零的 ActiveRecord 验证 [英] ActiveRecord validation for nil
问题描述
我正在尝试编写一个允许任何字符串但不允许 nil 的活动记录验证.
I am trying to write an active record validation that allows any string but does not allow nil.
validates_presences_of 的问题在于它返回 false 为"或",我认为它是有效的.
The problem with validates_presences_of is that it returns false for "" or " " which I want to consider valid.
我也尝试过 validates_length_of :foo, :minimum => 0 没有用
I have also tried to do validates_length_of :foo, :minimum => 0 which did not work
我也试过 validates_length_of :foo, :minimum => 0, :unless => :nil?这也不起作用.这两个都允许设置 nil 值并且验证仍然返回 true.
I have also tried t o do validates_length_of :foo, :minimum => 0, :unless => :nil? which also did not work. Both of these allowed for nil values to be set and the validation still returns true.
我在这里遗漏了什么吗?我觉得简单地验证元素不为零应该不难.
Am i missing something here? I feel like it shouldnt be this hard to simply validate that the element is not nil.
推荐答案
validate :blank_but_not_nil
def blank_but_not_nil
if self.foo.nil?
errors.add :foo, 'cannot be nil'
end
end
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