在 Rails 5 中添加引用列迁移 [英] Add a reference column migration in Rails 5

问题描述

一个用户有很多上传.我想在引用用户的上传表中添加一列.迁移应该是什么样的?

A user has many uploads. I want to add a column to the uploads table that references the user. What should the migration look like?

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推荐答案

与之前版本的 Rails 一样，您可以使用以下命令来创建迁移:

As with prior versions of Rails, you may use the following command to create the migration:

rails g 迁移 AddUserToUploads user:references

与以前版本的 Rails 不同，迁移看起来像:

Unlike prior versions of Rails, the migration looks like:

class AddUserToUploads < ActiveRecord::Migration[5.0]
  def change
    add_reference :uploads, :user, foreign_key: true
  end
end

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