polymorphic_path或url_用于自定义控制器名称

Question

I have a situation where I have @challenge and @idea instances from Challenge and Idea model responsively.

I have one partial which is going to used in many controllers, so based on controllers I want to generate path.

eg So when I am in IdeasController polymorphic_path([@challenge, @idea]) will generate "/challenges/12/ideas/45"

but if I am in any other controller suppose RefinementsController, I want generate path as "challenges/12/refinements/45"

How can I generate it using polymorphic_path or url_for

code:

app/controllers/ideas_controller.rb

class IdeasController < ApplicationController
  before_action :authenticate_user!
  load_and_authorize_resource :challenge
  load_and_authorize_resource :idea, through: :challenge

  def index
  end

  def show
  end
end

app/controllers/refinements_controller.rb

class RefinementsController < ApplicationController
  before_action :authenticate_user!
  load_and_authorize_resource :challenge, parent: true
  load_and_authorize_resource :idea, through: :challenge, parent: false

  def index
    @ideas = @ideas.refined
    render 'ideas/index'
  end

  def show
    render 'ideas/show'
  end
end

app/views/ideas/index.html.erb

<div class="ideas">
  <% @ideas.each do |idea| %>
    <div class="idea">
      <div class="title">
        <%= link_to idea.title, polymorphic_path([@challenge, idea]) %>
      </div>
    </div>
  <% end %>
</div>

app/views/ideas/show.html.erb

<div class="idea">
  <div class="title">
    <%= link_to idea.title, polymorphic_path([@challenge, @idea]) %>
  </div>
  <div class="descriptio">
    <%= @idea.description %>
  </div>
</div>

Answer 1

Although it's not a good practice but if it's only a minor change and rest of your partial is same in all cases then what you do is use some generic variable in your partial. In your case your polymorphic url depends on the initialized value of second variable ie @idea(as first part challenges/12/ is same) so you can do something like this:

polymorphic_path([@challenge,@something_generic])

and now depending on your controllers action you can change @something_generic to make proper url for your form

class IdeasController < ApplicationController
  def new
    @challenge = Challenge.find(params[:challenge_id])
    @something_generic = @challenge.ideas.build
  end
end

class RefinementsController < ApplicationController
  def new
    @challenge = Challenge.find(params[:challenge_id])
    @something_generic = @challenge.refinements.build
  end
end

Update:

Change your code to this:

class IdeasController < ApplicationController
  before_action :authenticate_user!
  load_and_authorize_resource :challenge
  load_and_authorize_resource :idea, through: :challenge

  def index
  end

  def show
    @something_generic = Idea.find(params[:id])
  end
end

class RefinementsController < ApplicationController
  before_action :authenticate_user!
  load_and_authorize_resource :challenge, parent: true
  load_and_authorize_resource :idea, through: :challenge, parent: false

  def index
    @something_generic = Refinement.find(params[:id])
    render 'ideas/index'
  end

  def show
    @something_generic = Refinement.find(params[:id])
    render 'ideas/show'
  end
end

Since you are using cancancan and have proper filters so @idea and @challenge will be defined automatically in your actions.

For index.html i think you'll be better of using separate templates but if you still want to use a single template then you can do something like this:

app/views/ideas/index.html.erb

<div class="ideas">
  <% @ideas.each do |idea| %>
    <div class="idea">
      <div class="title">
        <% if controller_name == "ideas" %>
          <%= link_to idea.title, polymorphic_path([@challenge, idea]) %>
        <% else %>
          <%= link_to idea.title, polymorphic_path([@challenge, @something_generic]) %>
        <% end %>
      </div>
    </div>
  <% end %>
</div>

and show.html.erb

<div class="idea">
  <div class="title">
    <%= link_to @idea.title, polymorphic_path([@challenge, @something_generic]) %>
  </div>
  <div class="description">
      <%= @idea.description %>
  </div>
</div>

Answer 2

Partial

Without having your partial code here, I'm going to make an assumption that you are calling polymorphic_path inside your partial, hence wanting to change the path as per the controller it's loaded from

If you're calling a partial, you have to remember its been designed to be an independent, modular element of your application, and so including @instance variables in your partial will likely be an antipattern

What I would recommend is to populate your partial with local variables , allowing you to populate those accordingly:

#app/controllers/ideas_controller.rb
Class IdeasController < ApplicationController
    def show
       @challenge = Challenge.find params[:challenge_id] if params[:challenge_id].present?
       @idea = Idea.find params[:id]
    end
end

#app/views/ideas/show.html.erb
<%= render "shared/partial", locals: {challenge: @challenge, child: @idea} %>

#app/views/shared/_partial.html.erb
<%= link_to "Test", polymorphic_path([challenge, child]) %>

--

Update

Thanks for your code

You'll be totally better be using the following:

#app/views/ideas/index.html.erb
<%= render "ideas/item", collection: @items, as: :item, locals: {challenge: @challenge} %>

#app/views/ideas/show.html.erb
<%= render "ideas/item", object: @item, as: :item, locals: {challenge: @challenge} %>

This will allow you to call:

#app/views/ideas/_idea.html.erb
<div class="idea">
  <div class="title">
    <%= link_to idea.title, polymorphic_path([challenge, idea]) %>
  </div>
  <% if action_name =="show" %>
    <div class="descriptio">
      <%= idea.description %>
    </div>
  <% end %>
</div>