get_object_or_404 method in Django Models

Some functions are hard as well as boring to code each and every time. But Django users don’t have to worry about that because Django has some awesome built-in functions to make our work easy and enjoyable. Let’s discuss get_object_or_404() here.

How to use get_object_or_404() in a Django Project?

This function calls the given model and get object from that if that object or model doesn’t exist it raise 404 error.

 

Example:

Suppose we want to fetch 3rd product from the product model then we can use:

• Python3

 

# import get_object_or_404()

from django.shortcuts import get_object_or_404

 

 

# defining view

def product_view(request):

    #

retrieving product (pk is primary key)

    product = get_object_or_404(Products, pk=3)

 

This is the advantage of Django if you hardcode that then you have to write this much line of code:

 

• Python3

 

# import Http404

import Http404

from django.http import Http404

 

 

# defining view

def product_view(request):

 

 

    # try except logic

    try:

        product = Products.objects.get(pk=1)

    except Products.DoesNotExist:

        raise Http404("Given query not found....")

Using get_object_or_404() with QuerySet:

QuerySet instance is used to filter data while fetching from the database. For example, we want to fetch only shoes then we can write:

queryset = Products.objects.filter(type='shoes')
get_object_or_404(queryset)

We can simplify above example by a single line:

get_object_or_404(Products, type='shoes')