Allow validators to short-circuit in form field validation

[Alexey Rogachev]

I opened ticket https://code.djangoproject.com/ticket/27263.

Do you think the solution I suggested in comment is OK?

[charettes]

Hi Alexey,

I'm not sure I understand why the approach Aymeric suggested is not viable for
your use case.

It can be implemented in a few lines and doesn't require any modification to
Django core.


class ShortCircuitValidator(object):
    def __init__(self, *validators):
        self.validators = validators

    def __call__(self, value):
        for validator in self.validators:
            validator(value)


class FileForm(forms.Form):
    file = forms.FileField(
        validators=[ShortCircuitValidator(
            FileSizeValidator(max_size='500 kb'),
            FileTypeValidator(extensions=['xlsx']),
        )],
    )

Simon

[Aymeric Augustin]

Note that I made this comment in reaction to Alexey’s email here :-)

-- 

Aymeric.

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