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 <arjitk.gu...@gmail.com>
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? *
>
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