Implement unsubscribe route to delete subscriptions

app/controllers/subscriptions_controller.rb

@@ -18,6 +18,34 @@ class SubscriptionsController < ApplicationController
     authorize!
   end
 
+  # DELETE /subscriptions/1
+  # DELETE /subscriptions/1.json
+  def destroy
+    begin
+      @subscription = Subscription.find(params[:id])
+    rescue
+      skip_authorization
+      respond_to do |format|
+        format.html { redirect_to request_for_comments_url, alert: t('subscriptions.subscription_not_existent') }
+        format.json { head :internal_server_error }
+      end
+    else
+      authorize!
+      rfc = @subscription.try(:request_for_comment)
+      if @subscription.destroy
+        respond_to do |format|
+          format.html { redirect_to request_for_comment_url(rfc), notice: t('subscriptions.successfully_unsubscribed') }
+          format.json { head :destroyed }
+        end
+      else
+        respond_to do |format|
+          format.html { redirect_to request_for_comment_url(rfc), :flash => { :danger => t('shared.message_failure') } }
+          format.json { head :internal_server_error }
+        end
+      end
+    end
+  end
+
   def set_subscription
     @subscription = Subscription.find(params[:id])
     authorize!

app/policies/subscription_policy.rb

@@ -2,4 +2,17 @@ class SubscriptionPolicy < ApplicationPolicy
   def create?
     everyone
   end
+
+  def destroy?
+    author? || admin?
+  end
+
+  def show_error?
+    everyone
+  end
+
+  def author?
+    @user == @record.user
+  end
+  private :author?
 end

config/locales/de.yml

@@ -630,4 +630,7 @@ de:
   comments:
     deleted: "Gelöscht"
     save_update: "Speichern"
+  subscriptions:
+    successfully_unsubscribed: "Ihr Abonnement für weitere Kommentare auf dieser Kommentaranfrage wurde erfolgreich beendet."
+    subscription_not_existent: "Das Abonnement, von dem Sie sich abmelden wollen, existiert nicht."
 

config/locales/en.yml

@@ -651,3 +651,6 @@ en:
   comments:
     deleted: "Deleted"
     save_update: "Save"
+  subscriptions:
+    successfully_unsubscribed: "You successfully unsubscribed from this Request for Comment"
+    subscription_not_existent: "The subscription you want to unsubscribe from does not exist."

config/routes.rb

@@ -21,7 +21,11 @@ Rails.application.routes.draw do
   delete '/comment_by_id', to: 'comments#destroy_by_id'
   put '/comments', to: 'comments#update'
 
-  resources :subscriptions
+  resources :subscriptions do
+    member do
+      get :unsubscribe, to: 'subscriptions#destroy'
+    end
+  end
 
   root to: 'application#welcome'