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""" |
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byceps.services.shop.cart.models |
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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:Copyright: 2006-2021 Jochen Kupperschmidt |
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:License: Revised BSD (see `LICENSE` file for details) |
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""" |
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from __future__ import annotations |
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from dataclasses import dataclass, field |
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from decimal import Decimal |
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from ....util.instances import ReprBuilder |
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from ..article.transfer.models import Article |
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@dataclass(frozen=True) |
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class CartItem: |
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"""An article with a quantity.""" |
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article: Article |
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quantity: int |
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line_amount: Decimal = field(init=False) |
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def __post_init__(self) -> None: |
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if self.quantity < 1: |
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raise ValueError('Quantity must be a positive number.') |
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object.__setattr__(self, 'line_amount', self.article.price * self.quantity) |
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class Cart: |
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"""A shopping cart.""" |
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def __init__(self) -> None: |
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self._items: list[CartItem] = [] |
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def add_item(self, article: Article, quantity: int) -> None: |
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item = CartItem(article, quantity) |
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self._items.append(item) |
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def get_items(self) -> list[CartItem]: |
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return self._items |
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def calculate_total_amount(self) -> Decimal: |
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return sum(item.line_amount for item in self._items) |
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def is_empty(self) -> bool: |
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return not self._items |
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def __repr__(self) -> str: |
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item_count = len(self._items) |
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return ReprBuilder(self) \ |
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.add_custom(f'{item_count:d} items') \ |
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.build() |
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byceps /
byceps
