Question

I have a Customer model where each customer has many jobs:

class Customer < ActiveRecord::Base
  has_many :jobs
end

class Job < ActiveRecord::Base
  belongs_to :customer

  def self.unbilled
    finished.uninvoiced # these are other scopes on Job
  end
end

How do I define a scope on Customer which will return a list of all customers who have unbilled jobs?

Answer 1

You may be able to merge the scopes:

class Customer < ActiveRecord::Base
  has_many :jobs

  scope :freeloaders, joins(:jobs).merge(Job.unbilled)
end