Add separate post migration to change default of notified_of_own_activity

db/migrate/20170316061730_readd_notified_of_own_activity_to_users.rb

@@ -5,7 +5,7 @@ class ReaddNotifiedOfOwnActivityToUsers < ActiveRecord::Migration
   DOWNTIME = false
 
   def up
-    add_column_with_default :users, :notified_of_own_activity, :boolean, default: false
+    add_column :users, :notified_of_own_activity, :boolean
   end
 
   def down

db/post_migrate/20170317131326_add_notified_of_own_activity_default.rb

+class AddNotifiedOfOwnActivityDefault < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+  disable_ddl_transaction!
+
+  DOWNTIME = false
+
+  def up
+    begin
+      update_column_in_batches(:users, :notified_of_own_activity, false) do |table, query|
+        query.where(table[:notified_of_own_activity].eq(nil))
+      end
+
+      change_column :users, :notified_of_own_activity, :boolean, default: false, null: false
+    end
+  end
+
+  def down
+    change_column_default :users, :notified_of_own_activity, nil
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20170316061730) do
+ActiveRecord::Schema.define(version: 20170317131326) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"