您如何编写迁移以在 Rails 中重命名 ActiveRecord 模型及其表? [英] How do you write a migration to rename an ActiveRecord model and its table in Rails?

问题描述

我在命名方面很糟糕，并意识到在我的 Rails 应用程序中有一组更好的模型名称.
有没有办法使用迁移来重命名模型及其对应的表?

I'm terrible at naming and realize that there are a better set of names for my models in my Rails app.
Is there any way to use a migration to rename a model and its corresponding table?

推荐答案

举个例子:

class RenameOldTableToNewTable < ActiveRecord::Migration
  def self.up
    rename_table :old_table_name, :new_table_name
  end

  def self.down
    rename_table :new_table_name, :old_table_name
  end
end

我不得不手动重命名模型声明文件.

I had to go and rename the model declaration file manually.

在 Rails 3.1 和4、ActiveRecord::Migration::CommandRecorder 知道如何反向 rename_table 迁移，所以你可以这样做:

In Rails 3.1 & 4, ActiveRecord::Migration::CommandRecorder knows how to reverse rename_table migrations, so you can do this:

class RenameOldTableToNewTable < ActiveRecord::Migration
  def change
    rename_table :old_table_name, :new_table_name
  end 
end

(您仍然需要手动重命名文件.)

(You still have to go through and manually rename your files.)

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