > @project_contacts = @contacts_list.collect { |c| [ c.name + " -
" +
> > c.firstname + " " + c.lastname, c.id ] }
> >
> > I do need the c.id in the end. but not displayed in the dropdownlist.
And
> > it''s
> > shown like this now: "Company - FirstName Lastname3"
> > The "3" being the id of the contact. Do i need to fill the
> > @project_contacts
> > in a different way, or address the select statement data input in a
> > different
> > way? What would be your choice for ease of use?
> >
> > Thanx,
> >
> > Regards.
> >
> > On Thursday 05 January 2006 14:34, Chris Hall tried to type something
> >
> > like:
> > > assuming certain relationships between
projects/contacts/companies
> > >
> > > projects (hm) <--> (bt) contacts (bt) <--> (hm)
companies
> > >
> > > controller:
> > >
> > > @project.find(1)
> > > @project_contacts = @project.contacts.collect { |c| [
c.company.name +
> > > "
> >
> > -
> >
> > > " + c.first_name + " " + c.last_name, c.id ] }
> > > # @project_contacts => [ [ "Acme -Bob Smith", 1],
["MegaCorp - Jane
> >
> > Doe",
> >
> > > 2], ... ]
> > >
> > > view:
> > >
> > > <%= select("project", "contact_id",
@project_contacts ) %>
> > >
> > > On 1/5/06, Gerard <mailing@gp-net.nl> wrote:
> > > > Hi all,
> > > >
> > > > For a dropdownlist (showing "Company - FirstName
Lastname'') I want to
> > > > fill an
> > > > object @project_contacts with "Name" from table
Companies and
> >
> > "Firstname"
> >
> > > > and
> > > > "Lastname" from table contacts. Any idea?
> > > >
> > > > Regards,
> > > >
> > > > Gerard.
> > > >
> > > > --
> > > > "Who cares if it doesn''t do anything?  It was
made with our new
> > > > Triple-Iso-Bifurcated-Krypton-Gate-MOS process ..."
> > > >
> > > > My $Grtz =~ Gerard;
> > > > ~
> > > >
> > > > :wq!
> > > >
> > > > _______________________________________________
> > > > Rails mailing list
> > > > Rails@lists.rubyonrails.org
> > > > http://lists.rubyonrails.org/mailman/listinfo/rails
> >
> > --
> > "Who cares if it doesn''t do anything?  It was made with
our new
> > Triple-Iso-Bifurcated-Krypton-Gate-MOS process ..."
> >
> > My $Grtz =~ Gerard;
> > ~
> >
> > :wq!
-- 
"Who cares if it doesn''t do anything?  It was made with our new
Triple-Iso-Bifurcated-Krypton-Gate-MOS process ..."

My $Grtz =~ Gerard;
~
:wq!

Saiho Yuen

2006-Jan-13 15:34 UTC

head link

[Rails] How to disconnect to a database????

Hi, 

We have experienced some problems with
ActiveRecord::Base class of Ruby-Rails. We are
building a web-application based on the Ruby-rails
framework and the web-application needs to access to
difference databases, so we do not pre-define our
database accesses in the database.yml file. In fact,
we are using the
ActiveRecord::Base.establish_connection() to connect
to our database, the function works perfectly.
However, while we try to disconnect our database
connection with
ActiveRecord::Base.remove_connection(), we find out
that the connection is not closed (the function seems
not to be working perfectly) and we are still
connected to the database and able to access to the
tables.

Can you please tell us, is there something we did
wrong? or it is a known problem?
and what should we do to disconnect a database
connection ?

The using version ruby-rails are :
Rails 0.14.2 and ruby 1.8.3 (2005-09-21)
[x86_64-linux]
We are running on Linux KDE 3.4, and our database
engine is postgresql

The following is a code example:
####################################################################################

class GenTableAs < ActiveRecord::Base
end

class GentestController < ApplicationController

	def index	
		GenTableAs.establish_connection(:adapter =>
"postgresql",
						:host => "1.2.3.4",
						:port => 5432,	
						:database => "gendb", 
						:username => "dbuser", 
						:password => "dbuser")
		@connected1 = GenTableAs.connection()
		@removedConnection = GenTableAs.remove_connection()
		
		@connected2 = GenTableAs.connection() # should be
nil here
		obj1 = GenTableAs.new
		obj1["colaa"] = 100
		obj1["colab"] = "100"
		obj1.save	# should have raised exception or error
here
	end
end
####################################################################################
the output of index


@connected1: 

#<ActiveRecord::ConnectionAdapters::PostgreSQLAdapter:0x2aaaac138930
@runtime=0.0189187526702881,
@connection=#<PGconn:0x2aaaac138980>,
@logger=#<Logger:0x2aaaac2e7fd8
@default_formatter=#<Logger::Formatter:0x2aaaac2e7dd0
@datetime_format=nil>, @progname=nil,
@logdev=#<Logger::LogDevice:0x2aaaac2e7ce0
@shift_size=1048576, @shift_age=0,
@filename="./log/development.log",
@mutex=#<Logger::LogDevice::LogDeviceMutex:0x2aaaac2e7c90
@mon_waiting_queue=[], @mon_entering_queue=[],
@mon_count=0, @mon_owner=nil>,
@dev=#<File:./log/development.log>>, @level=0,
@formatter=nil>>

removed connection:

:password: dbuser
:database: gendb
:host: 1.2.3.4
:port: 5432
:adapter: postgresql
:username: dbuser


@connected2: 

#<ActiveRecord::ConnectionAdapters::PostgreSQLAdapter:0x2aaaac138930
@runtime=0.0189187526702881,
@connection=#<PGconn:0x2aaaac138980>,
@logger=#<Logger:0x2aaaac2e7fd8
@default_formatter=#<Logger::Formatter:0x2aaaac2e7dd0
@datetime_format=nil>, @progname=nil,
@logdev=#<Logger::LogDevice:0x2aaaac2e7ce0
@shift_size=1048576, @shift_age=0,
@filename="./log/development.log",
@mutex=#<Logger::LogDevice::LogDeviceMutex:0x2aaaac2e7c90
@mon_waiting_queue=[], @mon_entering_queue=[],
@mon_count=0, @mon_owner=nil>,
@dev=#<File:./log/development.log>>, @level=0,
@formatter=nil>>


Thanks you very much !!!!

Saiho

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Saiho Yuen

2006-Jan-16 16:20 UTC

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[Rails] Database connection-disconnection, when, where and how????

Hi, 

I wish to know where and when exactly the rails
connects to a database when we create a subclass of
ActiveReocrd::base ? And How ActiveRecord::base work
exactly? 

I took a look on the classes ConnectionSpecification,
PostgreSQLAdapter(we are using Postgresql) and
AbstractAdapter. I cannot figure out function calling
stack. Can someone can tell me how the all these
functions is called?

As I understand the connections is stored in the
@@defined_connections od the class
ConnectionSpecification. And when we "remove" the
connection, the function "remove connection" only
remove the connection from the variable
@@defined_connections, but it does not "disconnect"
the connection between rails and the database, So I
wonder when the rails connects to the database, and
when rails decides to disconnect, and how it is done?

Thanks you very much

Saiho




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