在Ruby on Rails中一次性更改模型属性（列名） [英] One time change model attribute (column name) in Ruby on Rails

问题描述

我创建了一个具有属性name的模型，但我想将其更改为username。我读过的关于数据库迁移的一切都涉及创建一个类或一些复杂的东西。我所要做的就是在SQL中相当于UPDATE TABLE。如何运行一次性数据库迁移来更改此？

I created a model with an attribute "name" but I want to change it to "username". Everything I've read about database migrations involves creating a class or some complicated stuff. All I want to do is the equivalent of "UPDATE TABLE" in SQL. How do you run a one-time database migration to change this? I'm guessing it'd involve rails console and then some command?

推荐答案

首先：

rails g migration rename_name_column_to_username

在生成的rename_name_column_to_username.rb迁移文件中：

Then in the generated rename_name_column_to_username.rb migration file:

class RenameNameColumnToUsername < ActiveRecord::Migration
  def self.up
    rename_column :users, :name, :username
  end

  def self.down
    rename_column :users, :username, :name
  end
end

然后 rake db：migrate

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