Test validation that makes sure record is associated to records only owned by parent with spec

Question

I have model Category which has and belongs to many Packages. When a user creates a Posting in a Category, it must belong to a Package that is in its category.

Here's the code for the custom validator:

class PackageValidator < ActiveModel::Validator
  def validate(record)
    record.errors[:package_id] <<
      I18n.t('errors.messages.package.not_in_category') unless
      record.category.packages.include? record.package
  end
end

This works great and all, but it breaks all my rspec tests (with factory_girl) because factory_girl creates a new Package for each Category and Posting I build/create with it.

Here's my factories:

factory :category do
  sequence(:name) {|n| "Parts#{n}"}
  sequence(:slug) {|n| "parts#{n}"}
  packages {[FactoryGirl.create(:package)]}
end

factory :posting do
  title 'Foo'
  body 'Bar'
  category
  package
end

factory :package do
  sequence(:name) {|n| "Basic#{n}"
  price 0
  photos 5
end

How can I make it all play nicely together?

Answer 1

You can set the package to category.packages.first in an after(:build) hook.