MongoMapper Associations

ma.rb

require 'rubygems'
require 'mongo_mapper'

MongoMapper.database = "test_associations"

class Job
  include MongoMapper::Document
  
  belongs_to :invoice
  
  before_save :hello_world
  
  def hello_world
    puts "saving a job"
  end

end

class Invoice
  include MongoMapper::Document
  
  many :jobs
  
  before_save :hello_world
  
  def hello_world
    puts "saving an invoice"
  end
  
end

invoice = Invoice.new
10.times{ invoice.jobs << Job.create }
invoice.save

puts "==== Now we've created an Invoice with 10 Jobs ===="

puts "==== If we touch that Invoice, no problemo ===="

invoice = Invoice.first
invoice.save

puts "==== But if we touch all its Jobs, we have to save them all (even if we didn't modify any of them) ===="

invoice.jobs.collect
invoice.save

puts "==== At scale, this is pretty limiting ==== "