gistfile1.rb

Factory.define :account_with_users do |ac|
  ac.sequence(:name)      { |n| "Account#{n}" }
  ac.sequence(:subdomain) { |n| "subdomain#{n}" }
  ac.after_build do |account|
    account.users = [Factory.build(:user),Factory.build(:user)]
  end
end

Factory.define :user do |u|
  u.sequence(:name)     { |n| "John Doe #{n}" }
  u.sequence(:username) { |n| "user#{n}" }
  u.sequence(:email)    { |n| "email#{n}@example.com" }
  u.password "123mudar"
  u.password_confirmation { |u| u.password }
end

Factory.define :user_with_account, :parent => :user do |u|
  u.account {|u| u.association(:account) }
end