List dirty model changes in a human readable format

gistfile1.rb

# Probably not the ideal way to handle this, but it should output the changes made to a model after it's been updated.
# If you want to grab the changes before the model is saved, change '.previous_changes' to '.changes'

# Hash contains a hash of changes in this following format:
# {attribute_name_1 => [old_value, new_value], attribute_name_2 => [old_value, new_value]}
change_hash = your_changed_object.previous_changes

# If we don't want to include the "updated_at" (or some other attributes), delete their keys from the hash
change_hash.delete("updated_at")

# Output all of the changes to a string in sentence form ("Changed name from 'Bob' to 'Joe'")
changes = change_hash.map{ |k,v| "changed '#{k}' from '#{v[0]}' to '#{v[1]}'" }.to_sentence