Django With Praveen

  REpresentational State Transfer + Application Programming Interface REST API allows different applications (like mobile apps, frontend, backend) to talk to each other over the internet using HTTP methods (like GET, POST, PUT, DELETE). What is REST API in Django? In Django, you can create REST APIs using the library called Django REST Framework (DRF). With REST API in Django, you can: Send data to the backend (POST) Get data from the backend (GET) Update existing data (PUT/PATCH) Delete data (DELETE) pip install djangorestframework INSTALLED_APPS = [   ...   ' rest_framework ', ] | Method | Endpoint | Purpose | Example | | ------ | ------------------------- | -------------------- | ----------- | | GET | `/ api /students/` | Get all students | List view | | GET | `/ api /students/1/` | Get 1 student (id=1) | Detail view | | POST | `/ api /students/create/` | Create new student | Add | | PUT ...

 What is Middleware? Middleware is a special layer in Django that processes every request and response globally before or after the view is called. It acts like a filter, gatekeeper or security guard in a web app. 🧠 Why is Middleware Important? Task Done using Middleware Block specific users ✅ Auto login redirect ✅ Theme (dark/light) toggle ✅ Add info to response/request ✅ Language / Location detection ✅ ⚙️ How Middleware Works in Django Browser → Middleware → View → Middleware → Response → Browser pip install django-ipware ✅ Step 1: Create Middleware File 📁 Create middleware.py in your Django app (e.g., main/middleware.py ) from ipware import get_client_ip from django . http import HttpResponse class BlockForeignMiddleware :     def __init__ ( self , get_response ):         self . get_response = get_response     def __call__ ( self , request ):         ip , _ = get_client_ip...

 Cookie Cookie is a small piece of data that a website saves in your browser to remember you or your preferences (like name, login status, language, etc.). 🧑‍💻 1. views.py from django.http import HttpResponse # Set Cookie def set_cookie(request):     response = HttpResponse("Cookie has been set")     response.set_cookie('user_name', 'Raj', max_age=3600)  # expires in 1 hour     return response # Get Cookie def get_cookie(request):     name = request.COOKIES.get('user_name')  # read cookie     return HttpResponse(f"Hello {name}") 🛣️ 2. urls.py from django.urls import path from . import views urlpatterns = [     path('set-cookie/', views.set_cookie),     path('get-cookie/', views.get_cookie), ] ✅ Session Definition Session is a way to store data on the server to remember the user between different pages (like login info, user ID, cart items, etc.) from django.http import HttpResponse # Set Session d...

  authdemo/ │ ├── authdemo/           ← Project folder │   └── urls.py │ ├── users/              ← Custom user app │   ├── views.py │   ├── forms.py │   ├── urls.py │   └── templates/ │       └── users/ │           ├── login.html │           └── home.html │ └── manage.py Step 1: Project Setup django-admin startproject authdemo cd authdemo python manage.py startapp users ✅ Step 2: Add App to settings.py # authdemo/settings.py INSTALLED_APPS = [ ..., 'users', 'django.contrib.auth', 'django.contrib.sessions', ] ✅ Step 3: Create Profile Model # users/models.py from django . db import models from django . contrib . auth . models import User class Profile ( models . Model ):     user = models . OneToOneField ( User , on_delete = models . CASCADE )   ...

  Step 1: Create a Django Project django-admin startproject auth_demo cd auth_demo python manage.py startapp accounts 🧩 Step 2: Add App to settings.py INSTALLED_APPS = [     ...     'accounts',     'django.contrib.sessions',     'django.contrib.auth',     ... ] Also, add login URL if you want: LOGIN_URL = '/login/' 🧱 Step 3: Create URL Routes Create a file accounts/urls.py # accounts/urls.py from django . urls import path from . import views urlpatterns = [     path ( 'register/' , views .register_view, name = 'register' ),     path ( 'login/' , views .login_view, name = 'login' ),     path ( 'logout/' , views .logout_view, name = 'logout' ),     path ( 'dashboard/' , views .dashboard_view, name = 'dashboard' ), ] Now include this in the main urls.py : # auth_demo/urls.py from django . contrib import admin from django . urls import path , include urlpatterns = [    ...

from django . db import models class Book ( models . Model ): title = models . CharField ( max_length = 200 ) author = models . CharField ( max_length = 100 ) published_date = models . DateField () def __str__ ( self ): return self . title from django import forms from . models import Book class BookForm ( forms . ModelForm ): published_date = forms . DateField ( widget = forms . DateInput ( attrs = { 'type' : 'date' }) ) class Meta : model = Book fields = [ 'title' , 'author' , 'published_date' ]      from django . urls import path from . import views urlpatterns = [ path ( '' , views . book_list , name = 'book_list' ), path ( 'create/' , views . book_create , name = 'book_create' ), path ( 'update/<int:pk>/' , views . book_update , name = 'book_update' ), path ( 'delete/<int:pk...