old_contents: from django.contrib.gis.db import models as geomodels
  from django.contrib.gis.geos.point import Point
  
  from geopy import geocoders
  
  class GeoLocatedModel(geomodels.Model):
      geom = geomodels.PointField(null=True, blank=True)
      
      objects = geomodels.GeoManager()
      
      def get_location_as_string(self):
          """
          Should return a string for the address as Google Maps format
          """
          raise NotImplementedError
      
      class Meta:
          abstract = True
  
  def update_geolocation(sender, instance, **kwargs):
      """
      This signal receiver update the instance but does not save it
      Should be used with pre_save signal
      """
      g = geocoders.GoogleV3()
      try:
          place, (lat, lng) = g.geocode(instance.get_location_as_string())
          instance.geom = Point(lng, lat)
      except:
          instance.geom = None
new_contents: from django.contrib.gis.db import models as geomodels
  from django.contrib.gis.geos.point import Point
  
  from geopy import geocoders
  
  class GeoLocatedModel(geomodels.Model):
      geom = geomodels.PointField(null=True, blank=True)
      
      objects = geomodels.GeoManager()
      
      def get_location_as_string(self):
          """
          Should return a string for the address as Google Maps format
          """
          raise NotImplementedError
      
      def is_geolocated(self):
          """
          Usefull for example in the admin in order to easily identify non geolocated object
          """
          return self.geom is not None
      is_geolocated.boolean = True
      
      class Meta:
          abstract = True
  
  def update_geolocation(sender, instance, **kwargs):
      """
      This signal receiver update the instance but does not save it
      Should be used with pre_save signal
      """
      g = geocoders.GoogleV3()
      try:
          place, (lat, lng) = g.geocode(instance.get_location_as_string())
          instance.geom = Point(lng, lat)
      except:
          instance.geom = None
subject: Add is_geolocated property for admin purpuse