2

我在各种类型的事件和许多事件has_many_polymorphs之间有关系。Candidate特别是，a 在创建时Candidate会创建一个Created事件。

class Candidate < ActiveRecord::Base
  has_many_polymorphs :events, :through => :candidate_events,
                               :from => Event::Base.included_in_classes.map { |klass|
                                 klass.to_s.underscore.pluralize.to_sym
                               })
  after_validation_on_create :create_created_event

  private
  def create_creation_event
    Event::Created.create!(:candidate => self, :creator => creator)
  end
end

class CandidateEvent < ActiveRecord::Base
  belongs_to :candidate
  belongs_to :event, :polymorphic => true
end

module Event::Base
  ...
end

class Event::Created < ActiveRecord::Base
  include Event::Base
  validates_presence_of :creator
end

当我运行单元测试时，一切都很好。当我运行我的功能测试时，一切都很好。当我运行我的集成（Cucumber）测试时，一切都很好。当我在生产中运行时，一切都很好。当我尝试在开发模式下运行（打开类重新加载）时，我得到

Referential integrity violation; child <Event::Created:1> was not found for :events.
Expected record['candidate_events.event_id'] (1) to be equal to record['created_events.id'] ().
  {
    "candidate_events.event_type"=>"Event::Created",
    "candidate_events.created_at"=>"2009-08-05 20:28:31",
    "candidate_events.updated_at"=>"2009-08-05 20:28:31",
    "candidate_events.candidate_id"=>"1",
    "candidate_events.event_id"=>"1",
    "candidate_events.id"=>"1"
  }

在相同（开发）环境中运行script/console，我看到该Event::Created对象与CandidateEvent交叉引用模型具有适当的关系。

这是怎么回事？

4

1 回答 1

2

我们能否确定 Event::Base.included_in_classes 在类重新加载时返回正确的类？这种技巧不是依赖于加载顺序吗？即也许 Event::Created 还没有包含 Event::Base？

于 2009-08-05T22:11:12.140 回答