Django Models get_object_or_404 Method Example
This article goes in detailed on django models get_object_or_404 method example. if you have question about how to use django get_object_or_404 then I will give simple example with solution. step by step explain django get_object_or_404 message. I explained simply about django get_object_or_404 custom message. Let's get started with django models get_object_or_404.
What is Django get_object_or_404 is a method that returns a 404 error if the object does not exist.
let's see bellow example here you will learn django models get_object_or_404 example.Step 1: Create a Model
In this step now go for the models we will We'll call our single model Comments and it will have just two fields: name, comment and date. And finally set __str__ to display the name of the comments.core/models.py
from django.db import models class Comments(models.Model): name = models.CharField(max_length=300) comment = models.TextField() date = models.DateField(auto_now_add=False) def __str__(self): return self.name
Ok, all set. We can engender a migrations file for this change, then integrate it to our database via migrate.
python manage.py makemigrations python manage.py migrate
Adding some records:
Step 2: Creating the Views
In this step, Let's try to get a record that's not exists with the get() method and see what happens. open the views.py file and add:views.py
from django.shortcuts import render from .models import Comments from django.http import HttpResponse # Create your views here. def get_comment(request): #get comment pk = 111 obj = Comments.objects.get(pk=111) return HttpResponse(obj)Output
In this step, let's do the same thing but now with the get_object_or_404 method and see the difference. open the views.py file and add:
If you want to get an object and you don't want to get an error when the record doesn't exist, you should use the get_object_or_404 methodviews.py
from django.shortcuts import get_object_or_404 from .models import Comments from django.http import HttpResponse # Create your views here. def get_comment(request): #get comment idpk = 111 obj = get_object_or_404(Comments, pk=111) return HttpResponse(obj)Output
Step 3: Customizing Django get_object_or_404 message
In this last As you know, we can't customize the get_object_or_404 method's error, but we can do it with the Http404 exception, let's see an example.views.py
from django.http import Http404 def get_comment(request): try: obj = Comments.objects.get(pk=111) except Comments.DoesNotExist: raise Http404("the obj does not exist.")Output
I Hope It will help you....
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