What are some examples of serializer field validation?

Can you give me some examples of serializer field validation?

Sure! Serializer field validation ensures that the data being serialized meets certain criteria. For example, you can validate that a field is required, or that it matches a specific format.

What are some common validation rules I can use?

Common validation rules include checking for required fields, validating email formats, ensuring minimum and maximum lengths for strings, and using regex for custom patterns.

How do I implement these validations in Django Rest Framework?

In Django Rest Framework, you can implement validations by overriding the validate_<field_name> method in your serializer or by using built-in validators like EmailValidator.

Can you show me a code example?

Certainly! Here's a simple example:

from rest_framework import serializers

class UserSerializer(serializers.Serializer):
    email = serializers.EmailField(required=True)
    username = serializers.CharField(max_length=150)

    def validate_username(self, value):
        if ' ' in value:
            raise serializers.ValidationError('Username cannot contain spaces.')
        return value