These days, I create a custom manager repr for django:

https://github.com/954-Ivory/django_bulk_hook_manager

But I get the error when I use it with DRF:

rest_framework/serializers.py", line 686, in to_representation
    return [
TypeError: 'RelatedManager' object is not iterable

So, I check it, and found the reason.

Error line:

iterable = data.all() if isinstance(data, models.Manager) else data

This line should change to:

iterable = data.all() if isinstance(data, (
            models.manager.Manager, models.manager.BaseManager
        )) else data

We need to check whether data is a BaseManager instance.

I will PR later.