Custom Querysets using Multiple Models in Django -

i trying findout way in can use multiple models in queryset. instance, in case have 2 tables - photo , user.

class photo(models.model): username = models.foreignkey(user) image = models.imagefield(upload_to='photos') alt_text = models.charfield(max_length=255)  class dr_user(models.model):     userid = models.foreignkey(user)     follows = models.manytomanyfield('self', related_name='followed_by', symmetrical=false, blank=true) objects = dr_user_manager()  class dr_user_query_set(queryset):     def profile_pic(self):         # uid = self.userid         photo = photo.objects.get(username=uid)         if photo.exists():             return photo.image.url         else:             return 'http://d12df125d01b8a258a3a-8112fdc02f7d385b44f56eb9e899d81c.r88.cf2.rackcdn.com/default.png'      def userinfo(self):         uid = self.userid         obj = user.objects.get(id=uid)         userinfo = obj.first_name + ' ' + obj.last_name         return userinfo.title()  class dr_user_manager(models.manager):     def get_query_set(self):         return dr_user_query_set(self.model)     def __getattr__(self, name):         return getattr(self.get_query_set(), name) 

my aim create custom queryset dr_user can userinfo user table(auth_user) , image url photo table...so when use -

user = dr_user.objects.all() 

i can access them @ once using {{ user.profile_pic }} , {{ user.userinfo }} in template.

too work.

class dr_user(models.model):    ...   @property   def profile_pic(self):     try:       return self.userid.image.url     except models.doesnotexist:       return settings.default_profile_pic_url    @property   def userinfo(self):     return unicode(self.userid)