How can I validate fields in Django serializers?

How can I validate fields in Django serializers?

You can validate fields in Django serializers by overriding the validate_<field_name> method or using the validators argument.

Can you give me an example of using validate_<field_name>?

Sure! If you have a field called age, you can create a method like this:

class UserSerializer(serializers.Serializer):
    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 in your serializer. Here's an example:

class UserSerializer(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