验证以保证唯一性，但忽略空值？ [英] Validation to ensure uniqueness of but ignoring empty values?

问题描述

我有以下的模型现场验证：

I have the following model field validation:

validates_uniqueness_of :acronym, :scope => [:group_id], :case_sensitive => false

现在的问题是，这一领域是可选的，和一个空/空值被返回作为已经采取的首字母缩写。我只是想验证的缩写，是独特的，如果提供了一个值..有没有一种方法来更新这个验证，只需要的地方，如果有实际价值..不是零/空的？

The problem is that this field is optional, and a empty/nil value is returning as being an acronym already taken. I only want to validate that an acronym is unique if a value was provided.. Is there a way to update this validation to only take place if there is an actual value.. not nil/empty?

感谢

推荐答案

是的，有一些可以传递给验证为可选字段两个可能的选择：：allow_blank 或：allow_nil ，这将跳过验证上空白和零字段，分别。如果你改变你的验证，下面，你应该得到你想要的行为：

Yes, there are two possible options that you can pass to validations for optional fields: :allow_blank or :allow_nil, which will skip the validations on blank and nil fields, respectively. If you change your validation to the following, you should get the behaviour you want:

validates_uniqueness_of :acronym, :allow_blank => true, :scope => [:group_id], :case_sensitive => false

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