Company - Job example

company.rb

class Company
   include MongoMapper::Document
   
   key :name, String
   
   many :jobs
   
   def to_s
     name
   end
   def to_s_full
     text = "#{name}"
     unless jobs.empty?
       text += "\n\tJOB LISTING\n"
       jobs.each {|j| text += "\t#{j.to_s}\n"}
     end
     text
   end
end

company_demo.rb

$LOAD_PATH << File.expand_path(File.dirname(__FILE__) + "/../app/model")
require 'rubygems'
require 'mongo_mapper'
require 'company'
require 'job'

MongoMapper.connection = Mongo::Connection.new('127.0.0.1', 27017)
MongoMapper.database = 'demo'

# Clean any data from prior runs
col = Company.all()
col.each {|c| c.destroy } unless col.nil?
col = Job.all()
col.each {|c| c.destroy } unless col.nil?

# Create some samples to show nesting
c1 = Company.create(:name => "Greatest Company Ever" )
j1 = Job.create( :description => "Agile Quarterback", :company => c1)
j2 = Job.create(:description => "MongoMapper Guru", :company => c1)
c1.reload

puts c1.inspect
puts j1
puts c1.to_s_full
puts "j1.company.jobs.size: #{j1.company.jobs.size}"

job.rb

class Job
   include MongoMapper::Document

   key :description, String
   
   # one :company # This does NOT work
   key :company_id, ObjectId
   belongs_to :company
   
   def to_s
     "#{company}: #{description}"
   end
end

Structure

Files are in structure:
app/model
company.rb
job.rb
spec
company_demo.rb

Results

#<Company name: "Greatest Company Ever", title: nil, _id: BSON::ObjectId('4d29f2fb8951a2828c000001'), job_id: nil>

Greatest Company Ever: Agile Quarterback
Greatest Company Ever
    JOB LISTING
    Greatest Company Ever: Agile Quarterback
    Greatest Company Ever: MongoMapper Guru
j1.company.jobs.size: 2