Rails - Aug 2006 - Why does no one like render_component?

Maybe I''m missing the point?

Lets take for example albums of pictures.  If I have a scaffold for 
each, and I''m showing an album, what if I want to list all of the 
pictures that are in the album?

Surely, I''d want to call the List action in the picture controller. 
render_component would do this perfectly.  But we''re told not to use 
render_component.  So instead, I''ll have to put picture list as a 
partial... that means I''ll have to do the sql find for the @pictures in
the Album controller...?

-Ben Lisbakken

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

Ben Lisbakken <lisbakke@gmail.com> writes:
> Maybe I''m missing the point?
>
its not people don''t like them, but just don''t use them
everywhere because
they are slow. Using render_component is like making another request. 
using partials is better as they are faster.
> Lets take for example albums of pictures.  If I have a scaffold for 
> each, and I''m showing an album, what if I want to list all of the 
> pictures that are in the album?
>
> Surely, I''d want to call the List action in the picture
controller.
> render_component would do this perfectly.  But we''re told not to
use
> render_component.  So instead, I''ll have to put picture list as a 
> partial... that means I''ll have to do the sql find for the
@pictures in
> the Album controller...?
>
If you think that your application logic will be cleaner, and you can reuse
them at multiple places, even from outside the application, then use a
render_component. 

Cheers,
-- 
Surendra Singhi
http://ssinghi.kreeti.com, http://www.kreeti.com
Read my blog at: http://cuttingtheredtape.blogspot.com/
,----
| Great wits are sure to madness near allied,
| And thin partitions do their bounds divide.
| 
|     (John Dryden, Absalom and Achitophel, 1681)
`----

> Surely, I''d want to call the List action in the picture
controller.
> render_component would do this perfectly.  But we''re told not to
use
> render_component.  So instead, I''ll have to put picture list as a
> partial... that means I''ll have to do the sql find for the
@pictures in
> the Album controller...?
>
> -Ben Lisbakken
>
>
Ben:

Actually, if an Album has_many photos, then it''s a matter of doing this
in
your controller:

def list
   @album = Album.find(params[:id], :include=>[:photos]
   @photos = @album.photos
end

This gets you the album AND its photos in one database call.

Then in your view, you render the partial

<%=render :partial =>"/shared/photos" %>

Partials are definitely the way to go for most of this stuff. I had
component rendering going on in one of my earlier projects and I started
noticing some pretty nasty performance problems. I refactored several of
those into partials, and others I left in, but I made sure to use fragment
and action caching wherever I could to improve performance.
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Hi,

    I have a acts_as_tree model but I''m not able to create the first
item without a parent.

With this model:

	class Node < ActiveRecord::Base
		acts_as_tree
	end

I run:
	n = Node.new
	n.name = ''my node''
	n.save


I get this error

	ActiveRecord::RecordNotFound: Couldn''t find Subsystem without an ID
        from c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.3/lib/ac...

Please, my head is burning... I thought it was a database problem with fks, I
removed them but it persists.

Somebody help me!

TIA
Romeu Fonseca



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Somebody please!!!!

-----Mensagem original-----
De: rails-bounces@lists.rubyonrails.org
[mailto:rails-bounces@lists.rubyonrails.org] Em nome de Romeu Henrique
Capparelli Fonseca
Enviada em: quarta-feira, 16 de agosto de 2006 17:36
Para: rails@lists.rubyonrails.org
Assunto: [Rails] acts_as_tree: creating the first element

Hi,

    I have a acts_as_tree model but I''m not able to create the first
item without a parent.

With this model:

	class Node < ActiveRecord::Base
		acts_as_tree
	end

I run:
	n = Node.new
	n.name = ''my node''
	n.save


I get this error

	ActiveRecord::RecordNotFound: Couldn''t find Subsystem without an ID
        from c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.3/lib/ac...

Please, my head is burning... I thought it was a database problem with fks, I
removed them but it persists.

Somebody help me!

TIA
Romeu Fonseca



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Rails mailing list
Rails@lists.rubyonrails.org
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On Aug 16, 2006, at 3:35 PM, Romeu Henrique Capparelli Fonseca
wrote:
> 	ActiveRecord::RecordNotFound: Couldn''t find Subsystem without an
ID
>         from c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.3/lib/ 
> ac...
this looks like a db schema error -- check that you have appropriate  
primary and foreign keys, and if that fails, post your schema?

-faisal