Django ORM and Caching for Order Totals Calculation

This function uses Django ORM and the caching framework to calculate the total number of orders for a given date. It first attempts to retrieve the data from the cache, and if not found, it calculates the result from the database and caches it.

Technology Stack : Django, ORM, Caching framework

Code Type : Function

Code Difficulty : Intermediate

                
                    
import random
from django.core.cache import cache
from django.db.models import Sum
from django.utils.timezone import now

def calculate_total_orders_by_date(date):
    # This function calculates the total number of orders by date using Django ORM and caching.
    # It uses Django's cache framework to store the results for faster retrieval.

    # Check if the data is already in the cache
    cache_key = f"total_orders_{date.strftime('%Y-%m-%d')}"
    total_orders = cache.get(cache_key)

    # If the data is not in the cache, calculate it
    if total_orders is None:
        from django.contrib.auth.models import User
        from myapp.models import Order

        # Filter orders by the given date
        orders = Order.objects.filter(date__range=(date, date + timedelta(days=1)))

        # Aggregate the total number of orders
        total_orders = orders.aggregate(Sum('quantity'))['quantity__sum'] or 0

        # Store the result in the cache
        cache.set(cache_key, total_orders, timeout=3600)  # Cache for 1 hour

    return total_orders