Chris@1115: class ChangeAttachmentsContainerDefaults < ActiveRecord::Migration
Chris@1115:   def self.up
Chris@1115:     # Need to drop the index otherwise the following error occurs in Rails 3.1.3:
Chris@1115:     #
Chris@1115:     # Index name 'temp_index_altered_attachments_on_container_id_and_container_type' on
Chris@1115:     # table 'altered_attachments' is too long; the limit is 64 characters
Chris@1115:     remove_index :attachments, [:container_id, :container_type]
Chris@1115: 
Chris@1115:     change_column :attachments, :container_id, :integer, :default => nil, :null => true
Chris@1115:     change_column :attachments, :container_type, :string, :limit => 30, :default => nil, :null => true
Chris@1517:     Attachment.where("container_id = 0").update_all("container_id = NULL")
Chris@1517:     Attachment.where("container_type = ''").update_all("container_type = NULL")
Chris@1115: 
Chris@1115:     add_index :attachments, [:container_id, :container_type]
Chris@1115:   end
Chris@1115: 
Chris@1115:   def self.down
Chris@1115:     remove_index :attachments, [:container_id, :container_type]
Chris@1115: 
Chris@1115:     change_column :attachments, :container_id, :integer, :default => 0, :null => false
Chris@1115:     change_column :attachments, :container_type, :string, :limit => 30, :default => "", :null => false
Chris@1115: 
Chris@1115:     add_index :attachments, [:container_id, :container_type]
Chris@1115:   end
Chris@1115: end