Django REST Framework

# Install: pip install djangorestframework djangorestframework-simplejwt

# settings.py
INSTALLED_APPS = ['rest_framework', 'rest_framework_simplejwt']
REST_FRAMEWORK = {
    'DEFAULT_AUTHENTICATION_CLASSES': [
        'rest_framework_simplejwt.authentication.JWTAuthentication',
    ],
    'DEFAULT_PERMISSION_CLASSES': ['rest_framework.permissions.IsAuthenticated'],
    'DEFAULT_PAGINATION_CLASS': 'rest_framework.pagination.PageNumberPagination',
    'PAGE_SIZE': 20,
}

# serializers.py
from rest_framework import serializers
from .models import Post, User

class UserSerializer(serializers.ModelSerializer):
    class Meta:
        model = User
        fields = ['id', 'username', 'email']
        read_only_fields = ['id']

class PostSerializer(serializers.ModelSerializer):
    author = UserSerializer(read_only=True)
    author_id = serializers.IntegerField(write_only=True)

    class Meta:
        model = Post
        fields = ['id', 'title', 'content', 'author', 'author_id', 'created_at']

    def validate_title(self, value):
        if len(value) < 5:
            raise serializers.ValidationError("Title must be at least 5 characters")
        return value

# views.py — ViewSet (auto-generates all endpoints)
from rest_framework import viewsets, permissions, filters
from rest_framework.decorators import action
from rest_framework.response import Response

class PostViewSet(viewsets.ModelViewSet):
    queryset = Post.objects.select_related('author').all()
    serializer_class = PostSerializer
    permission_classes = [permissions.IsAuthenticatedOrReadOnly]
    filter_backends = [filters.SearchFilter, filters.OrderingFilter]
    search_fields = ['title', 'content']
    ordering_fields = ['created_at', 'title']

    def perform_create(self, serializer):
        serializer.save(author=self.request.user)

    @action(detail=True, methods=['post'])
    def publish(self, request, pk=None):
        post = self.get_object()
        post.status = 'published'
        post.save()
        return Response({'status': 'published'})

# urls.py — Router auto-generates all URLs
from rest_framework.routers import DefaultRouter
from rest_framework_simplejwt.views import TokenObtainPairView, TokenRefreshView

router = DefaultRouter()
router.register(r'posts', PostViewSet)

urlpatterns = [
    path('api/', include(router.urls)),
    path('api/auth/login/', TokenObtainPairView.as_view()),
    path('api/auth/refresh/', TokenRefreshView.as_view()),
]
# Generates: GET/POST /api/posts/, GET/PUT/PATCH/DELETE /api/posts/{id}/