Re: Require min length only if field is present

Christopher Arndt schrieb:
> Or more generally, is there a validator, that applies another validator only if
> a field is not empty?

Sorry, to reply to myself, but I just found the solution:

    password1 = validators.Any(
        validators.UnicodeString(min=passwd_minlen, minmax=40, strip=True),
        validators.Empty
    )


I thought, I had tried this, but I must have accidentally used 'validators.All'
instead.

Please note that the order of the validators in validators.Any is important,
because if you put validators.Empty first and there is a value but the second
validator raises Invalid, you will get the error message from the Empty
validator, saying "You cannot enter a value here", which is probably not what
you want.

Chris

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