In pre 2.3 it was possible to have a shared serializer for different models. In my case I have more or less the same invoice class for multiple entities, and had a serializer like this:

class InvoiceSerializer(serializers.ModelSerializer):

    total = serializers.IntegerField(
        read_only=True
    )

    class Meta:
        model = AbstractInvoice
        fields = ('number', 'end_date', 'status', 'total')

This raises an error in line 187 of field mapping.py, because AbstractInvoice does not have a _default_manager.

I could fix the error by setting the field no read-only (I have not added the POST/PUT anyway for that model).

However, it would be great if we could set that field dynamically.