106 lines
3.1 KiB
Python
106 lines
3.1 KiB
Python
from sqlalchemy.orm import Mapped
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from sqlalchemy import select
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from sqlalchemy.ext.asyncio import AsyncSession
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from typing import AsyncIterator, Optional
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from .base import Base, CommonMixin
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class Product(Base, CommonMixin):
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"""Product."""
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name: Mapped[str]
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protein: Mapped[float]
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carb: Mapped[float]
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fat: Mapped[float]
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fiber: Mapped[float]
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hard_coded_calories: Mapped[Optional[float]] = None
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barcode: Mapped[Optional[str]] = None
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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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if self.hard_coded_calories:
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return self.hard_coded_calories
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return self.protein * 4 + self.carb * 4 + self.fat * 9 + self.fiber * 2
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@classmethod
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async def list_all(
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cls,
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session: AsyncSession,
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offset: int,
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limit: int,
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q: Optional[str] = None,
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) -> AsyncIterator["Product"]:
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query = select(cls)
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if q:
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q_list = q.split()
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for qq in q_list:
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query = query.filter(cls.name.ilike(f"%{qq.lower()}%"))
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query = query.offset(offset).limit(limit)
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stream = await session.stream_scalars(query.order_by(cls.id))
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async for row in stream:
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yield row
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@classmethod
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async def get_by_barcode(
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cls, session: AsyncSession, barcode: str
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) -> Optional["Product"]:
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query = select(cls).where(cls.barcode == barcode)
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return await session.scalar(query)
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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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name: str,
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carb: float,
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protein: float,
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fat: float,
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fiber: float,
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hard_coded_calories: Optional[float] = None,
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barcode: Optional[str] = None,
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) -> "Product":
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# validation here
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assert carb <= 100, "carb must be less than 100"
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assert protein <= 100, "protein must be less than 100"
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assert fat <= 100, "fat must be less than 100"
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assert fiber <= 100, "fiber must be less than 100"
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assert carb >= 0, "carb must be greater than 0"
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assert protein >= 0, "protein must be greater than 0"
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assert fat >= 0, "fat must be greater than 0"
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assert fiber >= 0, "fiber must be greater than 0"
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assert carb + protein + fat <= 100, "total must be less than 100"
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# to avoid duplicates in the database keep name as lower
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name = name.lower()
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# check if product already exists
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if barcode is not None:
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query = select(cls).where((cls.name == name) | (cls.barcode == barcode))
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else:
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query = select(cls).where(cls.name == name)
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existing_product = await session.scalar(query)
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assert existing_product is None, "product already exists"
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product = Product(
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name=name,
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protein=protein,
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carb=carb,
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fat=fat,
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fiber=fiber,
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hard_coded_calories=hard_coded_calories,
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barcode=barcode,
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)
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session.add(product)
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await session.flush()
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return product
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