89 lines
2 KiB
Python
89 lines
2 KiB
Python
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from sqlalchemy.orm import Mapped, mapped_column, relationship
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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 ForeignKey, Integer, DateTime
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from datetime import datetime
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from .base import Base, CommonMixin
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from .product import Product
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from .entry import Entry
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class PresetEntry(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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preset_id: Mapped[int] = mapped_column(Integer, ForeignKey("preset.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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@property
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def fiber(self) -> float:
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"""fiber.
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:rtype: float
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"""
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return self.amount * self.product.fiber
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@classmethod
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async def create(
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self,
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session: AsyncSession,
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preset_id: int,
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entry: Entry,
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) -> None:
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pentry = PresetEntry(
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preset_id=preset_id,
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product_id=entry.product_id,
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grams=entry.grams,
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)
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session.add(pentry)
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try:
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await session.flush()
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except IntegrityError:
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raise AssertionError("preset or product does not exist")
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