如何验证文本在Rails中不是空白 [英] How to validate text isn't blank in Rails

问题描述

如果我愿意

  validates :body, :presence => true, :length => {:maximum => 30000, :message => ' is a bit long...'}
  validates :body, :length => {:minimum => 10, :message => ' is a bit short...'}

我仍然有可能使用包含以下内容的文本仅个空格和 / r 或 / n -不可见字符，虽然按定义文本不是空白，但通过查看它却是空白

I still have a possibility of having a text which includes only spaces and /r or /n - non visible chars, which while the text isn't blank by definition, it is blank by looking at it

我如何验证文本的最小和最大长度在上面列出并且也是可见的（不是10个空格）

How can I validate that the text had a min and max length listed above and is also visible (not 10 spaces)

推荐答案

Rails添加了方便的方法空白？，它按照中所述检查错误，零和空字符串在这里。

Rails还添加了方便的验证器 allow_blank：false 。

Rails adds the handy method blank? which checks for false, nil and empty strings as described here.
Rails also adds the handy validator allow_blank: false.

因此，在您的情况下应该是：

So in your case it should be:

validate：body，状态： true，allow_blank：false

编辑（以上原始答案）：

Edit (original answer above):

如下面的答案所述，不需要 allow_blank：false ，因为这是 presence的默认行为：正确。

As stated in the answer below, allow_blank: false is not needed as that's the default behaviour of presence: true.

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