What are some examples of model validators in Django?

What are some examples of model validators in Django?

Django provides several built-in validators. For example, you can use MaxValueValidator to ensure a field's value doesn't exceed a certain limit.

Can you give me a code example of using MaxValueValidator?

Sure! Here's a simple example:

from django.core.validators import MaxValueValidator
from django.db import models

class Product(models.Model):
    price = models.DecimalField(max_digits=10, decimal_places=2, validators=[MaxValueValidator(100)])

This ensures that the price cannot exceed 100.

What about custom validators? How can I create one?

You can create a custom validator by defining a function. For example:

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

Then, you can use it in your model field.

Thanks! Are there any other built-in validators I should know about?

Yes, there are several! Some common ones include MinValueValidator, EmailValidator, and URLValidator. Each serves a specific purpose.