class RemoveLastLoginFromHistory722 < ActiveRecord::Migration[4.2] def up # return if it's a new setup return if !Setting.exists?(name: 'system_init_done') history_object = History.object_lookup('User') return if !history_object history_attribute = History.attribute_lookup('last_login') return if !history_attribute History.where(history_object_id: history_object.id, history_attribute_id: history_attribute.id).delete_all end end