Flask route returning 500 scenarios with SQLAlchemy session scoped incorrectly across async function
I'm relatively new to this, so bear with me... This might be a silly question, but I'm wondering if anyone has experience with This might be a silly question, but I'm working with a 500 Internal Server behavior when trying to hit a specific route in my Flask application that uses SQLAlchemy for database interactions... I have an async function that fetches data from the database, and I'm using Flask with the Flask-SQLAlchemy extension. My code structure looks something like this: ```python from flask import Flask, jsonify from flask_sqlalchemy import SQLAlchemy from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine from sqlalchemy.orm import sessionmaker import asyncio app = Flask(__name__) app.config['SQLALCHEMY_DATABASE_URI'] = 'postgresql+asyncpg://user:password@localhost/dbname' app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False db_engine = create_async_engine(app.config['SQLALCHEMY_DATABASE_URI']) AsyncSessionLocal = sessionmaker(bind=db_engine, class_=AsyncSession, expire_on_commit=False) @app.route('/data') async def get_data(): async with AsyncSessionLocal() as session: async with session.begin(): result = await session.execute('SELECT * FROM my_table') data = result.scalars().all() return jsonify(data) if __name__ == '__main__': app.run(debug=True) ``` When I make a request to `/data`, the application throws a `500 Internal Server behavior`, and I can see the following in the logs: ``` sqlalchemy.exc.NoResultFound: No row was found for one() ``` I suspect it might be related to how I'm handling the SQLAlchemy session in the async function. I've tried wrapping my database calls in try-except blocks to catch exceptions, but the behavior seems to continue regardless. Additionally, I’ve ensured that the database is up and running, and the SQLAlchemy version I'm using is 1.4.25, which supports async functionality. I've also experimented with using synchronous calls within the async function and confirmed that the database connection is valid. However, the scenario remains elusive. Can anyone provide insights into what might be going wrong with my async session management or guide to debug this further? How would you solve this? I'm coming from a different tech stack and learning Python. Am I approaching this the right way? I'm working on a service that needs to handle this. I'd really appreciate any guidance on this.