Make Rubocop happy

app/models/geo/event_log.rb

@@ -2,6 +2,8 @@ module Geo
   class EventLog < ActiveRecord::Base
     include Geo::Model
 
+    delegate :project_id, to: :event, allow_nil: true
+
     belongs_to :repository_updated_event,
       class_name: 'Geo::RepositoryUpdatedEvent',
       foreign_key: :repository_updated_event_id
@@ -19,9 +21,5 @@ module Geo
         repository_deleted_event ||
         repository_renamed_event
     end
-
-    def project_id
-      event&.project_id
-    end
   end
 end

db/migrate/20170717213940_create_geo_node_group_links.rb

@@ -3,6 +3,8 @@ class CreateGeoNodeGroupLinks < ActiveRecord::Migration
 
   DOWNTIME = false
 
+  disable_ddl_transaction!
+
   def change
     create_table :geo_node_group_links do |t|
       t.references :geo_node, index: true, foreign_key: { on_delete: :cascade }, null: false
@@ -11,6 +13,6 @@ class CreateGeoNodeGroupLinks < ActiveRecord::Migration
 
     add_timestamps_with_timezone :geo_node_group_links
 
-    add_foreign_key :geo_node_group_links, :namespaces, column: :group_id, on_delete: :cascade
+    add_concurrent_foreign_key :geo_node_group_links, :namespaces, column: :group_id, on_delete: :cascade
   end
 end