在工厂中获得两个关联以共享另一个关联 [英] Get two associations within a Factory to share another association

问题描述

我有以下5个模型:监护人，学生，人际关系，RelationshipType和School.他们之间，我有这些关联

I've got these 5 models: Guardian, Student, Relationship, RelationshipType and School. Between them, I've got these associations

class Guardian < ActiveRecord::Base
  belongs_to :school
  has_many :relationships, :dependent => :destroy
  has_many :students, :through => :relationships
end

class Student < ActiveRecord::Base
  belongs_to :school
  has_many :relationships, :dependent => :destroy
  has_many :guardians, :through => :relationships
end

class Relationship < ActiveRecord::Base
  belongs_to :student
  belongs_to :guardian
  belongs_to :relationship_type
end

class School < ActiveRecord::Base
  has_many :guardians, :dependent => :destroy
  has_many :students, :dependent => :destroy
end

class RelationshipType < ActiveRecord::Base
  has_many :relationships
end

我想写一个定义关系的FactoryGirl.每个关系都必须有一名监护人和一名学生.这两个必须属于同一所学校.监护工厂与学校有联系，学生工厂也与学校有联系.我一直无法让它们在同一所学校建造.我有以下代码:

I want to write a FactoryGirl which defines a relationship. Every relationship must have a guardian and a student. These two must belong to the same school. The guardian factory has an association with school, and so does the student factory. I've been unable to get them to be built in the same school. I've got the following code:

FactoryGirl.define do

  factory :relationship do
    association :guardian
    association :student, :school => self.guardian.school
    relationship_type RelationshipType.first
  end

end

当我尝试使用此工厂建立关系时，这会导致以下错误:

This results in the following error when I try to build a relationship using this factory:

undefined method `school' for #<FactoryGirl::Declaration::Implicit:0x0000010098af98> (NoMethodError)

有什么办法可以做我想要的事情，使监护人和学生属于同一所学校，而不必求助于将已经创建的监护人和学生送到工厂去(这不是它的目的)?

Is there any way to do what I want, to make the guardian and the student belong to the same school without having to resort to passing already created guardians and students to the factory (which is not its purpose)?

推荐答案

我认为这应该有效:

FactoryGirl.define do
  factory :relationship do 
    association :guardian
    relationship_type RelationshipType.first
    after_build do |relationship|
      relationship.student = Factory(:student, :school => relationship.guardian.school)
    end
  end
end

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