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