128 lines
4.5 KiB
Python
128 lines
4.5 KiB
Python
from decimal import Decimal
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from django.conf import settings
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from product.models import Product
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from .models import Cart as CartModel, CartItem
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class Cart(object):
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def __init__(self, request):
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"""
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Initialize the cart.
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"""
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self.session = request.session
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self.user = request.user
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# Session cart initialization
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cart = self.session.get(settings.CART_SESSION_ID)
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if not cart:
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cart = self.session[settings.CART_SESSION_ID] = {}
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self.cart = cart
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def add(self, product, quantity=1, override_quantity=False):
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"""
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Add a product to the cart or update its quantity.
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"""
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if self.user.is_authenticated:
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self._add_db(product, quantity, override_quantity)
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else:
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self._add_session(product, quantity, override_quantity)
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def _add_session(self, product, quantity, override_quantity):
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product_id = str(product.id)
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if product_id not in self.cart:
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self.cart[product_id] = {'quantity': 0, 'price': str(product.price)}
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if override_quantity:
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self.cart[product_id]['quantity'] = quantity
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else:
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self.cart[product_id]['quantity'] += quantity
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if self.cart[product_id]['quantity'] <= 0:
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self.remove(product)
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else:
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self.save()
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def _add_db(self, product, quantity, override_quantity):
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cart, created = CartModel.objects.get_or_create(user=self.user)
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cart_item, item_created = CartItem.objects.get_or_create(cart=cart, product=product)
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if override_quantity:
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cart_item.quantity = quantity
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else:
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if not item_created:
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cart_item.quantity += quantity
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else:
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cart_item.quantity = quantity # Yeni oluşturulduysa zaten default 1 değil, gelen quantity olmalı
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if cart_item.quantity <= 0:
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cart_item.delete()
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else:
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cart_item.save()
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def save(self):
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# mark the session as "modified" to make sure it gets saved
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self.session.modified = True
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def remove(self, product):
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"""
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Remove a product from the cart.
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"""
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if self.user.is_authenticated:
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CartItem.objects.filter(cart__user=self.user, product=product).delete()
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else:
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product_id = str(product.id)
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if product_id in self.cart:
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del self.cart[product_id]
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self.save()
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def __iter__(self):
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"""
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Iterate over the items in the cart and get the products
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from the database.
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"""
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if self.user.is_authenticated:
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# DB'den oku
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cart, created = CartModel.objects.get_or_create(user=self.user)
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for item in cart.items.select_related('product').all():
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yield {
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'product': item.product,
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'quantity': item.quantity,
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'price': Decimal(item.product.price),
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'total_price': Decimal(item.product.price) * item.quantity
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}
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else:
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# Session'dan oku
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product_ids = self.cart.keys()
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products = Product.objects.filter(id__in=product_ids)
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cart = self.cart.copy()
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for product in products:
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cart[str(product.id)]['product'] = product
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for item in cart.values():
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item['price'] = Decimal(item['price'])
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item['total_price'] = item['price'] * item['quantity']
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yield item
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def __len__(self):
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"""
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Count all items in the cart.
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"""
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if self.user.is_authenticated:
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cart, created = CartModel.objects.get_or_create(user=self.user)
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return sum(item.quantity for item in cart.items.all())
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else:
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return sum(item['quantity'] for item in self.cart.values())
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def get_total_price(self):
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if self.user.is_authenticated:
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cart, created = CartModel.objects.get_or_create(user=self.user)
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return sum(item.total_price for item in cart.items.all())
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else:
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return sum(Decimal(item['price']) * item['quantity'] for item in self.cart.values())
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def clear(self):
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if self.user.is_authenticated:
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cart, created = CartModel.objects.get_or_create(user=self.user)
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cart.items.all().delete()
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else:
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del self.session[settings.CART_SESSION_ID]
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self.save()
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