gistfile1.rb

# Trial URL
class TrialUrl < ActiveRecord::Base
  scope :for_sales_rep, ->(sales_rep_id) { where(sales_rep_id: sales_rep_id) } 
  belongs_to :sales_rep, class_name: "OleCore::Login", foreign_key: "sales_rep_id" 
end

# Login
module OleCore
  Login.class_eval do
   
   def url
    trial_url = ::TrialUrl.for_sales_rep(self.id).first
    return unless trial_url
      
    trial_url.url
  end
end