FactoryGirl and polymorphic associations

Although there is an accepted answer, here is some code using the new syntax which worked for me and might be useful to someone else.

spec/factories.rb

FactoryGirl.define do  factory :musical_user, class: "User" do    association :profile, factory: :musician    #attributes for user  end  factory :artist_user, class: "User" do    association :profile, factory: :artist    #attributes for user  end  factory :artist do    #attributes for artist  end  factory :musician do    #attributes for musician  endend

spec/models/artist_spec.rb

before(:each) do  @artist = FactoryGirl.create(:artist_user)end

Which will create the artist instance as well as the user instance. So you can call:

@artist.profile

to get the Artist instance.

Use traits like this;

FactoryGirl.define do    factory :user do        # attributes_for user        trait :artist do            association :profile, factory: :artist        end        trait :musician do            association :profile, factory: :musician        end    endend

now you can get user instance by FactoryGirl.create(:user, :artist)

Factory_Girl callbacks would make life much easier. How about something like this?

Factory.define :user do |user|  #attributes for userendFactory.define :artist do |artist|  #attributes for artist  artist.after_create {|a| Factory(:user, :profile => a)}endFactory.define :musician do |musician|  #attributes for musician  musician.after_create {|m| Factory(:user, :profile => m)}end