How to delete nested resource?

Rails
1

Hi,

I got News model that has_one Asset. Asset belongs_to News.
AssetsController has only detroy method, asset is created in
NewsController create action. Both resources are in admin namespace.

Now I’d like to delete the asset. I tried something like this:

<%= link_to ‘delete’, admin_news_item_asset_path(@news,
@news.asset), :confirm => ‘Are you sure?’, :method => :delete %>

but I get the following error:

undefined method has_key?' for #<Asset:0xb6a22798> vendor/rails/activerecord/lib/active_record/attribute_methods.rb: 240:inmethod_missing’
vendor/rails/activerecord/lib/active_record/associations/
association_proxy.rb:128:in send' vendor/rails/activerecord/lib/active_record/associations/ association_proxy.rb:128:inmethod_missing’
(eval):3:in `admin_news_item_asset_path’
…

If I use the following link:
<%= link_to ‘delete’, admin_news_item_asset_path(@news), :confirm =>
‘Are you sure?’, :method => :delete %>
I don’t get any errors, but I don’t get asset id as well, only
news_item_id. I could use this to delete associated asset, but I’d
like to make it work as it should.

The routes are as follows:
map.namespace :admin do |admin|
admin.resources :news, :singular => ‘news_item’, :member =>
{ :preview => :get } do |news_item|
news_item.resource :asset
end
end

I’m using rails 2.0.2.

Thanks in advance

2

not 100% sure, but:
admin_news_item_asset_path(@news, @news.asset)

should be something like:
admin_news_item_asset_path(@news, :asset_id => @news.asset)

since rails can guess the param name (:id) only for those
parts of the path, that are declared in the routes, all
others must be named in hash fashion

3

but i’m not sure, if you need that here.
why hand over the asset.id, if it’s stored in @news anyway
you could simply call the thing for @news
and in destroy use @news.asset

or in the has_one declaration simply add:
has_one :asset, :dependent => destroy
and you’ll never have to think about it again…

4

On Mar 21, 11:22 am, Thorsten M. <rails-mailing-l…@andreas-
s.net> wrote:

Posted viahttp://www.ruby-forum.com/.
Thanks.

It works, but I still think that rails should automatically figure out
ID of the second parameter passed.

If I run “rake routes”, I can see “admin_news_item_asset_path” listed
there together with DELETE method… The generated url is “/admin/news/
23/asset?id=35”, but it should be enough for rails to figure out ID of
the asset even with url like this “/admin/news/23/asset”.

5

Em Friday 21 March 2008, szimek escreveu:
[…]

The generated url is “/admin/news/
23/asset?id=35”, but it should be enough for rails to figure out ID of
the asset even with url like this “/admin/news/23/asset”.

Only if news has_one asset. Otherwise, Rails can’t figure out which of
N
assets you want to delete.

Sorry my poor English.

Best regards,

Davi V.

E-mail: [email protected]
MSN : [email protected]
GTalk : [email protected]
Skype : davi vidal
YIM : davi_vidal
ICQ : 138815296

6

Em Friday 21 March 2008, szimek escreveu:

On Mar 21, 12:41 pm, Davi V. [email protected] wrote:

Em Friday 21 March 2008, szimek escreveu:
[…]

The generated url is “/admin/news/
23/asset?id=35”, but it should be enough for rails to figure out ID of
the asset even with url like this “/admin/news/23/asset”.

    Only if news has_one asset. Otherwise, Rails can't figure out

which of N assets you want to delete.
[…]

Thanks, but I have specified the relationship: News has_one :asset,
Asset belongs_to :news.

Sorry. I missed the point here. You’re right.

Best regards,

Davi V.

E-mail: [email protected]
MSN : [email protected]
GTalk : [email protected]
Skype : davi vidal
YIM : davi_vidal
ICQ : 138815296

7

On Mar 21, 12:41 pm, Davi V. [email protected] wrote:

    Sorry my poor English.

ICQ : 138815296
Thanks, but I have specified the relationship: News has_one :asset,
Asset belongs_to :news.

BTW. I’m using edge rails 67328 and not 2.0.2 version.