123 lines
3.2 KiB
Python
123 lines
3.2 KiB
Python
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from sqlalchemy.orm import Mapped, mapped_column, relationship, joinedload
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from sqlalchemy import ForeignKey, Integer, DateTime
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from sqlalchemy.ext.asyncio import AsyncSession
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from sqlalchemy.exc import IntegrityError
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from sqlalchemy import select
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from datetime import datetime
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from typing import Optional
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from .base import Base, CommonMixin
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from .product import Product
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class Entry(Base, CommonMixin):
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"""Entry."""
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grams: Mapped[float]
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product_id: Mapped[int] = mapped_column(Integer, ForeignKey("product.id"))
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product: Mapped[Product] = relationship(lazy="selectin")
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meal_id: Mapped[int] = mapped_column(Integer, ForeignKey("meal.id"))
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last_changed: Mapped[datetime] = mapped_column(
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DateTime, default=datetime.utcnow, onupdate=datetime.utcnow
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)
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@property
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def amount(self) -> float:
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"""amount.
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:rtype: float
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"""
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return self.grams / 100
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@property
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def calories(self) -> float:
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"""calories.
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:rtype: float
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"""
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return self.amount * self.product.calories
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@property
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def protein(self) -> float:
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"""protein.
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:rtype: float
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"""
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return self.amount * self.product.protein
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@property
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def carb(self) -> float:
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"""carb.
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:rtype: float
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"""
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return self.amount * self.product.carb
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@property
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def fat(self) -> float:
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"""fat.
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:rtype: float
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"""
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return self.amount * self.product.fat
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@classmethod
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async def create(
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cls, session: AsyncSession, meal_id: int, product_id: int, grams: float
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) -> "Entry":
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"""create."""
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assert grams > 0, "grams must be greater than 0"
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entry = Entry(
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meal_id=meal_id,
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product_id=product_id,
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grams=grams,
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)
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session.add(entry)
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try:
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await session.flush()
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except IntegrityError:
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raise AssertionError("meal or product does not exist")
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entry = await cls.get_by_id(session, entry.id)
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if not entry:
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raise RuntimeError()
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return entry
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async def update(
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self,
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session: AsyncSession,
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meal_id: Optional[int],
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product_id: Optional[int],
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grams: Optional[float],
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) -> None:
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"""update."""
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if grams is not None:
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assert grams > 0, "grams must be greater than 0"
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self.grams = grams
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if meal_id is not None:
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self.meal_id = meal_id
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try:
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session.flush()
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except IntegrityError:
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raise AssertionError("meal does not exist")
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if product_id is not None:
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self.product_id = product_id
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try:
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session.flush()
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except IntegrityError:
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raise AssertionError("product does not exist")
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@classmethod
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async def get_by_id(cls, session: AsyncSession, id: int) -> "Optional[Entry]":
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"""get_by_id."""
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query = select(cls).where(cls.id == id).options(joinedload(cls.product))
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return await session.scalar(query.order_by(cls.id))
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async def delete(self, session) -> None:
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"""delete."""
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await session.delete(self)
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await session.flush()
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