How to create calculated fields in Django's Djapy? And access the source / original object?

[Bishwas-py]

Assigning SourceAble to your schema is enough, and then you can use self._source_obj to get your objects.

class AssignCommentSchema(Schema, SourceAble):
    @computed_field
    def comments(self, *args, **kwargs) -> SimpleCommentSchema:
        comments = PolymorphicComments.objects.filter(
            parent_id=self._source_obj.id,
            parent_type=ContentType.objects.get_for_model(self._source_obj)).alive()
        print(comments.count())
        return {
            'comment_count': comments.count(),
            'last_comment': comments.last() if comments.exists() else None,
        }

[Bishwas-py]

from djapy.schema import SourceAble