old_contents: from django.db import models
  
  from lemon.publications.querysets import PublicationQuerySet
  
  
  class PublicationManager(models.Manager):
      
      def expired(self):
          return self.get_query_set().expired()
  
      def future(self):
          return self.get_query_set().future()
  
      def enabled(self):
          return self.get_query_set().enabled()
  
      def disabled(self):
          return self.get_query_set().disabled()
      
      def unpublished(self):
          return self.get_query_set().unpublished()
      
      def published(self):
          return self.get_query_set().published()
      
      def get_query_set(self):
          return PublicationQuerySet(self.model)
  
new_contents: from django.db import models
  
  from lemon.publications.querysets import PublicationQuerySet
  
  
  class PublicationManager(models.Manager):
      
      def expired(self):
          return self.get_query_set().expired()
  
      def future(self):
          return self.get_query_set().future()
  
      def enabled(self):
          return self.get_query_set().enabled()
  
      def disabled(self):
          return self.get_query_set().disabled()
      
      def unpublished(self):
          return self.get_query_set().unpublished()
      
      def published(self):
          return self.get_query_set().published()
      
      def get_query_set(self):
          return PublicationQuerySet(self.model, using=self._db)
  
subject: Fix handling of the _db attribute on the PublicationManager in get_query_set