#Django-Basic  #Django 

Django Views

  • A view is a place where we put our business logic of the application
  • The view is a python function that takes a web request and returns a web response
  • This response can be the HTML contents of a Web page, or a redirect, or a 404 error

Types of Views

https://medium.com/@ksarthak4ever/django-class-based-views-vs-function-based-view-e74b47b2e41b

  • Django views are divided into two major categories:-
    • Function-Based Views
    • Class-Based Views

FAQ: Describe the use of Django’s class-based views over function-based views.

Function-Based Views

Function-Based Views is very easy to implement, and it’s very useful but the main disadvantage is that on a large Django project, usually a lot of similar functions in the views .

If all objects of a Django project usually have CRUD operations so this code is repeated again and again unnecessarily and this was one of the reasons that the class-based views and generic views were created for solving that problem.

# HttpResponse
from django.http import HttpResponse
import datetime

def current_datetime(request):
    now = datetime.datetime.now()
    html = "<html><body>It is now %s.</body></html>" % now
    return HttpResponse(html)

# render
from django.shortcuts import render

def home(request):
    context = { 'posts' : Posts.objects.all() }
    return  render(request, 'blog/home.html', context)

Class Based Views(CBVs)

They do not replace function-based views, but have certain differences and advantages when compared to function-based views

Pros

  • Code reuseability
  • DRY — Using CBVs help to reduce code duplication
  • Code extendability — CBV can be extended to include more functionalities using Mixins
from django.views.generic.list import ListView
from .models import Posts
 
class GeeksList(ListView):
 
    model = Posts

Django request

  • Use request instead of HttpRequest

Attributes

HttpRequest.scheme
# http or https

HttpRequest.body
# All details passed from FE

HttpRequest.path
# '/signup/'

HttpRequest.path_info
# '/signup/'

HttpRequest.method
# Type of request (GET, POST etc)

HttpRequest.content_type
# 'text/plain'
# 'application/x-www-form-urlencoded

HttpRequest.GET
# All GET data in Dict form

HttpRequest.POST
# All POST data in Dict form

HttpRequest.META
# A dictionary containing all available HTTP headers.

HttpRequest.headers
# A case insensitive, dict-like object that provides access to all 
# HTTP-prefixed headers (plus Content-Length and Content-Type)
# from the request.
        
HttpRequest.user
# user data

Methods

HttpRequest.get_host()
# '127.0.0.1:8000'

get_current_site(request).domain
# '127.0.0.1:8000'

HttpRequest.get_port()
HttpRequest.is_secure()
HttpRequest.get_signed_cookie('name')

HttpRequest.build_absolute_uri()
# 'http://127.0.0.1:8000/signup/'

HttpRequest.get_full_path()
# '/signup/'

views.py

from django.http import HttpResponse
from django.shortcuts import render, redirect

from django.contrib.auth.forms import (UserCreationForm, 
                    AuthenticationForm, PasswordChangeForm)
from django.contrib.auth.decorators import login_required

from django.contrib import messages

from django.contrib.auth import login, authenticate

forms.py

from django.contrib.auth.forms import UserCreationForm
from django.forms import ModelForm

Reference