test_report.rb

#encoding utf-8
require 'rubygems'

# this searches up the directory path to find Gemfile:

#source 'https://rubygems.org'
#gem 'mongo_mapper', :git => "git://github.com/mongomapper/mongomapper.git", :tag => "v0.13.0.beta2"
#gem 'bson_ext'
#gem 'minitest' 

# and hacks the ruby loadpath to make gems available.
require 'bundler/setup'

gem 'minitest'
require 'minitest/autorun'

require 'mongo_mapper'

MongoMapper.connection = Mongo::Connection.new('localhost', 27017)
MongoMapper.database = "e360-test"

# Monkey Patch to solve issue https://github.com/jnunemaker/mongomapper/issues/507

# this patch is required to trigger the bug in 550.

module MongoMapper
  module Plugins
    module Querying
      private
        def save_to_collection(options={})
          @_new = false
          collection.save(to_mongo, :w => options[:safe] ? 1 : 0)
        end
    end
  end
end

require 'yaml'; Fixtures = YAML::load(<<EOS)
---
feedback:
  -
    feedback: [1,1,2,3,5,8,11]
  -
    feedback: [3, 4, 2, 3, 0, 3, 0] 
  -
    feedback: [1, 3, 3, 1, 1, 3, 3] 
  -
    feedback: [2, 4, 4, 2, 5, 4, 5] 
  -
    feedback: [1, 5, 3, 4, 4, 3, 5] 
EOS

class Feedback 
  include MongoMapper::EmbeddedDocument
  key :feedback, Array 
end

class Opinion
  include MongoMapper::Document
  
  many :feedback
  belongs_to :report
      
  def complete?() true; end
end

class Report 
  include MongoMapper::Document
  
  many :opinions
    
  # you have to call complete? to trigger the bug
  def complete?() 
    self.opinions.all?(&:complete?).tap{|x| STDERR.puts "WTF: #{x.inspect}"; }
  end
end

describe Report do
  it 'triggers a bug' do
    Opinion.destroy_all; Report.destroy_all
    @feedback = Fixtures['feedback'].collect{|f| Feedback.new(f);}
    @opinions = (1..3).collect { |i| Opinion.create(feedback:@feedback[i-1..i+1])}
    @report = Report.new(opinions: @opinions)
    assert @report.save # works fine
    # trigger bug
    @report.save if @report.complete?
  end
  
end