How can I implement custom validation in Django serializers?

How can I implement custom validation in Django serializers?

You can implement custom validation in Django serializers by overriding the validate method or using field-level validation.

Can you show me an example of overriding the validate method?

Sure! Here's a simple example:

from rest_framework import serializers

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

    def validate_name(self, value):
        if 'badword' in value:
            raise serializers.ValidationError('Inappropriate word found!')
        return value

What if I want to validate multiple fields together?

You can override the validate method for that. Here's an example:

class MySerializer(serializers.Serializer):
    password = serializers.CharField()
    confirm_password = serializers.CharField()

    def validate(self, data):
        if data['password'] != data['confirm_password']:
            raise serializers.ValidationError('Passwords do not match!')
        return data