定义rails迁移方法的适当位置在哪里？

Question

我想定义一个简单的方法，当通过迁移删除特定表时，获得用户输入的确认，如下所示。

  def confirm_drop(table)
    if table_exists?(table)
      puts "Warning: Did not drop table to protect data."
      puts "Drop the table？ [y]es | [n]o | [c]ancel"
      answer = STDIN.gets.chomp
      if (answer == "y" or answer == "yes")
        drop_table :table
      elsif (answer == "c" or answer == "cancel")
        raise exception "Canceled Migration"
      elsif (answer != "n" or answer == "no")
        raise exception "Input was something other than. [y]es | [n]o | [c]ancel"
      end
    end
  end

Answer 1

我不建议根据用户输入进行迁移，因为它可能在开发中可以正常运行，但在发布到生产环境时则不能。尤其是在使用CI服务器的情况下。