Rails使用Parent错误合并子错误

I've got the following two (sanitized/stylized) models:

我有以下两种（消毒/程式化）模型：

 class DrivingExam < ActiveRecord::Base
   belongs_to :dmv_rules
   has_many :invigilator_assignments, as: :assignable
   has_many :invigilator, through: :invigilator_assignments

   validate do |record|
     record.invigilator_assignments.each do |i|
       next if i.valid?
       i.errors.full_messages.each do |msg|
         errors.add_to_base(msg)
       end
     end
   end
 end



 class InvigilatorAssignment  < ActiveRecord::Base
   attr_accessible :invigilator_id

   belongs_to :assignable, polymorphic: true
   belongs_to :invigilator

   validates :invigilator_id, presence: true

   validates_each :invigilator do |record, attr, value|
     if record.assignable.is_a?(DrivingExam) && !value.no_scheduling_conflicts?
       record.errors.add attr, "This Invigilator has a scheduling conflict"
     end

   end
 end

These get called from the DrivingExamController by way of:

这些通过以下方式从DrivingExamController调用：

 if @driving_exam.save

The expected behaviour is that the model should return false on the validation and join the child messages into the parent errors hash and pass this up to the controller.

预期的行为是模型应该在验证时返回false并将子消息加入父错误哈希并将其传递给控制器。

What happens instead is that the page fails to save (this is good) with a 422(this is weird) and does not pass the messages.

相反的是，页面无法使用422（这很奇怪）保存（这很好）并且不传递消息。

By adding puts statements throughout the above code, I have established that:

通过在上面的代码中添加puts语句，我已经建立了：

1) The if condition within validates_each is successful, and the record.errors array is thus set inside the InvigilatorAssignment model.

1）validates_each中的if条件成功，因此在InvigilatorAssignment模型中设置了record.errors数组。

2) In the validate do loop the invigilator assignment is valid and has no errors

2）在验证执行循环中，监考人员分配有效且没有错误

3) the validate do loop runs before the validates_each loop

3）validate do循环在validates_each循环之前运行

So the question is: How do I ensure that the DrivingExam validates InvigilatorAssignment and merges its error messages onto its own error hash.

所以问题是：我如何确保DrivingExam验证InvigilatorAssignment并将其错误消息合并到其自己的错误哈希中。

1 个解决方案

#1

Refer to this question on * :

请参阅*上的这个问题：

Ruby on Rails: how to get error messages from a child resource displayed?

Ruby on Rails：如何从显示的子资源中获取错误消息？

It is similar to what you want.

它类似于你想要的。

#1