Polymorphic Routes in Rails 4.1.4

Question

I have a polymorphic association between Posts and Postables, right now with Projects being my only Postables. In my routes, I have:

resources :projects do
  ...

  member do
    resources :posts
  end
end

I know how to retrieve the right ids from the parameters, and all of my controller specs pass just fine, but when I try to write links in my views, they don't work. Running rake routes , I see a little weirdness:

...

post SHOW      /projects/:id/posts/:id(.:format)    posts#edit

...

And so on for the rest. If I'm not mistaken, the path should be 'new_project_post', and the first parameter should be :project_id .

Now, in my show view for Projects, I have the index of posts for that particular project. But the links don't work. Lets assume I have a project with an ID of 2, and a post for that project with an ID of 1.

If I try link_to 'Edit', edit_post_path(@project, post) , the link comes out as .../projects/1/posts/1/edit , so both :id s get the post's id. If I swap post and @project , both :id s will be the project's id.

If I try passing them as an array, link_to 'Edit', post_path([post, @project]) , the resulting link will be .../projects/1%2F2/posts/1%2F2/edit . %2F is a URL-encoded slash character, so I'm not sure what the hell Rails is trying to do here.

If I try using polymorphic_path([@project, post]) for my links, all it does is spit out paths that don't exist: undefined method 'project_post_path'

I've tried several other combinations of parameters without success. So if anyone could point me in the right direction, I'd be extremely grateful.

Answer 1

The appropriate syntax for nested resources in Rails is:

resources :projects do
  resources :posts
end

In member block you could only declare additional actions to work with project instances.

Answer 2

You are using nested resource inside member and it is incorrect. Read more about this here: http://thelazylog.com/posts/polymorphic-routes-in-rails