Rails - Apr 2005 - Application-wide model scope question

In my application, I have a common layout 
(''/app/views/layouts/layout.rhtml'').  In that file, I want to
iterate
over the 10 most recent NewsPosts to create links for them.  I can do 
that by putting:

@recent_news = NewsPost.find(:all, :order => ''created_on
DESC'', :limit
=> 10)

in every controller so that @recent_news is accessible to all when Rails 
goes to render the layout.  Of course, that''s not very DRY.  I have 
tried putting that in application.rb and application_helper.rb (and 
maybe some other places), but the NewsPost model isn''t in scope there.

So what''s the proper way to handle this sort of thing?  (I apologize if
this is often-asked, but I can''t find an answer)

Thanks,
Myles

Hey Myles,

you can define a "before_filter" in your ApplicationController which 
calls the news list for each request.

Second way would be creating a Component 
(http://manuals.rubyonrails.com/read/book/14) for your recent news.

.b

Am 30.04.2005 um 19:18 schrieb Myles Grant:
> In my application, I have a common layout 
> (''/app/views/layouts/layout.rhtml'').  In that file, I
want to iterate
> over the 10 most recent NewsPosts to create links for them.  I can do 
> that by putting:
>
> @recent_news = NewsPost.find(:all, :order => ''created_on
DESC'', :limit
> => 10)
>
> in every controller so that @recent_news is accessible to all when 
> Rails goes to render the layout.  Of course, that''s not very DRY. 
I
> have tried putting that in application.rb and application_helper.rb 
> (and maybe some other places), but the NewsPost model isn''t in
scope
> there.
>
> So what''s the proper way to handle this sort of thing?  (I
apologize
> if this is often-asked, but I can''t find an answer)
>
> Thanks,
> Myles
>
> _______________________________________________
> Rails mailing list
> Rails-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org
> http://lists.rubyonrails.org/mailman/listinfo/rails

On 30-apr-05, at 19:18, Myles Grant wrote:
> In my application, I have a common layout 
> (''/app/views/layouts/layout.rhtml'').  In that file, I
want to iterate
> over the 10 most recent NewsPosts to create links for them.  I can do 
> that by putting:
>
> @recent_news = NewsPost.find(:all, :order => ''created_on
DESC'', :limit
> => 10)
>
> in every controller so that @recent_news is accessible to all when 
> Rails goes to render the layout.  Of course, that''s not very DRY. 
I
> have tried putting that in application.rb and application_helper.rb 
> (and maybe some other places), but the NewsPost model isn''t in
scope
> there.
>
> So what''s the proper way to handle this sort of thing?  (I
apologize
> if this is often-asked, but I can''t find an answer)
>
What do you mean "not in scope"? The instance variable is not 
accessible from the layout or the model class is not defined in your 
controller?
-- 
Julian "Julik" Tarkhanov

Julian ''Julik'' Tarkhanov wrote:
>
> On 30-apr-05, at 19:18, Myles Grant wrote:
>
>> In my application, I have a common layout 
>> (''/app/views/layouts/layout.rhtml'').  In that file, I
want to iterate
>> over the 10 most recent NewsPosts to create links for them.  I can do 
>> that by putting:
>>
>> @recent_news = NewsPost.find(:all, :order => ''created_on
DESC'',
>> :limit => 10)
>>
>> in every controller so that @recent_news is accessible to all when 
>> Rails goes to render the layout.  Of course, that''s not very
DRY.  I
>> have tried putting that in application.rb and application_helper.rb 
>> (and maybe some other places), but the NewsPost model isn''t in
scope
>> there.
>>
>> So what''s the proper way to handle this sort of thing?  (I
apologize
>> if this is often-asked, but I can''t find an answer)
>>
>
> What do you mean "not in scope"? The instance variable is not 
> accessible from the layout or the model class is not defined in your 
> controller?
I can''t put:

@recent_news = NewsPost.find(:all, :order => ''created_on
DESC'', :limit
=> 10)

in application.rb because the NewsPost model class isn''t defined in 
there.  I think I''m going to use the previous suggestion of components 
though.

Thanks,
Myles

Myles,
Take a look at the Controller Dependencies here:
http://api.rubyonrails.com/classes/ActionController/Dependencies/ClassMethods.html

Use:
model :news_post

at the top of your Application.rb file, then you probably want a filter to 
run before loading each page, take a look here for those:
http://api.rubyonrails.com/classes/ActionController/Filters/ClassMethods.html

I would assume you''d only want something like:
before_filter :fetch_news, :only=>[:show]

That might also be a good use for components though. Try it out ;)

.adam sanderson


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