xxx.changed? 总是返回 true

[moioo]

2.1.4 xxx.changed? 总是返回true
如果有serialize字段在2.1.2调用xxx.changed?会

smart.changed?
ActiveRecord::SerializationTypeMismatch: Attribute was supposed to be a Hash, but was a String. -- "{:a=>\"t\", :b=>\"x\"}"
from /Users/moioo/.rvm/gems/ruby-2.2.2/gems/activerecord-4.2.1/lib/active_record/coders/yaml_column.rb:17:in `dump'