python
44 lines · 1 tab
Priya Sharma
Jan 2026
1 tab
from functools import wraps
from django.http import JsonResponse
from django.core.cache import cache
def ajax_required(view_func):
"""Decorator to ensure request is AJAX."""
@wraps(view_func)
def wrapper(request, *args, **kwargs):
if not request.headers.get('X-Requested-With') == 'XMLHttpRequest':
return JsonResponse({'error': 'AJAX required'}, status=400)
return view_func(request, *args, **kwargs)
return wrapper
def rate_limit(key_prefix, limit=10, period=60):
"""Simple rate limiting decorator."""
def decorator(view_func):
@wraps(view_func)
def wrapper(request, *args, **kwargs):
# Create cache key from IP or user
if request.user.is_authenticated:
cache_key = f'{key_prefix}:{request.user.id}'
else:
cache_key = f'{key_prefix}:{request.META.get("REMOTE_ADDR")}'
# Check rate limit
count = cache.get(cache_key, 0)
if count >= limit:
return JsonResponse({'error': 'Rate limit exceeded'}, status=429)
# Increment counter
cache.set(cache_key, count + 1, period)
return view_func(request, *args, **kwargs)
return wrapper
return decorator
# Usage
@ajax_required
@rate_limit('api_endpoint', limit=100, period=3600)
def my_api_view(request):
return JsonResponse({'status': 'ok'})
1 file · python
Explain with highlit
Custom decorators encapsulate reusable view logic. I use functools.wraps to preserve function metadata. For class-based views, I use method_decorator. Common patterns include permission checks, rate limiting, or request validation. Decorators can modify request/response or short-circuit with early returns. I stack multiple decorators carefully—order matters. For complex logic, middleware might be better than decorators. This keeps views clean and promotes code reuse across endpoints.
Related snips
python
import os
import stat
for root, _dirs, files in os.walk('/etc'):
for name in files:
path = os.path.join(root, name)Python security audit script for exposed risky filesystem state
python
auditing
host-security
by Kai Nakamura
1 tab
python
class Product(models.Model):
name = models.CharField(max_length=200)
slug = models.SlugField(blank=True)
price = models.DecimalField(max_digits=10, decimal_places=2)
cost = models.DecimalField(max_digits=10, decimal_places=2)
margin = models.DecimalField(max_digits=5, decimal_places=2, blank=True)Django model signals vs overriding save
django
python
models
by Priya Sharma
2 tabs
python
from django.urls import path
from . import views
app_name = 'blog'
urlpatterns = [Django URL namespacing and reverse lookups
django
python
urls
by Priya Sharma
3 tabs
python
import graphene
from graphene_django import DjangoObjectType
from blog.models import Post, Comment
class PostType(DjangoObjectType):Django GraphQL with Graphene
django
python
graphql
by Priya Sharma
2 tabs
python
from django.db.models import Count, Avg, Sum, Q, F
from django.views.generic import TemplateView
from products.models import Product, Order, OrderItem
class DashboardView(TemplateView):Django aggregation with annotate for statistics
django
python
database
by Priya Sharma
1 tab
python
from rest_framework import permissions
class IsOwner(permissions.BasePermission):
"""Allow only object owner to access."""Django REST Framework permissions and authorization
django
python
rest
by Priya Sharma
2 tabs
Share this code
Here's the card — post it anywhere.
