How can I create custom validators in Django?

How can I create custom validators in Django?

To create custom validators in Django, you can define a function that raises a ValidationError if the input is invalid.

Can you show me an example of a custom validator?

Sure! Here's a simple example:

from django.core.exceptions import ValidationError

def validate_even(value):
    if value % 2 != 0:
        raise ValidationError(f'{value} is not an even number.')

How do I use this validator in a model?

You can use it in your model field like this:

from django.db import models

class MyModel(models.Model):
    number = models.IntegerField(validators=[validate_even])

What if I want to add multiple validators?

You can simply add them to the validators list like this:

class MyModel(models.Model):
    number = models.IntegerField(validators=[validate_even, another_validator])