Hello,

We have a use case where we accept either a list of objects or null. The problem is that BaseSerializer.many_init is not passing the allow_null argument to the ListSerializer constructor. because of that I have validation errors even if the field was specified with allow_null=True.

He's an example:

class PaymentInfoSerializer(serializers.Serializer):
    url = serializer.CharField()
    amount = serializers.DecimalField()

    def validate(self, attrs):
        """
        This is never being called
        """


class Request(serializers.Serializer):
    payment_info = PaymentInfoSerializer(
        many=True, 
        required=False,
        allow_null=True)

Basically LIST_SERIALIZER_KWARGS (defined here) does not include allow_null and therefore the arguments is not passed to the ListSerializer constructor (details here).

Is there a reason why allow_null should not be sent to the list serializer?

Thanks!