84 lines
2.3 KiB
Python
84 lines
2.3 KiB
Python
from sqlalchemy.orm import relationship, Mapped, mapped_column, joinedload
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from sqlalchemy import ForeignKey, Integer
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from sqlalchemy import select
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from sqlalchemy.ext.asyncio import AsyncSession
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from sqlalchemy.exc import IntegrityError
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from typing import Optional
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from .base import Base, CommonMixin
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from .entry import Entry
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class Meal(Base, CommonMixin):
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"""Meal."""
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name: Mapped[str]
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order: Mapped[int]
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diary_id: Mapped[int] = mapped_column(Integer, ForeignKey("diary.id"))
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entries: Mapped[list[Entry]] = relationship(lazy="selectin", order_by=Entry.last_changed)
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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 sum(entry.calories for entry in self.entries)
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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 sum(entry.protein for entry in self.entries)
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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 sum(entry.carb for entry in self.entries)
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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 sum(entry.fat for entry in self.entries)
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@classmethod
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async def create(
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cls,
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session: AsyncSession,
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diary_id: int,
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order: int = 0,
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name: Optional[str] = None,
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) -> "Meal":
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# check if order already exists in diary
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query = select(cls).where(cls.diary_id == diary_id).where(cls.order == order)
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existing_meal = await session.scalar(query)
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assert existing_meal is None, "order already exists in diary"
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if name is None:
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name = f"Meal {order}"
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meal = Meal(diary_id=diary_id, name=name, order=order)
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session.add(meal)
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try:
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await session.flush()
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except IntegrityError:
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raise AssertionError("diary does not exist")
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meal = await cls.get_by_id(session, meal.id)
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if not meal:
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raise RuntimeError()
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return meal
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@classmethod
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async def get_by_id(cls, session: AsyncSession, id: int) -> "Optional[Meal]":
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"""get_by_id."""
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query = select(cls).where(cls.id == id).options(joinedload(cls.entries))
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return await session.scalar(query.order_by(cls.id))
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