Azimkin
52cbc1c2b3
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- Added `Cart` and `CartItem` models with migrations for managing user-specific carts and items - Developed services for cart-related operations: adding, removing, and updating cart items - Built specialized templates (`cart.html`) and styled them with new CSS assets (`cart.css`) - Enabled real-time UI updates via AJAX in shopping cart interactions (`cart.js`) - Modified header to dynamically display cart link with user authentication awareness - Added Leaflet-based interactive map to the contacts page and integrated CSS/JS dependencies - Expanded tests for cart functionality, item detail page cart integration, and contacts page maps
70 lines
2.1 KiB
Python
70 lines
2.1 KiB
Python
from decimal import Decimal
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from typing import Any
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from django.core.exceptions import ValidationError
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from django.utils import formats
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from items.models import Item
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from orders.models import Cart, CartItem
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def format_currency(value: Decimal) -> str:
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return f"{formats.number_format(value, 2)} руб."
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def get_or_create_cart(user: Any) -> Cart:
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cart, _ = Cart.objects.get_or_create(user=user)
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return cart
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def get_user_cart_item_ids(user: Any) -> set[int]:
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if not getattr(user, "is_authenticated", False):
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return set()
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return set(
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CartItem.objects.filter(cart__user=user).values_list("item_id", flat=True)
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)
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def get_user_cart(user: Any) -> Cart | None:
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if not getattr(user, "is_authenticated", False):
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return None
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return (
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Cart.objects.filter(user=user)
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.prefetch_related("items__item__images")
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.select_related("user")
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.first()
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)
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def add_item_to_cart(user: Any, item: Item, quantity: int = 1) -> tuple[CartItem, bool]:
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if quantity < 1:
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raise ValidationError("Количество товара должно быть не меньше 1.")
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if not item.is_available:
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raise ValidationError("Недоступный товар нельзя добавить в корзину.")
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cart = get_or_create_cart(user)
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cart_item, created = CartItem.objects.get_or_create(
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cart=cart,
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item=item,
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defaults={"quantity": quantity},
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)
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return cart_item, created
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def remove_item_from_cart(user: Any, item_id: int) -> bool:
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deleted, _ = CartItem.objects.filter(cart__user=user, item_id=item_id).delete()
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return bool(deleted)
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def update_cart_item_quantity(user: Any, item_id: int, quantity: int) -> CartItem:
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if quantity < 1:
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raise ValidationError("Количество товара должно быть не меньше 1.")
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cart_item = CartItem.objects.select_related("item").get(cart__user=user, item_id=item_id)
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cart_item.quantity = quantity
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cart_item.save(update_fields=["quantity", "updated_at"])
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return cart_item
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