具有carrierwave迁移错误的rails：未定义的方法`attachment'

Question

我正在使用carrierwave gem（版本0.8.0）。当我做'rake db：migrate'时，我看到了一个奇怪的错误：

    ==  AddAttachmentLogoToMerchants: migrating ===================================
    -- change_table(:merchants)
    rake aborted!
    An error has occurred, this and all later migrations canceled:

    undefined method `attachment' for     ActiveRecord::ConnectionAdapters::PostgreSQLAdapter::Table:0x007f900e6bde88

我的迁移：

      def self.up
        change_table :merchants  do |t|
          t.attachment :logo
        end
        remove_column :merchants, :logo_filename
      end

      def self.down
        add_column :merchants, :logo_filename, :string
        drop_attached_file :merchants, :logo
      end

我该如何解决？

Answer 1

t.attachment attachment中的AFAIK应为数据类型

change_table :merchants  do |t|
  t.attachment :logo
end

请click here查找postgresql的数据类型列表 如果你想要字符串跟随应该工作

change_table :merchants  do |t|
  t.string :logo
end