Extract documents action from Answer controller

This way we have a controller just to manage
Poll::Question::Answer related documents in the
same way we have for videos and images.

app/components/admin/poll/questions/answers/documents/index_component.html.erb

@@ -3,16 +3,13 @@
 <h2><%= t("admin.questions.show.answers.documents_list") %></h2>
 
 <ul class="breadcrumbs">
-  <li><%= @answer.question.title %></li>
-  <li><%= @answer.title %></li>
+  <li><%= answer.question.title %></li>
+  <li><%= answer.title %></li>
 </ul>
 
 <div class="poll-question-form">
-  <%= form_for(Poll::Question::Answer.new,
-              url: admin_question_answer_path(@answer.question, @answer),
-              method: :put) do |f| %>
-
-    <%= render "shared/errors", resource: @answer %>
+  <%= form_for(Poll::Question::Answer.new, url: admin_answer_documents_path(answer)) do |f| %>
+    <%= render "shared/errors", resource: answer %>
 
     <div class="documents">
       <%= render "documents/nested_documents", f: f %>
@@ -23,14 +20,14 @@
     </div>
   <% end %>
 
-  <% if @answer.documents.present? %>
+  <% if answer.documents.present? %>
     <table>
       <tr>
         <th scope="col"><%= t("admin.questions.show.answers.document_title") %></th>
         <th scope="col"><%= t("admin.questions.show.answers.document_actions") %></th>
       </tr>
 
-      <% @answer.documents.each do |document| %>
+      <% answer.documents.each do |document| %>
         <tr>
           <td>
             <%= link_to document.title, document.attachment %>

app/components/admin/poll/questions/answers/documents/index_component.rb

@@ -0,0 +1,7 @@
+class Admin::Poll::Questions::Answers::Documents::IndexComponent < ApplicationComponent
+  attr_reader :answer
+
+  def initialize(answer)
+    @answer = answer
+  end
+end

app/controllers/admin/poll/questions/answers/documents_controller.rb

@@ -0,0 +1,29 @@
+class Admin::Poll::Questions::Answers::DocumentsController < Admin::Poll::BaseController
+  include DocumentAttributes
+
+  load_and_authorize_resource :answer, class: "::Poll::Question::Answer"
+
+  def index
+  end
+
+  def create
+    @answer.attributes = documents_params
+
+    if @answer.save
+      redirect_to admin_answer_documents_path(@answer),
+        notice: t("admin.documents.create.success_notice")
+    else
+      render :new
+    end
+  end
+
+  private
+
+    def documents_params
+      params.require(:poll_question_answer).permit(allowed_params)
+    end
+
+    def allowed_params
+      [documents_attributes: document_attributes]
+    end
+end

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

@@ -1,12 +1,10 @@
 class Admin::Poll::Questions::AnswersController < Admin::Poll::BaseController
   include Translatable
-  include DocumentAttributes
 
   load_and_authorize_resource :question, class: "::Poll::Question"
   load_and_authorize_resource class: "::Poll::Question::Answer",
                               through: :question,
-                              through_association: :question_answers,
-                              except: :documents
+                              through_association: :question_answers
 
   def new
   end
@@ -35,13 +33,6 @@ class Admin::Poll::Questions::AnswersController < Admin::Poll::BaseController
     end
   end
 
-  def documents
-    @answer = ::Poll::Question::Answer.find(params[:answer_id])
-    @documents = @answer.documents
-
-    render "admin/poll/questions/answers/documents"
-  end
-
   def order_answers
     ::Poll::Question::Answer.order_answers(params[:ordered_list])
     head :ok
@@ -54,7 +45,7 @@ class Admin::Poll::Questions::AnswersController < Admin::Poll::BaseController
     end
 
     def allowed_params
-      attributes = [:title, :description, :given_order, documents_attributes: document_attributes]
+      attributes = [:title, :description, :given_order]
 
       [*attributes, translation_params(Poll::Question::Answer)]
     end

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

@@ -0,0 +1 @@
+<%= render Admin::Poll::Questions::Answers::Documents::IndexComponent.new(@answer) %>

config/routes/admin.rb

@@ -173,7 +173,7 @@ namespace :admin do
       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"
+        resources :documents, only: [:index, :create], controller: "questions/answers/documents"
       end
       post "/answers/order_answers", to: "questions/answers#order_answers"
     end

spec/system/admin/poll/questions/answers/documents/documents_spec.rb

@@ -21,6 +21,18 @@ describe "Documents", :admin do
     end
   end
 
+  scenario "Create document for answer" do
+    answer = create(:poll_question_answer)
+
+    visit admin_answer_documents_path(answer)
+
+    documentable_attach_new_file(Rails.root.join("spec/fixtures/files/clippy.pdf"))
+    click_button "Save"
+
+    expect(page).to have_content "Document uploaded succesfully"
+    expect(page).to have_link "clippy.pdf"
+  end
+
   scenario "Remove document from answer" do
     answer = create(:poll_question_answer)
     document = create(:document, documentable: answer)