覆盖的ActiveRecord属性的方法 [英] Override ActiveRecord attribute methods
问题描述
什么我谈论的一个例子:
An example of what I'm talking about:
class Person < ActiveRecord::Base
def name=(name)
super(name.capitalize)
end
def name
super().downcase # not sure why you'd do this; this is just an example
end
end
这似乎工作,但我只是读的 ActiveRecord的覆盖属性的方法:: Base的文档的部分,并建议使用 read_attribute
和 write_attribute
的方法。我想一定有什么毛病我在做什么在上面的例子;否则,他们为什么会保佑这些方法是正确的方式来覆盖属性的方法?他们也迫使很多丑陋的成语,所以必须有一个很好的理由......
This seems to work, but I was just read the section on overriding attribute methods in the ActiveRecord::Base docs, and it suggests using the read_attribute
and write_attribute
methods. I thought there must be something wrong with what I'm doing in the example above; otherwise, why would they bless these methods as the "right way" to override attribute methods? They're also forcing a much uglier idiom, so there must be a good reason...
我真正的问题:有什么不对的例子
My real question: Is there something wrong with this example?
推荐答案
加雷斯赞同的意见......因为你写的code将无法正常工作。应该这样改写:
Echoing Gareth's comments... your code will not work as written. It should be rewritten this way:
def name=(name)
write_attribute(:name, name.capitalize)
end
def name
read_attribute(:name).downcase # No test for nil?
end
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