paper clip 使用
rails g paperclip user avatar
这样生成了一个migration file,下面这段是自动生成滴
01 class AddAttachmentAvatarToUser< ActiveRecord::Migration 02 def self.up 03 add_column :users, :avatar_file_name, :string 04 add_column :users, :avatar_content_type, :string 05 add_column :users, :avatar_file_size, :integer 06 add_column :users, :avatar_updated_at, :datetime 07 end 08 09 def self.down 10 remove_column :users, :avatar_file_name 11 remove_column :users, :avatar_content_type 12 remove_column :users, :avatar_file_size 13 remove_column :users, :avatar_updated_at 14 end 15 end声明：本文来自网络，不代表【好得很程序员自学网】立场，转载请注明出处：http://www.haodehen.cn/did43688