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我是轨道新手。我使用以下class User及其class Teacher < User子类创建 STI。当我填写用户表单时，它抛出了一个错误。

/users 处的名称错误

未初始化的常量 User::teacher

app/controllers/users_controller.rb，第 29 行

   24     end
   25   
   26     # POST /users
   27     def create 
   28       byebug 
>  29       @user = User.new(user_params) 
   30       authorize @user    
   31       if @user.save
   32         render json: @user, status: :created, location: @user, serializer: UserSerializer
   33       else
   34         render json: @user.errors, status: :unprocessable_entity

应用回溯

  • app/controllers/users_controller.rb:29:in `create'

完整回溯

activerecord (6.0.1) lib/active_record/inheritance.rb:206:in    `compute_type'
activerecord (6.0.1) lib/active_record/inheritance.rb:233:in `find_sti_class'
activerecord (6.0.1) lib/active_record/inheritance.rb:263:in `subclass_from_attributes'
activerecord (6.0.1) lib/active_record/inheritance.rb:56:in `new'
app/controllers/users_controller.rb:29:in `create'
actionpack (6.0.1) lib/action_controller/metal/basic_implicit_render.rb:6:in    `send_action'
actionpack (6.0.1) lib/abstract_controller/base.rb:196:in `process_action'
actionpack (6.0.1) lib/action_controller/metal/rendering.rb:30:in `process_action'
actionpack (6.0.1) lib/abstract_controller/callbacks.rb:42:in `block in process_action'
activesupport (6.0.1) lib/active_support/callbacks.rb:135:in `run_callbacks'
actionpack (6.0.1) lib/abstract_controller/callbacks.rb:41:in `process_action'
actionpack (6.0.1) lib/action_controller/metal/rescue.rb:22:in `process_action'
actionpack (6.0.1) lib/action_controller/metal/instrumentation.rb:33:in `block in    process_action'
activesupport (6.0.1) lib/active_support/notifications.rb:180:in `block in instrument'
activesupport (6.0.1) lib/active_support/notifications/instrumenter.rb:24:in `instrument'
activesupport (6.0.1) lib/active_support/notifications.rb:180:in `instrument'
actionpack (6.0.1) lib/action_controller/metal/instrumentation.rb:32:in `process_action'
actionpack (6.0.1) lib/action_controller/metal/params_wrapper.rb:245:in `process_action'
activerecord (6.0.1) lib/active_record/railties/controller_runtime.rb:27:in    `process_action'
actionpack (6.0.1) lib/abstract_controller/base.rb:136:in `process'
actionpack (6.0.1) lib/action_controller/metal.rb:191:in `dispatch'
actionpack (6.0.1) lib/action_controller/metal.rb:252:in `dispatch'
actionpack (6.0.1) lib/action_dispatch/routing/route_set.rb:51:in `dispatch'
actionpack (6.0.1) lib/action_dispatch/routing/route_set.rb:33:in `serve'
actionpack (6.0.1) lib/action_dispatch/journey/router.rb:49:in `block in serve'
actionpack (6.0.1) lib/action_dispatch/journey/router.rb:32:in `serve'
actionpack (6.0.1) lib/action_dispatch/routing/route_set.rb:837:in `call'

我想我错过了将字符串参数常量化为实际类常量的部分。怎么做？

请指导。谢谢

4

2 回答 2

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正如 Paula Fidalgo 所说，确保您在用户模型模式中将类型列作为字符串

之后，您可以在 User 模型中创建新条目，如下所示

Teacher.create(user_params)

User.create(type: 'Teacher')

两者都是一样的。

于 2020-01-04T05:00:59.770 回答
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通过查看uninitialized constant User::teacher您似乎在某处使用较低版本，确保您在数据库中也有一个类型。它应该是User::Teacher

于 2019-12-10T00:01:35.673 回答