factory_girl (4.2.0) many-to-many relationship

factory-bot, rspec, ruby-on-rails, ruby-on-rails-3.2, tdd

Solution

For me it lookes like you have to make the `has_many` associations for `Registrations` and `Users` through `UserRegistrations`. This would then look like

    factory :user_registration do
       association :user
       association :registration
    end

    factory :user do
       ..setup for email and password

       factory :user_with_registrations do

          ignore do
            registrations_count 1
          end

          after(:create) do |user, evaluator|
            FactoryGirl.create_list(:user_registration, evaluator.registrations_count, user: user)
          end
       end
    end

    factory :registration do
       ..setup for registration

       factory :registration_with_user do

          ignore do
            users_count 1
          end

          after(:create) do |registration, evaluator|
            FactoryGirl.create_list(:user_registration, evaluator.users_count, registration: registration)
          end
       end
    end

Problem

I want to properly establish a many-to-many factory set using FactoryGirl 4.2.0. I keep running into documentation/examples with outdated syntax from previous FactoryGirl versions mixed together and it just isn't working for me. How do I set up this scenario given the following two resources and their linking table: ``` class User < ActiveRecord::Base has_many :user_registrations has_many :registrations, through: :user_registrations end class UserRegistration < ActiveRecord::Base belongs_to :user belongs_to :registration end class Registration < ActiveRecord::Base has_many :user_registrations has_many :users, through: :user_registrations end ``` This is what I have so far, as per the documentation found here. This is as close as I've come so far into any real progress. ``` FactoryGirl.define do factory :registration do user end factory :user, class: User do sequence(:email) { |n| "foo#{n}@example.com" } password "password" factory :user_with_registrations do ignore do registrations_count 1 end after(:create) do |user, evaluator| registrations FactoryGirl.create_list(:registration, evaluator.registrations_count, user: user) end end end end ``` Which fails in the following manner, which I realize is because this setup is stated to be for a one-to-many relationship. ``` 1) User Login Success Failure/Error: user = FactoryGirl.create(:user_with_registrations) NoMethodError: undefined method `user=' for #<Registration:0x007fc48e2ca768> # ./spec/factories.rb:18:in `block (4 levels) in <top (required)>' ``` What is the correct way to define a factory set for the many-to-many scenario using the latest FactoryGirl syntax? (4.2.0) Thanks!

Original source