django object manager

models.py

from django.db import models
from django.db.models import Q


class MyModelManager(models.Manager):
  """Define methods on MyModel.objects."""
  def get_queryset(self):
    return MyModelQuerySet(self.model)

  def __getattr__(self, name, *args):
    if name.startswith("_"):
      raise AttributeError
    return getattr(self.get_queryset(), name, *args)


class MyModel(models.Model):
  objects = MyModelManager()
  

class MyModelQuerySet(models.query.QuerySet):
  """Extend MyModel queryset."""
  
  def dummy(self):
    pass