Multiple validators for Django 1.11 Model CharField

Question

Does anyone know if it is possible to apply multiple validators to a Django 1.11 Model CharField? I am trying to enforce formatting of the field as either: "Use format XX XXXX XXXX" or "Use format XXXX XXX XXX"

prefphone = models.CharField(max_length=255,null=True,blank=True,validators=[RegexValidator(r'^[0-9]{2} [0-9]{4} [0-9]{4}$', "Use format XX XXXX XXXX"),RegexValidator(r'^[0-9]{4} [0-9]{3} [0-9]{3}$', "Use format XXXX XXX XXX")])

The first validation is failing and the second validation is not tested.

If there are alternative methods to achieve my outcome I would be grateful to hear them. Thanks!

Answer 1

Here's my approaching for multiple validator: Define a custom validator function:

from django.core.exceptions import ValidationError

validator_fn = [
    RegexValidator(r'^[0-9]{2} [0-9]{4} [0-9]{4}$', "Use format XX XXXX XXXX"),
    RegexValidator(r'^[0-9]{4} [0-9]{3} [0-9]{3}$', "Use format XXXX XXX XXX")
]

def regex_validators(value):
    err = None
    for validator in validator_fn:
        try:
            validator(value)
            # Valid value, return it
            return value
        except ValidationError as exc:
            err = exc
    # Value match nothing, raise error
    raise err

Now in field, just use regex_validators as a single validator:

prefphone = models.CharField(max_length=255,null=True,blank=True,validators=[regex_validators,])