Add subscription controller

app/controllers/subscription_controller.rb

@@ -0,0 +1,20 @@
+class SubscriptionController < ApplicationController
+
+  def authorize!
+    authorize(@submission || @submissions)
+  end
+  private :authorize!
+
+  def set_subscription
+    @subscription = Subscription.find(params[:id])
+    authorize!
+  end
+  private :set_subscription
+
+  def subscription_params
+    current_user_id = current_user.try(:id)
+    current_user_class_name = current_user.try(:class).try(:name)
+    params[:subscription].permit(:request_for_comment, :type).merge(user_id: current_user_id, user_type: current_user_class_name)
+  end
+  private :subscription_params
+end

test/controllers/subscription_controller_test.rb

@@ -0,0 +1,7 @@
+require 'test_helper'
+
+class SubscriptionControllerTest < ActionController::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end