Add controller logic for subscription#create

app/controllers/subscriptions_controller.rb

@@ -0,0 +1,33 @@
+class SubscriptionsController < ApplicationController
+
+  def authorize!
+    authorize(@subscription || @subscriptions)
+  end
+  private :authorize!
+
+  # POST /subscriptions.json
+  def create
+    @subscription = Subscription.new(subscription_params)
+    respond_to do |format|
+      if @subscription.save
+        format.json { render json: @subscription, status: :created }
+      else
+        format.json { render json: @subscription.errors, status: :unprocessable_entity }
+      end
+    end
+    authorize!
+  end
+
+  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_comments, :subscription_type).merge(user_id: current_user_id, user_type: current_user_class_name)
+  end
+  private :subscription_params
+end