109 lines
2.6 KiB
Python
109 lines
2.6 KiB
Python
from typing import Type, TypeVar
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from sqlalchemy.exc import SQLAlchemyError
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from sqlalchemy.orm import Session
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from fastapi import status
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from fastapi.exceptions import HTTPException
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from Services.PostgresService.database import get_db
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# Type variable for class methods returning self
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T = TypeVar("T", bound="FilterAttributes")
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class BaseAlchemyModel:
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"""
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Controller of alchemy to database transactions.
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Query: Query object for model
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Session: Session object for model
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Actions: save, flush, rollback, commit
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"""
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__abstract__ = True
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@classmethod
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def new_session(cls) -> Session:
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"""Get database session."""
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with get_db() as session:
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return session
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@classmethod
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def flush(cls: Type[T], db: Session) -> T:
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"""
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Flush the current session to the database.
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Args:
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db: Database session
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Returns:
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Self instance
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Raises:
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HTTPException: If database operation fails
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"""
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try:
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db.flush()
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return cls
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except SQLAlchemyError as e:
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raise HTTPException(
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status_code=status.HTTP_406_NOT_ACCEPTABLE,
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detail={
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"message": "Database operation failed",
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},
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)
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def destroy(self: Type[T], db: Session) -> None:
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"""
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Delete the record from the database.
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Args:
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db: Database session
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"""
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db.delete(self)
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@classmethod
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def save(cls: Type[T], db: Session) -> None:
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"""
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Commit changes to database.
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Args:
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db: Database session
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Raises:
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HTTPException: If commit fails
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"""
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try:
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db.commit()
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db.flush()
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except SQLAlchemyError as e:
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db.rollback()
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raise HTTPException(
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status_code=status.HTTP_406_NOT_ACCEPTABLE,
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detail={
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"message": "Alchemy save operation failed",
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"error": str(e),
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},
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)
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except Exception as e:
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db.rollback()
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raise HTTPException(
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status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
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detail={
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"message": "Unknown exception raised.",
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"error": str(e),
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},
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)
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@classmethod
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def rollback(cls: Type[T], db: Session) -> None:
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"""
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Rollback current transaction.
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Args:
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db: Database session
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"""
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db.rollback()
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