Refactor creating notification setting with defaults

app/controllers/projects_controller.rb

@@ -102,12 +102,7 @@ class ProjectsController < Projects::ApplicationController
           @membership = @project.team.find_member(current_user.id)
 
           if @membership
-            @notification_setting = current_user.notification_settings.find_or_initialize_by(source: @project)
-
-            unless @notification_setting.persisted?
-              @notification_setting.set_defaults
-              @notification_setting.save
-            end
+            @notification_setting = current_user.notification_settings.find_or_create_for(@project)
           end
         end
 

app/models/member.rb

@@ -163,12 +163,7 @@ class Member < ActiveRecord::Base
   end
 
   def create_notification_setting
-    notification_setting = user.notification_settings.find_or_initialize_by(source: source)
-
-    unless notification_setting.persisted?
-      notification_setting.set_defaults
-      notification_setting.save
-    end
+    user.notification_setting.find_or_create_for(source)
   end
 
   def notification_setting

app/models/notification_setting.rb

@@ -15,6 +15,17 @@ class NotificationSetting < ActiveRecord::Base
   scope :for_groups, -> { where(source_type: 'Namespace') }
   scope :for_projects, -> { where(source_type: 'Project') }
 
+  def self.find_or_create_for(source)
+    setting = find_or_initialize_by(source: source)
+
+    unless setting.persisted?
+      setting.set_defaults
+      setting.save
+    end
+
+    setting
+  end
+
   def set_defaults
     self.level = :global
   end