实验室

rails new test1 -d mysql
rails g scaffold User name
rails g migration AddTeacherToUsers #add_reference :users, :teacher, index: true 
rails g scaffold Lab name user:references
rails db:create db:migrate

系统消息

已创建数据库'test1_development'已创建数据库'test1_test' 20230416164900 CreateUsers：migrating == create_table（：users）0.1837s 20230416164900 CreateUsers：迁移（0.1839s）==
20230416164941添加教师到用户：migrating == add_reference（：users，：teacher，{：index=〉true}）0.4567s 20230416164941 AddTeacherToUsers：迁移（0.4568s）==
20230416165121 CreateLabs：migrating == create_table（：labs）0.4219s 20230416165121 CreateLabs：迁移（0.4221s）==

rails g migration AddTeacherToLabs teacher:references
vi apps/models/lab.rb # belongs_to :teacher, class_name: "User"
rails db:migrate

错误信息：

20230416165540添加教师到实验室：migrating == add_reference（：labs，：teacher，{：foreign_key=〉true}）rails aborted！StandardError：发生错误，所有后续迁移已取消：
错误提示：表'test1_development.teachers'不存在：显示完整字段从teachers/home/帕特里克/test1/db/migrate/20230416165540_add_teacher_to_labs.rb：3：in change' /home/patrick/test1/bin/rails:9:in〈top（required）〉' /home/patrick/test1/bin/spring：15：in <top (required)>' bin/rails:3:in load' bin/rails：3：in ' 原因：ActiveRecord：：StatementInvalid：错误提示：表'test1_development.teachers'不存在：显示完整字段从teachers/home/帕特里克/test1/db/migrate/20230416165540_add_teacher_to_labs.rb：3：inchange' /home/patrick/test1/bin/rails:9:in〈top（required）〉' /home/patrick/test1/bin/spring：15：in<top (required)>' bin/rails:3:inload' bin/rails：3：in'
原因：Mysql 2：：错误：表'test1_development.teachers'不存在/home/帕特里克/test1/db/migrate/20230416165540_add_teacher_to_labs.rb：3：in change' /home/patrick/test1/bin/rails:9:in〈top（required）〉' /home/patrick/test1/bin/spring：15：in <top (required)>' bin/rails:3:in load' bin/rails：3：in ' 原因：Mysql 2：：错误：无法创建表test1_development.labs（错误号：150“外键约束格式不正确”）/home/帕特里克/test1/db/migrate/20230416165540_add_teacher_to_labs.rb：3：inchange' /home/patrick/test1/bin/rails:9:in〈top（required）〉' /home/patrick/test1/bin/spring：15：in<top (required)>' bin/rails:3:inload' bin/rails：3：in'任务：TOP =〉db：migrate（使用--trace运行任务查看完整跟踪）

我该怎么做？谢谢你的帮助。