rails 4.2 supports dirty tracking for serialized values http://edgeguides.rubyonrails.org/4_2_release_notes.html#active-record-notable-changes
rails 4.2 supports dirty tracking for serialized values
http://edgeguides.rubyonrails.org/4_2_release_notes.html#active-record-notable-changes

sufleR/embedson