What are some examples of serializer validation?

Can you give me some examples of serializer validation?

Sure! Serializer validation ensures that the data being serialized meets certain criteria. For example, in a user registration serializer, you might validate that the email is in the correct format and that the password meets minimum length requirements.

What happens if the validation fails?

If validation fails, the serializer will typically raise an error, and the data won't be saved or processed. Instead, it will return a response indicating what went wrong.

Can you show me a code example?

Absolutely! Here's a simple example in Python using Django REST Framework:

from rest_framework import serializers

class UserSerializer(serializers.Serializer):
    email = serializers.EmailField(required=True)
    password = serializers.CharField(min_length=8)

    def validate_email(self, value):
        if User.objects.filter(email=value).exists():
            raise serializers.ValidationError('Email already in use.')
        return value