[PYTHON] How to implement "named_scope" of RubyOnRails with Django

from django.db.models.query import QuerySet
from django.db import models 

class PlayerScopeMixin(object):
	"""
    Player Class Scope Chain Mixin
	"""

    @property
    def newcomer_time(self):
		"""
		:return:Start time of new player period(One week ago from now)
		"""
       date_obj = datetime.datetime.now(utc) - datetime.timedelta(7)
       return date_obj

	def by_active(self):
		"""
Get active record
		:return:QuerySet filter
		"""
		return self.filter(active_flg = True)

    def by_newcomer(self, newcomer_flg=True):
        """
Record extraction by new player judgment
		 :param limit_flg: True(New player) / False(非New player) 
        :return:QuerySet filter
        """
        return self.filter(created_at__gt=self.active_limit_time)

	def by_active_newcomer(self):
        """
New active user
        """
        return self.by_active().by_newcomer()




class PlayerQuerySet(QuerySet, PlayerScopesMixin):
	"""
	PlayerQuerySet
	"""
	pass


class PlayerManager(models.Manager, PlayerScopeMixin):
	"""
	PlayerManager
	"""
	def get_query_set(self):
        return PlayerQuerySet(self.model, using=self._db)


class Player(models.Model):
	class Meta:
		app_label = 'player'
	
	active_flg = models.BooleanField(default=False)
	created_at = models.DateTimeField(auto_now_add=True)
	updated_at = models.DateTimeField(auto_now=True)

> Player.by_active_newcommer() == Player.by_active().by_newcomer()

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