Rails - Apr 2006 - Is old school STI broken? How would you do the same now?

So this new STI :through thing is still not clear to me.  I have a 
project now where I''m using this:

  class List < ActiveRecord::Base
    belongs_to :user
  end

  class StaticList < List
    has_and_belongs_to_many :items
  end

In the script/console:

  >> StaticList.create
  NameError: uninitialized constant StaticList

What?  ok, fine.  So a List.create would be in order, except no matter 
what is passed into :type =>, it ends up with "List" in the
database''s
type column.  Is there a better way to model this with the :through 
feature?  Why isn''t rails finding the StaticList class? Is this a bug?
A
feature? The definition is in the same file as class List...

Thanks for any pointers,

--
Matthew Beale :: mixonic@synitech.com
Resume & Portfolio @ http://madhatted.com

-- 
Posted via http://www.ruby-forum.com/.

Have you declared the list model in application.rb?

class ApplicationController < ActionController::Base
  model :list

You need to do this so the application knows about StaticList class (It 
will only know about the subclass once it''s read the list.rb model 
declaration)

Hope this helps.
Chris T


Matthew Beale wrote:
> So this new STI :through thing is still not clear to me.  I have a 
> project now where I''m using this:
>
>   class List < ActiveRecord::Base
>     belongs_to :user
>   end
>
>   class StaticList < List
>     has_and_belongs_to_many :items
>   end
>
> In the script/console:
>
>   >> StaticList.create
>   NameError: uninitialized constant StaticList
>
> What?  ok, fine.  So a List.create would be in order, except no matter 
> what is passed into :type =>, it ends up with "List" in the
database''s
> type column.  Is there a better way to model this with the :through 
> feature?  Why isn''t rails finding the StaticList class? Is this a
bug? A
> feature? The definition is in the same file as class List...
>
> Thanks for any pointers,
>
> --
> Matthew Beale :: mixonic@synitech.com
> Resume & Portfolio @ http://madhatted.com
>
>

-------------- Original message ----------------------
From: Chris T <ctmailinglists@googlemail.com>
> Have you declared the list model in application.rb?
> 
> class ApplicationController < ActionController::Base
>   model :list
> 
> You need to do this so the application knows about StaticList class (It 
> will only know about the subclass once it''s read the list.rb model
> declaration)
I Might Be Wrong, but I don''t think you don''t need to do this.
Just name the file static_list.rb -- active_support overrides
Object.const_missing so that constant references get snake-cased and
require''d.

Devin

Chris T wrote:
> Have you declared the list model in application.rb?
> 
> class ApplicationController < ActionController::Base
>   model :list
right, models/list.rb is definitly getting loaded, I run tests on it, I 
have been using it to create, that''s not a problem.  As far as I recall
(though i have not dug through the current rails code to be sure) every 
class in list.rb will be loaded.  I could throw foobarfoo.rb in the 
models directory and it''s contents would be loaded.
> You need to do this so the application knows about StaticList class (It
> will only know about the subclass once it''s read the list.rb model
> declaration)
Well, once it reads the list.rb file yeah, which it is doing.  Hence my 
own confusion :-)




-- 
Posted via http://www.ruby-forum.com/.

Chris T wrote:
> Have you declared the list model in application.rb?
> 
> class ApplicationController < ActionController::Base
>   model :list
right, models/list.rb is definitly getting loaded, I run tests on it, I 
have been using it to create, that''s not a problem.  As far as I recall
(though i have not dug through the current rails code to be sure) every 
class in list.rb will be loaded.  I could throw foobarfoo.rb in the 
models directory and it''s contents would be loaded.
> You need to do this so the application knows about StaticList class (It
> will only know about the subclass once it''s read the list.rb model
> declaration)
Well, once it reads the list.rb file yeah, which it is doing.  Hence my 
own confusion :-)

--
Matthew Beale :: mixonic@synitech.com
Resume & Portfolio @ http://madhatted.com




-- 
Posted via http://www.ruby-forum.com/.

for the magic to happen, you need TWO files.  One called list.rb  
defines List and one called static_list.rb that defines StaticList.

The spells don''t work if you don''t pronounce them properly.
;-)

-Rob

Rob Biedenharn		http://agileconsultingllc.com
Rob@AgileConsultingLLC.com
+1 513-295-4739


On Apr 3, 2006, at 2:12 PM, Matthew Beale wrote:
> Chris T wrote:
>> Have you declared the list model in application.rb?
>>
>> class ApplicationController < ActionController::Base
>>   model :list
>
> right, models/list.rb is definitly getting loaded, I run tests on  
> it, I
> have been using it to create, that''s not a problem.  As far as I  
> recall
> (though i have not dug through the current rails code to be sure)  
> every
> class in list.rb will be loaded.  I could throw foobarfoo.rb in the
> models directory and it''s contents would be loaded.
>
>> You need to do this so the application knows about StaticList  
>> class (It
>> will only know about the subclass once it''s read the list.rb
model
>> declaration)
>
> Well, once it reads the list.rb file yeah, which it is doing.   
> Hence my
> own confusion :-)
>
> --
> Matthew Beale :: mixonic@synitech.com
> Resume & Portfolio @ http://madhatted.com
>
>
>
>
> -- 
> Posted via http://www.ruby-forum.com/.
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