improved_dirty_tracking_in_dm_1.2.0.rb

improved_dirty_tracking_in_dm_1.2.0.rb

require 'rubygems'
require 'data_mapper'

DataMapper.setup :default, 'sqlite::memory:'

class Book
  include DataMapper::Resource

  property :id,   Serial
  property :meta, Json
end

DataMapper.finalize.auto_migrate!

Book.create(:meta => { :title => 'Some Title' })

book = Book.first
book.meta['title'] # 'Some Title'

book.meta['title'] = 'Other Title'

puts book.dirty?
puts book.dirty_attributes

# --------------------------------------------------------------------------------------
# Output:
#
# true
# {#<DataMapper::Property::Json @model=Book @name=:meta>=>"{\"title\":\"Other Title\"}"}