django -->> mixin to get the lastest photo uploaded

gistfile1.py

from django.views.generic import TemplateView
from sorl.thumbnail import get_thumbnail
from collections import OrderedDict
from django.db import models


# Model
class Something(models.Model):
       photo = models.ImageField(upload_to='somewhere', blank=True)
       date_time = models.DateTimeField(auto_now=True)


#view
class Home(LastPhotoUploadedMixIn, TemplateView):
	template_name = 'home.html'
	model = PhotosProfiles
	photo_size = '50x50'
	

#mixin
class LastPhotoUploadedMixIn(object):
	model = None
	photo_size = None # example '50x50'  

	def query(self):
		queryset = self.model.objects.get(date_time=self.last_uploaded())
		return queryset

	def get_model_objs(self):
		queryset = self.model.objects.filter(user=self.request.user or request.user)
		return queryset

	def last_uploaded(self):
		date_time_obj = self.get_model_objs()
		
		if not date_time_obj:
			return None
		
		DATETIME = {}

		for n, obj in enumerate(date_time_obj):

			DATETIME.update({
				n : str(obj.date_time),
			})

		ordtime = OrderedDict(DATETIME)

		return ordtime.values()[-1]
	
	def get_context_data(self, **kwargs):
	    
	    context = super(LastPhotoUploadedMixIn, self).get_context_data(**kwargs)
	    
	    if self.request.user.is_authenticated():
	    	try:
	    		if self.query():
	    			context = {
		    			'photo': get_thumbnail(
		    						self.query().photo, 
		    						self.photo_size, 
		    						format='PNG'
		    					  ).url,
		    		}
		    		
	    	except self.model.DoesNotExist:
	    		pass

		return context