如何在 ruby​​ 中做 attr_accessor_with_default? [英] How to do attr_accessor_with_default in ruby?

问题描述

我在 Rails 模型中使用 attr_accessor_with_default 的一些代码现在给我一个弃用警告，告诉我改用 Ruby！"

所以，我认为 ruby 1.9.2 中可能有一个新的部分使 attr_accessor 处理默认值，我用谷歌搜索了它，但我没有看到.我确实看到了一堆方法来覆盖 attr_accessor 来处理默认值.

当他们告诉我使用 Ruby"时，这就是他们的意思吗?或者我现在应该写完整的 getter/setter 吗?还是有什么新方法我找不到?

解决方案

attr_accessor :pancakesdef after_initialize除非 new_record 返回?self.pancakes = 11结尾

<块引用>

这确保该值仅针对新记录初始化为某个默认值.

Some code that I had that used attr_accessor_with_default in a rails model is now giving me a deprecation warning, telling me to "Use Ruby instead!"

So, thinking that maybe there was a new bit in ruby 1.9.2 that made attr_accessor handle defaults, I googled it, but I don't see that. I did see a bunch of methods to override attr_accessor to handle defaults though.

Is that what they mean when they tell me to "Use Ruby?" Or am I supposed to write full getters/setters now? Or is there some new way I can't find?

解决方案

attr_accessor :pancakes

def after_initialize
     return unless new_record?
     self.pancakes = 11
end

This ensures that the value is initialized to some default for new record only.

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