Django Examples - SyntaxRecall

Getting Started

# Install Django
pip install django

# Start a new project
django-admin startproject myproject

# Run the development server
cd myproject
python manage.py runserver

Creating an App

# Create an app within the project
python manage.py startapp myapp

Models

# myapp/models.py
from django.db import models

class Post(models.Model):
    title = models.CharField(max_length=200)
    content = models.TextField()
    created_at = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return self.title

Migrations

# Generate migrations for the app
python manage.py makemigrations

# Apply migrations to the database
python manage.py migrate

Views

# myapp/views.py
from django.shortcuts import render
from .models import Post

def index(request):
    posts = Post.objects.all()
    return render(request, 'index.html', {'posts': posts})

URLs

# myproject/urls.py
from django.contrib import admin
from django.urls import path, include

urlpatterns = [
    path('admin/', admin.site.urls),
    path('', include('myapp.urls')),
]

# myapp/urls.py
from django.urls import path
from . import views

urlpatterns = [
    path('', views.index, name='index'),
]

Templates

<!-- templates/index.html -->
<!DOCTYPE html>
<html>
<head>
    <title>My Blog</title>
</head>
<body>
    <h1>Posts</h1>
    <ul>
        {% for post in posts %}
            <li>{{ post.title }} - {{ post.created_at }}</li>
        {% endfor %}
    </ul>
</body>
</html>

Django Authentication Setup

Learn how to set up user authentication in Django, including login, logout, and registration functionality.

Authentication Settings

# settings.py
INSTALLED_APPS = [
    'django.contrib.auth',
    'django.contrib.contenttypes',
]
AUTHENTICATION_BACKENDS = [
    'django.contrib.auth.backends.ModelBackend',
]

# urls.py
from django.contrib.auth import views as auth_views
urlpatterns = [
    path('login/', auth_views.LoginView.as_view(), name='login'),
    path('logout/', auth_views.LogoutView.as_view(), name='logout'),
]

Register a New User

# views.py
from django.contrib.auth.forms import UserCreationForm
from django.shortcuts import render, redirect

def register(request):
    if request.method == 'POST':
        form = UserCreationForm(request.POST)
        if form.is_valid():
            form.save()
            return redirect('login')
    else:
        form = UserCreationForm()
    return render(request, 'register.html', {'form': form})

# templates/register.html
<form method="post">
    {% csrf_token %}
    {{ form.as_p }}
    <button type="submit">Sign Up</button>
</form>

Django REST API Basics

Set up a basic REST API using Django REST Framework (DRF).

Install Rest Framework

pip install djangorestframework

Create and Serialize Models

# models.py
class Book(models.Model):
    title = models.CharField(max_length=255)
    author = models.CharField(max_length=255)

# serializers.py
from rest_framework import serializers
from .models import Book
class BookSerializer(serializers.ModelSerializer):
    class Meta:
        model = Book
        fields = '__all__'

API Views

# api_views.py
from rest_framework.decorators import api_view
from rest_framework.response import Response
from .models import Book
from .serializers import BookSerializer

@api_view(['GET', 'POST'])
def book_list(request):
    if request.method == 'GET':
        books = Book.objects.all()
        serializer = BookSerializer(books, many=True)
        return Response(serializer.data)
    elif request.method == 'POST':
        serializer = BookSerializer(data=request.data)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data, status=201)