How do I validate serializer data in Django REST Framework?

How do I validate serializer data in Django REST Framework?

You can validate serializer data in Django REST Framework by overriding the validate method in your serializer class.

Can you give me an example of how to do that?

Sure! Here's a simple example:

from rest_framework import serializers

class MySerializer(serializers.Serializer):
    name = serializers.CharField(max_length=100)
    age = serializers.IntegerField()

    def validate_age(self, value):
        if value < 0:
            raise serializers.ValidationError('Age must be a positive integer.')
        return value

What if I want to validate multiple fields together?

You can override the validate method to validate multiple fields together. Here's an example:

def validate(self, attrs):
    if attrs['age'] < 18 and attrs['consent'] is False:
        raise serializers.ValidationError('You must be 18 or have consent.')
    return attrs