from rest_framework import permissions


class IsOwner(permissions.BasePermission):
    """Allow only object owner to access."""

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)

from django.db import models
from django.contrib.postgres.indexes import GinIndex, BTreeIndex


class Order(models.Model):
    customer = models.ForeignKey('Customer', on_delete=models.CASCADE)

from django.db import transaction
from django.http import JsonResponse


@transaction.atomic
def transfer_funds(request):

# Optional: custom error handlers
handler404 = 'myapp.views.custom_404'
handler500 = 'myapp.views.custom_500'


# In views.py

from blog.models import Post


# Load only specific fields
posts = Post.objects.only('id', 'title', 'published_at')
for post in posts:

from django.db import migrations


def populate_slugs(apps, schema_editor):
    """Generate slugs for existing posts."""
    Post = apps.get_model('blog', 'Post')

import time
import logging

logger = logging.getLogger(__name__)

from products.models import Product


def import_products_bulk(product_data):
    """Import thousands of products efficiently."""
    products = [

from django.utils.translation import gettext_lazy as _

LANGUAGE_CODE = 'en-us'

LANGUAGES = [
    ('en', _('English')),

CACHES = {
    'default': {
        'BACKEND': 'django_redis.cache.RedisCache',
        'LOCATION': 'redis://127.0.0.1:6379/1',
        'OPTIONS': {
            'CLIENT_CLASS': 'django_redis.client.DefaultClient',

import graphene
from graphene_django import DjangoObjectType
from blog.models import Post, Comment


class PostType(DjangoObjectType):