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- #---
- # Excerpted from "Agile Web Development with Rails",
- # published by The Pragmatic Bookshelf.
- # Copyrights apply to this code. It may not be used to create training material,
- # courses, books, articles, and the like. Contact us if you are in doubt.
- # We make no guarantees that this code is fit for any purpose.
- # Visit http://www.pragmaticprogrammer.com/titles/rails4 for more book information.
- #---
- $: << File.dirname(__FILE__)
- require "connect"
- require "logger"
- #ActiveRecord::Base.logger = Logger.new(STDERR)
- require "rubygems"
- require "active_record"
- ActiveRecord::Schema.define do
- create_table :employees, :force => true do |t|
- t.string :name
- t.integer :manager_id
- t.integer :mentor_id
- end
- end
- class Employee < ActiveRecord::Base
- belongs_to :manager,
- :class_name => "Employee",
- :foreign_key => "manager_id"
- belongs_to :mentor,
- :class_name => "Employee",
- :foreign_key => "mentor_id"
-
- has_many :mentored_employees,
- :class_name => "Employee",
- :foreign_key => "mentor_id"
- has_many :managed_employees,
- :class_name => "Employee",
- :foreign_key => "manager_id"
- end
- Employee.delete_all
- adam = Employee.create(:name => "Adam")
- beth = Employee.create(:name => "Beth")
- clem = Employee.new(:name => "Clem")
- clem.manager = adam
- clem.mentor = beth
- clem.save!
- dawn = Employee.new(:name => "Dawn")
- dawn.manager = adam
- dawn.mentor = clem
- dawn.save!
- p adam.managed_employees.map {|e| e.name} # => [ "Clem", "Dawn" ]
- p adam.mentored_employees # => []
- p dawn.mentor.name # => "Clem"
|
