Rails - Feb 2008 - Why do I get an empty class when I run ruby script/generate scaffold?

I''ve been trying to figure this out since yesterday afternoon with no
success. I''ve tried to run ruby with oracle, 11, 10, and as of today
10g XE. The problem is obviously not on the oracle side because I can
query the database successfully using the command-line ruby exec
command.

But after I created an a simple ruby application with a simple
database table called emails that contains only one column called
email, running the generate scaffold command leaves me with an empty
class in email.rb:

class Email < ActiveRecord::Base
end

Isn''t it supposed to populate the class with the database column
information?

The generate command completed successfully with no errors. I''m
totally lost at this point. Any pointers would be greatly appreciated.
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The model''s not supposed to populate with anything.  The connections
are made in ActiveRecord behind the scenes. However, if you created a
scaffold, there should be some new files in the app/views/emails
directory if you had any columns in your table.

On Feb 9, 12:18 am, lxp149
<luying....-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> I''ve been trying to figure this out since yesterday afternoon with
no
> success. I''ve tried to run ruby with oracle, 11, 10, and as of
today
> 10g XE. The problem is obviously not on the oracle side because I can
> query the database successfully using the command-line ruby exec
> command.
>
> But after I created an a simple ruby application with a simple
> database table called emails that contains only one column called
> email, running the generate scaffold command leaves me with an empty
> class in email.rb:
>
> class Email < ActiveRecord::Base
> end
>
> Isn''t it supposed to populate the class with the database column
> information?
>
> The generate command completed successfully with no errors. I''m
> totally lost at this point. Any pointers would be greatly appreciated.
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Still confused. Shouldn''t the database migration .rb file under db/
migrate contain something that looks like my column names? I don''t see
any files that contains any of my column names.

On Feb 8, 10:19 pm, ebrad
<nisguy_...-/E1597aS9LQAvxtiuMwx3w@public.gmane.org>
wrote:
> The model''s not supposed to populate with anything.  The
connections
> are made in ActiveRecord behind the scenes. However, if you created a
> scaffold, there should be some new files in the app/views/emails
> directory if you had any columns in your table.
>
> On Feb 9, 12:18
am,lxp149<luying....-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
>
>
> > I''ve been trying to figure this out since yesterday afternoon
with no
> > success. I''ve tried to run ruby with oracle, 11, 10, and as
of today
> > 10g XE. The problem is obviously not on the oracle side because I can
> > query the database successfully using the command-line ruby exec
> > command.
>
> > But after I created an a simple ruby application with a simple
> > database table called emails that contains only one column called
> > email, running the generate scaffold command leaves me with an empty
> > class in email.rb:
>
> > class Email < ActiveRecord::Base
> > end
>
> > Isn''t it supposed to populate the class with the database
column
> > information?
>
> > The generate command completed successfully with no errors.
I''m
> > totally lost at this point. Any pointers would be greatly
appreciated.- Hide quoted text -
>
> - Show quoted text -
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On 2/11/08, lxp149 <luying.pan-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
>
> Still confused. Shouldn''t the database migration .rb file under
db/
> migrate contain something that looks like my column names? I don''t
see
> any files that contains any of my column names.
> > On Feb 9, 12:18
am,lxp149<luying....-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> >
> >
> >
> > > I''ve been trying to figure this out since yesterday
afternoon with no
> > > success. I''ve tried to run ruby with oracle, 11, 10, and
as of today
> > > 10g XE. The problem is obviously not on the oracle side because I
can
> > > query the database successfully using the command-line ruby exec
> > > command.
> >
> > > But after I created an a simple ruby application with a simple
> > > database table called emails that contains only one column called
> > > email, running the generate scaffold command leaves me with an
empty
> > > class in email.rb:
It sound like you somehow created the table first then tried to use
script/generate scaffold

This isn''t the way it works.  If you did say:

script/generate scaffold email body:text recipient:string

then it would generate a model, controller, views, AND a migration
file which would create a table called emails with three columns: id
(the primary key), body, and recipient.

script/generate scafold does not READ the database to get a table definition.
-- 
Rick DeNatale

My blog on Ruby
http://talklikeaduck.denhaven2.com/

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Sounds like you are missing rake db:migrate ?

Your migration files are located at PROJECT/db/migrate/00*.rb
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This link explains my confusion. I almost gave up because I couldn''t
get any of the basic tutorials going.
http://wiki.rubyonrails.com/rails/pages/ScaffoldGenerator


The first sentence says "Rails 2.0.0+ breaks chapter 1 of every
existing quality rails tutorial because of scaffolding." Sigh ... it
makes me not so hopeful about learning this new platform. This seems
to be the general problem with any open source platform. Bad or lack
of quality documentation. It''s too easy to get stuck, and too hard to
get out of being stuck.

On Feb 11, 2:52 pm, heimdull
<fre...-RCI/mp9mI1I6GGFevw1D/A@public.gmane.org>
wrote:
> Sounds like you are missing rake db:migrate ?
>
> Your migration files are located at PROJECT/db/migrate/00*.rb
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I don''t think it''s the case of bad or lack of documentation,
it''s just
a new version that isn''t full covered yet.

You can use the tutorials on the rails 1.2.x if you create your
application with: rails _1.2.6_, for example.

Then you can follow the 1.2.x tutorials to learn rails and after that
migrate to 2.0. That''s the path I recommend.

[]''s
Marcos

On Feb 12, 12:21 pm, lxp149
<luying....-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> This link explains my confusion. I almost gave up because I
couldn''t
> get any of the basic tutorials
going.http://wiki.rubyonrails.com/rails/pages/ScaffoldGenerator
>
> The first sentence says "Rails 2.0.0+ breaks chapter 1 of every
> existing quality rails tutorial because of scaffolding." Sigh ... it
> makes me not so hopeful about learning this new platform. This seems
> to be the general problem with any open source platform. Bad or lack
> of quality documentation. It''s too easy to get stuck, and too hard
to
> get out of being stuck.
>
> On Feb 11, 2:52 pm, heimdull
<fre...-RCI/mp9mI1I6GGFevw1D/A@public.gmane.org> wrote:
>
> > Sounds like you are missing rake db:migrate ?
>
> > Your migration files are located at PROJECT/db/migrate/00*.rb
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Well. All''s good. It''s finally working. I did learn a lot
through this
digging process. It''s definitely not as easy as a lot of people say
though.

On Feb 12, 9:02 am, VM <marco...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> I don''t think it''s the case of bad or lack of
documentation, it''s just
> a new version that isn''t full covered yet.
>
> You can use the tutorials on the rails 1.2.x if you create your
> application with: rails _1.2.6_, for example.
>
> Then you can follow the 1.2.x tutorials to learn rails and after that
> migrate to 2.0. That''s the path I recommend.
>
> []''s
> Marcos
>
> On Feb 12, 12:21 pm, lxp149
<luying....-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> > This link explains my confusion. I almost gave up because I
couldn''t
> > get any of the basic tutorials
going.http://wiki.rubyonrails.com/rails/pages/ScaffoldGenerator
>
> > The first sentence says "Rails 2.0.0+ breaks chapter 1 of every
> > existing quality rails tutorial because of scaffolding." Sigh ...
it
> > makes me not so hopeful about learning this new platform. This seems
> > to be the general problem with any open source platform. Bad or lack
> > of quality documentation. It''s too easy to get stuck, and too
hard to
> > get out of being stuck.
>
> > On Feb 11, 2:52 pm, heimdull
<fre...-RCI/mp9mI1I6GGFevw1D/A@public.gmane.org> wrote:
>
> > > Sounds like you are missing rake db:migrate ?
>
> > > Your migration files are located at PROJECT/db/migrate/00*.rb
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I completely agree with you. Half of the tutorials don''t work with the
latest release and th changes are quite significant without barealy
any compatibility. It is taking forever to find out what is in the
present release. So much for the ''agile'' platform.

On Feb 12, 3:18 pm, lxp149
<luying....-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> Well. All''s good. It''s finally working. I did learn a lot
through this
> digging process. It''s definitely not as easy as a lot of people
say
> though.
>
> On Feb 12, 9:02 am, VM
<marco...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
>
>
> > I don''t think it''s the case of bad or lack of
documentation, it''s just
> > a new version that isn''t full covered yet.
>
> > You can use the tutorials on the rails 1.2.x if you create your
> > application with: rails _1.2.6_, for example.
>
> > Then you can follow the 1.2.x tutorials to learn rails and after that
> > migrate to 2.0. That''s the path I recommend.
>
> > []''s
> > Marcos
>
> > On Feb 12, 12:21 pm, lxp149
<luying....-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> > > This link explains my confusion. I almost gave up because I
couldn''t
> > > get any of the basic tutorials
going.http://wiki.rubyonrails.com/rails/pages/ScaffoldGenerator
>
> > > The first sentence says "Rails 2.0.0+ breaks chapter 1 of
every
> > > existing quality rails tutorial because of scaffolding."
Sigh ... it
> > > makes me not so hopeful about learning this new platform. This
seems
> > > to be the general problem with any open source platform. Bad or
lack
> > > of quality documentation. It''s too easy to get stuck,
and too hard to
> > > get out of being stuck.
>
> > > On Feb 11, 2:52 pm, heimdull
<fre...-RCI/mp9mI1I6GGFevw1D/A@public.gmane.org> wrote:
>
> > > > Sounds like you are missing rake db:migrate ?
>
> > > > Your migration files are located at
PROJECT/db/migrate/00*.rb- Hide quoted text -
>
> - Show quoted text -
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On 10 Mar 2008, at 03:46, Jimmy wrote:
>
> I completely agree with you. Half of the tutorials don''t work with
the
> latest release and th changes are quite significant without barealy
> any compatibility. It is taking forever to find out what is in the
> present release. So much for the ''agile'' platform.
tutorials have been hit disproportionately hard, because they tend to  
lean on things that were extracted (scaffolding).
My rails 1.2 apps required very little changes (basically just  
grabbing the plugins for the extracted features).

Fred
>
>
> On Feb 12, 3:18 pm, lxp149
<luying....-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>> Well. All''s good. It''s finally working. I did learn a
lot through
>> this
>> digging process. It''s definitely not as easy as a lot of
people say
>> though.
>>
>> On Feb 12, 9:02 am, VM
<marco...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>>
>>
>>
>>> I don''t think it''s the case of bad or lack of
documentation, it''s
>>> just
>>> a new version that isn''t full covered yet.
>>
>>> You can use the tutorials on the rails 1.2.x if you create your
>>> application with: rails _1.2.6_, for example.
>>
>>> Then you can follow the 1.2.x tutorials to learn rails and after  
>>> that
>>> migrate to 2.0. That''s the path I recommend.
>>
>>> []''s
>>> Marcos
>>
>>> On Feb 12, 12:21 pm, lxp149
<luying....-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>>
>>>> This link explains my confusion. I almost gave up because I  
>>>> couldn''t
>>>> get any of the basic tutorials
going.http://wiki.rubyonrails.com/rails/pages/ScaffoldGenerator
>>
>>>> The first sentence says "Rails 2.0.0+ breaks chapter 1 of
every
>>>> existing quality rails tutorial because of scaffolding."
Sigh ...
>>>> it
>>>> makes me not so hopeful about learning this new platform. This
>>>> seems
>>>> to be the general problem with any open source platform. Bad or
>>>> lack
>>>> of quality documentation. It''s too easy to get stuck,
and too
>>>> hard to
>>>> get out of being stuck.
>>
>>>> On Feb 11, 2:52 pm, heimdull
<fre...-RCI/mp9mI1I6GGFevw1D/A@public.gmane.org> wrote:
>>
>>>>> Sounds like you are missing rake db:migrate ?
>>
>>>>> Your migration files are located at
PROJECT/db/migrate/00*.rb-
>>>>> Hide quoted text -
>>
>> - Show quoted text -
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>

I agree.  It''s not at all the fault of the framework that the freebie
tutorials have failed to keep up.  With respect to the tutorials...
you get what you paid for.  If you''re willing to invest in your Rails
education, I''d recommend "The Rails Way" (Fernandez,
Addison-Wesley
Professional series).  It''s as comprehensive a text as you''ll
find AND
it was written with Rails 2.x in view.  Also, railscasts is a great
(still free!) source for tutorials.  You''ll probably want to
concentrate on the later editions since they will cover Rails 2.x as
well.

On Mar 10, 6:35 am, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> On 10 Mar 2008, at 03:46, Jimmy wrote:
>
>
>
> > I completely agree with you. Half of the tutorials don''t work
with the
> > latest release and th changes are quite significant without barealy
> > any compatibility. It is taking forever to find out what is in the
> > present release. So much for the ''agile'' platform.
>
> tutorials have been hit disproportionately hard, because they tend to
> lean on things that were extracted (scaffolding).
> My rails 1.2 apps required very little changes (basically just
> grabbing the plugins for the extracted features).
>
> Fred
>
>
>
> > On Feb 12, 3:18 pm, lxp149
<luying....-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> >> Well. All''s good. It''s finally working. I did
learn a lot through
> >> this
> >> digging process. It''s definitely not as easy as a lot of
people say
> >> though.
>
> >> On Feb 12, 9:02 am, VM
<marco...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> >>> I don''t think it''s the case of bad or lack
of documentation, it''s
> >>> just
> >>> a new version that isn''t full covered yet.
>
> >>> You can use the tutorials on the rails 1.2.x if you create
your
> >>> application with: rails _1.2.6_, for example.
>
> >>> Then you can follow the 1.2.x tutorials to learn rails and
after
> >>> that
> >>> migrate to 2.0. That''s the path I recommend.
>
> >>> []''s
> >>> Marcos
>
> >>> On Feb 12, 12:21 pm, lxp149
<luying....-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> >>>> This link explains my confusion. I almost gave up because
I
> >>>> couldn''t
> >>>> get any of the basic tutorials
going.http://wiki.rubyonrails.com/rails/pages/ScaffoldGenerator
>
> >>>> The first sentence says "Rails 2.0.0+ breaks chapter
1 of every
> >>>> existing quality rails tutorial because of
scaffolding." Sigh ...
> >>>> it
> >>>> makes me not so hopeful about learning this new platform.
This
> >>>> seems
> >>>> to be the general problem with any open source platform.
Bad or
> >>>> lack
> >>>> of quality documentation. It''s too easy to get
stuck, and too
> >>>> hard to
> >>>> get out of being stuck.
>
> >>>> On Feb 11, 2:52 pm, heimdull
<fre...-RCI/mp9mI1I6GGFevw1D/A@public.gmane.org> wrote:
>
> >>>>> Sounds like you are missing rake db:migrate ?
>
> >>>>> Your migration files are located at
PROJECT/db/migrate/00*.rb-
> >>>>> Hide quoted text -
>
> >> - Show quoted text -
> > >
>
>
>  smime.p7s
> 5KDownload
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