mysql - 在 Rails 中迁移期间重命名列时出错

Question

我尝试在 Rails 中运行迁移来更改列的名称，但收到此错误:

Mysql::Error: Error on rename of './databasename/#sql-478_17b' to './databasename/zz_portal_users' (errno: 150): ALTER TABLE `zz_portal_users` CHANGE `user_id` `zz_user_id` int(11) DEFAULT NULL

这是我尝试运行的迁移:

class RenameUsersIdToZzUsersIdInZzPortalUsers < ActiveRecord::Migration
  def self.up
    rename_column :zz_portal_users, :user_id, :zz_user_id
  end

  def self.down
    rename_column :zz_portal_users, :zz_user_id, :user_id
  end
end

知道这可能来自哪里吗？

谢谢!

Answer 1

来自MySQL documentation

If ALTER TABLE dies with the following error, the problem may be that MySQL crashed during an earlier ALTER TABLE operation and there is an old table named A-xxx or B-xxx lying around:

Error on rename of './database/name.frm' to './database/B-xxx.frm' (Errcode: 17) In this case, go to the MySQL data directory and delete all files that have names starting with A- or B-. (You may want to move them elsewhere instead of deleting them.)