覆盖 ActiveRecord 属性方法 [英] Override ActiveRecord attribute methods
问题描述
我正在谈论的一个例子:
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
这似乎有效,但我刚刚阅读了 中关于覆盖属性方法的部分ActiveRecord::Base docs,它建议使用 read_attribute
和 write_attribute
方法.我认为我在上面的例子中所做的一定有问题;否则,为什么他们会祝福这些方法是覆盖属性方法的正确方法"?他们还强迫使用更丑陋的习语,所以一定有充分的理由......
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...
我真正的问题是:这个例子有什么问题吗?
My real question: Is there something wrong with this example?
推荐答案
回应 Gareth 的评论...您的代码将无法正常工作.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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