Question

Everything was working as expected, until I upgraded to Rails 3.2.11.

This is how my models are setup :

class Student < ActiveRecord::Base
    has_many :institutes
    has_many :teachers, :through => :institutes
end

class Teacher < ActiveRecord::Base
    has_many :institutes
    has_many :students, :through => :institutes
end

class Institute < ActiveRecord::Base
    belongs_to :teachers
    belongs_to :students
    validates :teacher_id, :presence => true
    validates :student_id, :uniqueness => {:scope  => :teacher_id}, :presence => true
end

My factories.rb file looks like this :

factory :student do
    first_name "abc"
    last_name "xyz"
    teachers {|t| [t.association(:teacher)] }
end

factory :teacher do
    first_name "ABC"
    last_name "XYZ"
end

factory :institute do
    association :student
    association :teacher
end

---

The Problem :

When I do :

FactoryGirl.create(:student)

It gives me the following error :

ActiveRecord::RecordInvalid: Validation failed: Institutes is invalid

It seems like, it creates :teacher, then :institute and finally :student. Therefore, it doesn’t have the student_id when it creates :institute, making it invalid.

The weird thing is, the same model and factory_girl setup was working fine with Rails 3.2.8.

How can I fix this ?

Answer 1

What about somthing like this

factory :student do |student|  
  ...
  student.after_create do |student|  
    student.teachers << :teacher  
  end  
end