Cakehealth

user_spec.rb

class User < ActiveRecord::Base
  has_and_belongs_to_many :plans, :after_add => :add_enrollment
  has_many :enrollments  
  
  def coenroll_with(couser)    
    couser.plans.each do |p|
      plans << p
    end
  end
  
  def cousers
    conditions = ["enrollments.plan_id in (?)", plan_ids]
    conditions[0] += " AND enrollments.user_id <> ?"
    conditions << self.id
    User.all(:joins => :enrollments, :conditions => conditions)
  end

  private
  def add_enrollment(plan)
    enrollments.create(:plan => plan)
  end
  
end

class Plan < ActiveRecord::Base
  has_and_belongs_to_many :users
  has_many :enrollments
end

class Enrollment < ActiveRecord::Base
  belongs_to :user
  belongs_to :plan
end

describe User do
  it "should add a user to an enrollment" do
    plan = Plan.create(:name => "Aetna PPO")
    don = User.create(:name => "Don")
    don.plans << plan
    don.enrollments.size.should == 1
    betty = User.create(:name => "Betty")
    betty.coenroll_with(don)
    betty.enrollments.size.should == 1
    don.cousers.should include(betty)
  end
end