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

  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