What are the best practices for using model validators in Django?

What are the best practices for using model validators in Django?

When using model validators in Django, it's important to keep your validation logic clean and reusable. You should also consider using built-in validators whenever possible to save time and ensure consistency.

Can you give me an example of a custom validator?

Sure! Here's a simple example of a custom validator that checks if a value is positive:

from django.core.exceptions import ValidationError

def validate_positive(value):
    if value <= 0:
        raise ValidationError('Value must be positive.')

How do I apply this validator to a model field?

You can apply the custom validator to a model field like this:

from django.db import models

class MyModel(models.Model):
    positive_number = models.IntegerField(validators=[validate_positive])

Are there any performance considerations I should be aware of?

Yes, excessive validation can slow down your application, especially if you're validating large datasets. It's best to keep validations lightweight and only apply them where necessary.