class AddAttachmentAvatarToPapers < ActiveRecord::Migration def self.up add_column :papers, :avatar_file_name, :string add_column :papers, :avatar_content_type, :string add_column :papers, :avatar_file_size, :integer add_column :papers, :avatar_updated_at, :datetime end def self.down remove_column :papers, :avatar_file_name remove_column :papers, :avatar_content_type remove_column :papers, :avatar_file_size remove_column :papers, :avatar_updated_at end end