Shinpeim · August 29, 2015 14:07
diff --git a/nyan.rb b/nyan.rb
 user = User.first
 user.email = 'nyan'
 user.changes # => {"email"=>["[email protected]", "[email protected]"]}

 duped = user.dup
 duped.name_chanded? # => true
 duped.changes # => {"email"=>["", "[email protected]"]], "name"=>[""=>"shinpei"]}
	user = User.first
	user.email = 'nyan'
	user.changes # => {"email"=>["[email protected]", "[email protected]"]}

	duped = user.dup
	duped.name_chanded? # => true
	duped.changes # => {"email"=>["", "[email protected]"]], "name"=>[""=>"shinpei"]}