Load answer through question in answers controller

We are simplifying the load answer and we can remove the ambiguous
hidden field from answer form.

app/controllers/admin/poll/questions/answers_controller.rb

@@ -2,17 +2,16 @@ class Admin::Poll::Questions::AnswersController < Admin::Poll::BaseController
   include Translatable
   include DocumentAttributes
 
-  before_action :load_answer, only: [:show, :edit, :update, :documents]
-
   load_and_authorize_resource :question, class: "::Poll::Question"
+  load_resource class: "::Poll::Question::Answer",
+                through: :question,
+                through_association: :question_answers,
+                except: :documents
 
   def new
-    @answer = @question.answers.new
   end
 
   def create
-    @answer = @question.answers.new(answer_params)
-
     if @answer.save
       redirect_to admin_question_path(@question),
                notice: t("flash.actions.create.poll_question_answer")
@@ -37,6 +36,7 @@ class Admin::Poll::Questions::AnswersController < Admin::Poll::BaseController
   end
 
   def documents
+    @answer = ::Poll::Question::Answer.find(params[:answer_id])
     @documents = @answer.documents
 
     render "admin/poll/questions/answers/documents"
@@ -54,16 +54,11 @@ class Admin::Poll::Questions::AnswersController < Admin::Poll::BaseController
     end
 
     def allowed_params
-      attributes = [:title, :description, :given_order, :question_id,
-                    documents_attributes: document_attributes]
+      attributes = [:title, :description, :given_order, documents_attributes: document_attributes]
 
       [*attributes, translation_params(Poll::Question::Answer)]
     end
 
-    def load_answer
-      @answer = ::Poll::Question::Answer.find(params[:id] || params[:answer_id])
-    end
-
     def resource
       load_answer unless @answer
       @answer

app/views/admin/poll/questions/answers/_form.html.erb

@@ -7,8 +7,6 @@
   <%= f.hidden_field :given_order,
         value: @answer.persisted? ? @answer.given_order : @answer.class.last_position(@answer.question_id || @question.id) + 1 %>
 
-  <%= f.hidden_field :question_id, value: @answer.question_id || @question.id %>
-
   <div class="row">
     <%= f.translatable_fields do |translations_form| %>
       <div class="column end">

app/views/admin/poll/questions/answers/documents.html.erb

@@ -9,7 +9,7 @@
 
 <div class="poll-question-form">
   <%= form_for(Poll::Question::Answer.new,
-              url: admin_answer_path(@answer),
+              url: admin_question_answer_path(@answer.question, @answer),
               method: :put) do |f| %>
 
     <%= render "shared/errors", resource: @answer %>

app/views/admin/poll/questions/answers/edit.html.erb

@@ -10,5 +10,5 @@
 </h2>
 
 <div class="poll-question-answer-form">
-  <%= render "form", form_url: admin_answer_path(@answer) %>
+  <%= render "form", form_url: admin_question_answer_path(@question, @answer) %>
 </div>

app/views/admin/poll/questions/answers/show.html.erb

@@ -1,6 +1,6 @@
 <%= back_link_to %>
 
-<%= link_to t("admin.answers.show.edit"), edit_admin_answer_path(@answer),
+<%= link_to t("admin.answers.show.edit"), edit_admin_question_answer_path(@answer.question, @answer),
             class: "button hollow float-right" %>
 
 <ul class="breadcrumbs margin-top">

app/views/admin/poll/questions/show.html.erb

@@ -52,7 +52,7 @@
   <tbody class="sortable" data-js-url="<%= admin_question_answers_order_answers_path(@question.id) %>">
     <% @question.question_answers.each do |answer| %>
       <tr id="<%= dom_id(answer) %>" class="poll_question_answer" data-answer-id="<%= answer.id %>">
-        <td class="align-top"><%= link_to answer.title, admin_answer_path(answer) %></td>
+        <td class="align-top"><%= link_to answer.title, admin_question_answer_path(@question, answer) %></td>
         <td class="align-top break"><%= wysiwyg(answer.description) %></td>
         <td class="align-top text-center">
           (<%= answer.images.count %>)

config/routes/admin.rb

@@ -169,7 +169,8 @@ namespace :admin do
     end
 
     resources :questions, shallow: true do
-      resources :answers, except: [:index, :destroy], controller: "questions/answers" do
+      resources :answers, except: [:index, :destroy], controller: "questions/answers", shallow: false
+      resources :answers, only: [], controller: "questions/answers" do
         resources :images, controller: "questions/answers/images"
         resources :videos, controller: "questions/answers/videos"
         get :documents, to: "questions/answers#documents"

spec/system/admin/poll/questions/answers/answers_spec.rb

@@ -36,7 +36,7 @@ describe "Answers", :admin do
     answer = create(:poll_question_answer, question: question, title: "Answer title", given_order: 2)
     create(:poll_question_answer, question: question, title: "Another title", given_order: 1)
 
-    visit admin_answer_path(answer)
+    visit admin_question_answer_path(question, answer)
 
     click_link "Edit answer"
 

spec/system/admin/translatable_spec.rb

@@ -216,7 +216,7 @@ describe "Admin edit translatable records", :admin do
 
     context "CKEditor fields" do
       let(:translatable) { create(:poll_question_answer) }
-      let(:path) { edit_admin_answer_path(translatable) }
+      let(:path) { edit_admin_question_answer_path(translatable.question, translatable) }
 
       scenario "Changes the existing translation" do
         visit path