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Carl H.

2007-Jun-05 16:21 UTC

Access the ''parent'' resource from a nested one?

Is there a possibility in an action to get the parent controller for
which the nested resource is called? for instance if I have the
following in my routes.rb:

  map.resources :user do |users|
    users.resources :logos
  end

  map.resources :pic do |pics|
    pics.resources :logos
  end

How easy would it be to get the parent? for instance I could call the
following 2 URLs:
http://localhost:3000/pics/#{pic_id}/logos/#{logo_id} and
http://localhost:3000/users/#{user_id}/logos/#{logo_id}

Can I know which parent I am currently in?

Further explanations follows:

The logo class is a polymorphic class defined as follow:

class Pic < ActiveRecord::Base
   has_one :logo, :as => :logoable
end

class User < ActiveRecord::Base
   has_one :logo, :as => :logoable
end

class Logo < FlexImage::Model
  belongs_to :logoable, :polymorphic => true
end

Now in my logo controller, I want to show the correct logo for the
correct parent controller. The URL would look something like:

http://localhost:3000/pics/#{pic_id}/logos/#{size}

Or

http://localhost:3000/users/#{user_id}/logos/#{size}

in my show action in the logo controller I have something like:

logo = Logo.find(:first, :conditions => {:logoable_type
=> ..., :logoable_id => ...})

logoable_type is either User or Pic. However, I can not see how to get
that value easily. I could play around with the param hash as it will
return either pic_id or user_id. Is there any simpler way to know
which parent the nested ressource is called from?

The above to follow DRY. Is there a way to map back from the action to
the parent controller?

I probably need a bit of REST vocabulary but hopefully it is clear
enough.

Regards,
Carl


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Gabe da Silveira

2007-Jun-05 16:37 UTC

head link

Re: Access the ''parent'' resource from a nested one?

I don''t see what would be simpler than using pic_id or user_id (maybe
there is something?).  From those you can generate any kind of setup
you want, just put in a before_filter so it''s available to all
actions.  Or do something like:

private
def pic?
  !params[:pic_id].blank?
end

Not sure if there''s anything built-in, but I don''t see the
need for it.

On 6/5/07, Carl H. <charroch-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:>
> Is there a possibility in an action to get the parent controller for
> which the nested resource is called? for instance if I have the
> following in my routes.rb:
>
>   map.resources :user do |users|
>     users.resources :logos
>   end
>
>   map.resources :pic do |pics|
>     pics.resources :logos
>   end
>
> How easy would it be to get the parent? for instance I could call the
> following 2 URLs:
> http://localhost:3000/pics/#{pic_id}/logos/#{logo_id} and
> http://localhost:3000/users/#{user_id}/logos/#{logo_id}
>
> Can I know which parent I am currently in?
>
> Further explanations follows:
>
> The logo class is a polymorphic class defined as follow:
>
> class Pic < ActiveRecord::Base
>    has_one :logo, :as => :logoable
> end
>
> class User < ActiveRecord::Base
>    has_one :logo, :as => :logoable
> end
>
> class Logo < FlexImage::Model
>   belongs_to :logoable, :polymorphic => true
> end
>
> Now in my logo controller, I want to show the correct logo for the
> correct parent controller. The URL would look something like:
>
> http://localhost:3000/pics/#{pic_id}/logos/#{size}
>
> Or
>
> http://localhost:3000/users/#{user_id}/logos/#{size}
>
> in my show action in the logo controller I have something like:
>
> logo = Logo.find(:first, :conditions => {:logoable_type
> => ..., :logoable_id => ...})
>
> logoable_type is either User or Pic. However, I can not see how to get
> that value easily. I could play around with the param hash as it will
> return either pic_id or user_id. Is there any simpler way to know
> which parent the nested ressource is called from?
>
> The above to follow DRY. Is there a way to map back from the action to
> the parent controller?
>
> I probably need a bit of REST vocabulary but hopefully it is clear
> enough.
>
> Regards,
> Carl
>
>
> >
>

-- 
Gabe da Silveira
http://darwinweb.net

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Val

2007-Jun-05 16:53 UTC

head link

Re: Access the ''parent'' resource from a nested one?

Carl,

You can find an approach you can use discussed here
http://revolutiononrails.blogspot.com/2007/05/drying-up-polymorphic-controllers.html

Regards,
Val

On Jun 5, 12:21 pm, "Carl H."
<charr...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> Is there a possibility in an action to get the parent controller for
> which the nested resource is called? for instance if I have the
> following in my routes.rb:
>
>   map.resources :user do |users|
>     users.resources :logos
>   end
>
>   map.resources :pic do |pics|
>     pics.resources :logos
>   end
>
> How easy would it be to get the parent? for instance I could call the
> following 2 URLs:http://localhost:3000/pics/#{pic_id}/logos/#{logo_id}
andhttp://localhost:3000/users/#{user_id}/logos/#{logo_id}
>
> Can I know which parent I am currently in?
>
> Further explanations follows:
>
> The logo class is a polymorphic class defined as follow:
>
> class Pic < ActiveRecord::Base
>    has_one :logo, :as => :logoable
> end
>
> class User < ActiveRecord::Base
>    has_one :logo, :as => :logoable
> end
>
> class Logo < FlexImage::Model
>   belongs_to :logoable, :polymorphic => true
> end
>
> Now in my logo controller, I want to show the correct logo for the
> correct parent controller. The URL would look something like:
>
> http://localhost:3000/pics/#{pic_id}/logos/#{size}
>
> Or
>
> http://localhost:3000/users/#{user_id}/logos/#{size}
>
> in my show action in the logo controller I have something like:
>
> logo = Logo.find(:first, :conditions => {:logoable_type
> => ..., :logoable_id => ...})
>
> logoable_type is either User or Pic. However, I can not see how to get
> that value easily. I could play around with the param hash as it will
> return either pic_id or user_id. Is there any simpler way to know
> which parent the nested ressource is called from?
>
> The above to follow DRY. Is there a way to map back from the action to
> the parent controller?
>
> I probably need a bit of REST vocabulary but hopefully it is clear
> enough.
>
> Regards,
> Carl

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Carl H.

2007-Jun-06 10:13 UTC

head link

Re: Access the ''parent'' resource from a nested one?

Val,

Thanks for the post, that looks to be exactly what I am looking for. I
will leave any comments if any on the article.

Regards,
Carl

On Jun 5, 5:53 pm, Val
<v.alekse...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> Carl,
>
> You can find an approach you can use discussed
herehttp://revolutiononrails.blogspot.com/2007/05/drying-up-polymorphic-c...
>
> Regards,
> Val
>
> On Jun 5, 12:21 pm, "Carl H."
<charr...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> > Is there a possibility in an action to get the parent controller for
> > which the nested resource is called? for instance if I have the
> > following in my routes.rb:
>
> >   map.resources :user do |users|
> >     users.resources :logos
> >   end
>
> >   map.resources :pic do |pics|
> >     pics.resources :logos
> >   end
>
> > How easy would it be to get the parent? for instance I could call the
> > following 2 URLs:http://localhost:3000/pics/#{pic_id}/logos/#{logo_id}
andhttp://localhost:3000/users/#{user_id}/logos/#{logo_id}
>
> > Can I know which parent I am currently in?
>
> > Further explanations follows:
>
> > The logo class is a polymorphic class defined as follow:
>
> > class Pic < ActiveRecord::Base
> >    has_one :logo, :as => :logoable
> > end
>
> > class User < ActiveRecord::Base
> >    has_one :logo, :as => :logoable
> > end
>
> > class Logo < FlexImage::Model
> >   belongs_to :logoable, :polymorphic => true
> > end
>
> > Now in my logo controller, I want to show the correct logo for the
> > correct parent controller. The URL would look something like:
>
> >http://localhost:3000/pics/#{pic_id}/logos/#{size}
>
> > Or
>
> >http://localhost:3000/users/#{user_id}/logos/#{size}
>
> > in my show action in the logo controller I have something like:
>
> > logo = Logo.find(:first, :conditions => {:logoable_type
> > => ..., :logoable_id => ...})
>
> > logoable_type is either User or Pic. However, I can not see how to get
> > that value easily. I could play around with the param hash as it will
> > return either pic_id or user_id. Is there any simpler way to know
> > which parent the nested ressource is called from?
>
> > The above to follow DRY. Is there a way to map back from the action to
> > the parent controller?
>
> > I probably need a bit of REST vocabulary but hopefully it is clear
> > enough.
>
> > Regards,
> > Carl

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Rails - Jun 2007 - Access the 'parent' resource from a nested one?

Access the ''parent'' resource from a nested one?

Re: Access the ''parent'' resource from a nested one?

Re: Access the ''parent'' resource from a nested one?

Re: Access the ''parent'' resource from a nested one?