Disable self-notification possibility

closes #6512

app/models/notification.rb

@@ -15,7 +15,7 @@ class Notification < ActiveRecord::Base
   end
 
   def self.notify(recipient, target, actor)
-    return nil unless target.respond_to? :notification_type
+    return nil unless target.respond_to?(:notification_type) && recipient.person != actor
 
     note_type = target.notification_type(recipient, actor)
     return nil unless note_type

spec/models/notification_spec.rb

@@ -73,6 +73,11 @@ describe Notification, :type => :model do
         Notification.notify(@user, @request, @person)
       end
 
+      it "does nothing if told to notify oneself" do
+        notification = Notification.notify(@user, @request, @user.person)
+        expect(notification).to eq(nil)
+      end
+
       describe '#emails_the_user' do
         it 'calls mail' do
           opts = {