Send notification on update UserProject relation (access changed)

app/observers/users_project_observer.rb

@@ -2,4 +2,8 @@ class UsersProjectObserver < ActiveRecord::Observer
   def after_create(users_project)
     Notify.project_access_granted_email(users_project.id).deliver
   end
+
+  def after_update(users_project)
+    Notify.project_access_granted_email(users_project.id).deliver
+  end
 end

config/application.rb

@@ -23,7 +23,7 @@ module Gitlab
     # config.plugins = [ :exception_notification, :ssl_requirement, :all ]
 
     # Activate observers that should always be running.
-    config.active_record.observers = :mailer_observer, :activity_observer, :project_observer, :key_observer, :issue_observer, :user_observer, :system_hook_observer
+    config.active_record.observers = :mailer_observer, :activity_observer, :project_observer, :key_observer, :issue_observer, :user_observer, :system_hook_observer, :users_project_observer
 
     # Set Time.zone default to the specified zone and make Active Record auto-convert to this zone.
     # Run "rake -D time" for a list of tasks for finding time zone names. Default is UTC.

spec/observers/users_project_observer_spec.rb

@@ -24,4 +24,17 @@ describe UsersProjectObserver do
       subject.after_create(users_project)
     end
   end
+
+  describe "#after_update" do
+    it "should called when UsersProject updated" do
+      subject.should_receive(:after_update)
+      UsersProject.observers.enable :users_project_observer do
+        users_project.update_attribute(:project_access, 40)
+      end
+    end
+    it "should send email to user" do
+      Notify.should_receive(:project_access_granted_email).with(users_project.id).and_return(double(deliver: true))
+      subject.after_update(users_project)
+    end
+  end
 end