How to extend django abstract base model by inheritance?

Question

I'm trying to extend my django abstract base model via inheritance, but django model's behavior that automatically sets abstract = True to abstract = False on any subclasses of abstract models is bothering me.

So the situation is

from django.db.models import Model
from django.db.models.base import ModelBase

Class TimeStampedModel(Model):
    created_time = DateTimeField()
    modified_time = DateTimeField()

    class Meta:
        abstract = True
        ordering = ('created_time',)
        get_latest_by = 'created_time'


class RecordModelMetaClass(ModelBase):
    # NOT IMPLEMENTED YET
    pass


class RecordModel(TimeStampedModel):
    __metaclass__ = RecordModelMetaClass

    recording_model = NotImplemented
    recording_fields = NotImplemented

Where the abstract TimeStampedModel is base model for abstract RecordModel.

The problem is that Django's metaclass ModelBase automatically converts RecordModel's abstract = True to abstract = False when RecordModel is defined in import time.

Is there any way to turn off this django's behavior?

what is ModelMase (to be corrected in ModelBase, BTW)?

Pynchia
– Pynchia

2015-05-12 08:12:23 +00:00
Commented May 12, 2015 at 8:12 — Pynchia
– Pynchia, Commented May 12, 2015 at 8:12
@Pynchia It's a metaclass for django.db.models.Model

June
– June

2015-05-12 08:15:16 +00:00
Commented May 12, 2015 at 8:15 — June
– June, Commented May 12, 2015 at 8:15

Daniel Roseman · Accepted Answer · 2015-05-12 08:16:27Z

4

Yes, and this is documented:

If the child wants to extend the parent’s Meta class, it can subclass it.

In your case:

class RecordModel(TimeStampedModel):
    class Meta(TimestampedModel.Meta):
        abstract = True

answered May 12, 2015 at 8:16

Daniel Roseman

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