How to set up factory in FactoryBot with has_many association

Alternatively, you can use a block and skip the association keyword. This makes it possible to build objects without saving to the database (otherwise, a has_many association will save your records to the db, even if you use the build function instead of create).

FactoryGirl.define do
  factory :listing_with_features, :parent => :listing do |listing|
    features { build_list :feature, 3 }
  end
end