How to create has_and_belongs_to_many associations in Factory girl

Question

Given the following

class User < ActiveRecord::Base
  has_and_belongs_to_many :companies
end

class Company < ActiveRecord::Base
  has_and_belongs_to_m         


        

Answer 1

For HABTM I used traits and callbacks.

Say you have the following models:

class Catalog < ApplicationRecord
  has_and_belongs_to_many :courses
  …
end
class Course < ApplicationRecord
  …
end

You can define the Factory above:

FactoryBot.define do
  factory :catalog do
    description "Catalog description"
    …

    trait :with_courses do
      after :create do |catalog|
        courses = FactoryBot.create_list :course, 2

        catalog.courses << courses
        catalog.save
      end
    end
  end
end

Answer 2

  factory :company_with_users, parent: :company do

    ignore do
      users_count 20
    end

    after_create do |company, evaluator|
      FactoryGirl.create_list(:user, evaluator.users_count, users: [user])
    end

  end

Warning: Change users: [user] to :users => [user] for ruby 1.8.x

Answer 3

Factorygirl has since been updated and now includes callbacks to solve this problem. Take a look at http://robots.thoughtbot.com/post/254496652/aint-no-calla-back-girl for more info.

Answer 4

Here is the solution that works for me.

FactoryGirl.define do

  factory :company do
    #company attributes
  end

  factory :user do
   companies {[FactoryGirl.create(:company)]}
   #user attributes
  end

end

if you will need specific company you can use factory this way

company = FactoryGirl.create(:company, #{company attributes})
user = FactoryGirl.create(:user, :companies => [company])

Hope this will be helpful for somebody.

Answer 5

I couldn´t find an example for the above mentioned case on the provided website. (Only 1:N and polymorphic assocations, but no habtm). I had a similar case and my code looks like this:

Factory.define :user do |user|
 user.name "Foo Bar"
 user.after_create { |u| Factory(:company, :users => [u]) }
end

Factory.define :company do |c|
 c.name "Acme"
end

Answer 6

In my opinion, Just create two different factories like:

 Factory.define :user, :class => User do |u|
  # Just normal attributes initialization
 end

 Factory.define :company, :class => Company do |u|
  # Just normal attributes initialization
 end

When you write the test-cases for user then just write like this

 Factory(:user, :companies => [Factory(:company)])

Hope it will work.