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问题描述
在 Rails 3 中更新之前需要检查属性块是否已更改.
Need to check if a block of attributes has changed before update in Rails 3.
street1、street2、城市、州、邮政编码
street1, street2, city, state, zipcode
我知道我可以使用类似的东西
I know I could use something like
if @user.street1 != params[:user][:street1]
then do something....
end
但是那段代码真的很长.有没有更干净的方法?
But that piece of code will be REALLY long. Is there a cleaner way?
推荐答案
查看 ActiveModel::Dirty(默认适用于所有型号).该文档非常好，但它可以让您执行以下操作:
Check out ActiveModel::Dirty (available on all models by default). The documentation is really good, but it lets you do things such as:
@user.street1_changed? # => true/false
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