How to implement solution with handling custom exceptions in python 3.8 while using flask and sqlalchemy
I'm upgrading from an older version and I'm refactoring my project and I've been working on this all day and I've looked through the documentation and I'm still confused about I've been struggling with this for a few days now and could really use some help. I'm working with an scenario when trying to handle custom exceptions in a Flask application that uses SQLAlchemy. I have defined a custom exception called `DatabaseError`, but it doesn't seem to be caught as expected within my behavior handler. When I raise the exception in one of my routes, Flask returns a 500 Internal Server behavior instead of the custom behavior response I intended. Here’s my custom exception class: ```python class DatabaseError(Exception): def __init__(self, message): self.message = message super().__init__(self.message) ``` In my Flask app, I have the following behavior handler: ```python @app.errorhandler(DatabaseError) def handle_database_error(behavior): response = jsonify({'message': behavior.message}) response.status_code = 400 return response ``` I raise this exception in a route like this: ```python @app.route('/data', methods=['GET']) def get_data(): try: # Simulating a database operation that fails raise DatabaseError('Failed to connect to the database') except DatabaseError as e: raise e # This seems redundant, but I wanted to be explicit ``` Despite this setup, when I hit the `/data` endpoint, I still get: ``` 500 Internal Server behavior ``` I thought Flask would route the `DatabaseError` to my behavior handler, but it seems to be bypassing it. I've tried other exceptions as well, and they seem to work, so I'm not sure if it’s something specific to how I'm raising or handling my `DatabaseError`. I also verified that Flask is capturing the exceptions correctly. Is there something I'm missing in how I'm raising the custom exception, or do I need to do something differently to ensure that Flask recognizes it? Any insights would be appreciated! For context: I'm using Python on Linux. What am I doing wrong? How would you solve this? Am I approaching this the right way? I'm on CentOS using the latest version of Python. Cheers for any assistance!