User custom method for services array

app/models/project.rb

@@ -47,7 +47,6 @@ class Project < ActiveRecord::Base
   has_many :wikis,          dependent: :destroy
   has_many :protected_branches, dependent: :destroy
   has_one :last_event, class_name: 'Event', order: 'events.created_at DESC', foreign_key: 'project_id'
-  has_many :services, dependent: :destroy
   has_one :gitlab_ci_service, dependent: :destroy
   delegate :name, to: :owner, allow_nil: true, prefix: true
@@ -185,4 +184,8 @@ class Project < ActiveRecord::Base
   def issues_labels
     issues.tag_counts_on(:labels)
   end
+
+  def services
+    [gitlab_ci_service].compact
+  end
 end