61 lines
1.6 KiB
Python
61 lines
1.6 KiB
Python
from typing import TypeVar, Any, Dict, Generic, Callable
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from sqlalchemy import create_engine, Column, Integer
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from sqlalchemy.ext.declarative import declarative_base
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from sqlalchemy.orm import Session
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from sqlalchemy.sql.schema import Table
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from settings import DB_URL
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if DB_URL.startswith("sqlite"):
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engine = create_engine(DB_URL)
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else:
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engine = create_engine(
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DB_URL, echo=False, pool_size=10, max_overflow=20
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)
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T = TypeVar("T")
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REGISTRY: Dict[str, type] = {}
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def local_session():
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return Session(bind=engine, expire_on_commit=False)
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class Base(declarative_base()):
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__table__: Table
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__tablename__: str
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__new__: Callable
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__init__: Callable
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# qualify the base with __allow_unmapped__. Can also be
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# applied to classes directly if preferred
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__allow_unmapped__ = True
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__abstract__: bool = True
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__table_args__ = {"extend_existing": True}
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id: int = Column(Integer, primary_key=True)
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def __init_subclass__(cls, **kwargs):
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REGISTRY[cls.__name__] = cls
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@classmethod
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def create(cls: Generic[T], **kwargs) -> Generic[T]:
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instance = cls(**kwargs)
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return instance.save()
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def save(self) -> Generic[T]:
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with local_session() as session:
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session.add(self)
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session.commit()
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return self
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def update(self, input):
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column_names = self.__table__.columns.keys()
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for (name, value) in input.items():
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if name in column_names:
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setattr(self, name, value)
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def dict(self) -> Dict[str, Any]:
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column_names = self.__table__.columns.keys()
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return {c: getattr(self, c) for c in column_names}
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