Ohk, I got it now.. Thanks for clarifying this. My further doubts in continuation of this are.
1. For confirmation, ModelName.objects.all() calls get_queryset() method, while ModelName.objects.get calls get() method internally. 2. In above code to override default serialize method of BasicUserUpdate for get_queryset() method, We have to do 2 things. 1. Inherit default models.Manager and override get_queryset() method. 2. Inherit models.QuerySet and override default serialize method. Honestly it seems overkill for this problem. Can u please suggest alternative straight forward way to do it in model only. On Friday, May 29, 2020 at 3:34:39 PM UTC+5:30, Sencer Hamarat wrote: > > I believe, the method "get_query*set*" name is explains what you want to > know. > > If you filter or fetch every thing with django query, it returns queryset. > The .get() query on the other hand, returns a single object. > > Saygılarımla, > Sencer HAMARAT > > > > On Fri, May 29, 2020 at 4:43 AM django-newbie <[email protected] > <javascript:>> wrote: > >> Hi, >> I am new to django and going through a tutorial and now confused with one >> particular implementation. >> >> models.py >> >> import json >> from django.core.serializers import serialize >> >> from django.db import models >> from django.conf import settings >> >> # Create your models here. >> >> >> def upload_update_image(instance, filename): >> return "updates/{owner}/{filename}".format(owner=instance.owner, >> filename=filename) >> >> class UpdateQuerySet(models.QuerySet): >> >> def serialize(self): >> print("UpdateQuerySet serialize") >> print(self.values("owner", "content", "image")) >> list_values = list(self.values("owner", "content", "image")) >> return json.dumps(list_values) >> >> >> class UpdateManager(models.Manager): >> >> def get_queryset(self): >> print('get_queryset method') >> return UpdateQuerySet(self.model, using=self._db) >> >> >> class BasicUserUpdate(models.Model): >> owner = >> models.ForeignKey(settings.AUTH_USER_MODEL,on_delete=models.CASCADE) >> content = models.TextField(blank=True,null=True) >> image = >> models.ImageField(blank=True,null=True,upload_to=upload_update_image,) >> updated = models.DateTimeField(auto_now=True) >> timestamp = models.DateTimeField(auto_now_add=True) >> >> def __str__(self): >> return self.content or '' >> >> objects = UpdateManager() >> >> >> def serialize(self): >> print("BasicUserUpdate serialize") >> try: >> image = self.image.url >> except: >> image = "" >> data = { >> "content": self.content, >> "owner": self.owner.id, >> "image": image >> } >> data = json.dumps(data) >> return data >> >> >> views.py >> >> from basic.models import BasicUserUpdate >> from django.views import View >> from django.http import HttpResponse >> >> >> class BasicUserUpdateListView(View): >> def get(self, request, *args, **kwargs): >> qs = BasicUserUpdate.objects.all() >> json_data = qs.serialize() >> return HttpResponse(json_data, content_type='application/json') >> >> class BasicUserUpdateDetailView(View): >> >> def get(self, request,id, *args, **kwargs): >> qs = BasicUserUpdate.objects.get(id=id) >> json_data = qs.serialize() >> return HttpResponse(json_data, content_type='application/json') >> >> ] >> >> >> *At run time calling ListView, get below print messages* >> get_queryset method >> UpdateQuerySet serialize >> >> *At run time calling DetailView, get below print messages* >> get_queryset method >> BasicUserUpdate serialize >> >> >> *How Django is identifying which serialize method to be called? * >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Django users" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] <javascript:>. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/django-users/3fdc04cb-5da9-4d6a-8935-3ebf9409196b%40googlegroups.com >> >> <https://groups.google.com/d/msgid/django-users/3fdc04cb-5da9-4d6a-8935-3ebf9409196b%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > -- You received this message because you are subscribed to the Google Groups "Django users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/560f2715-eae2-4dd7-9172-f71acd5368d7%40googlegroups.com.
