Web Reference: Oct 20, 2022 · You have a typo in your configuration code. It is SQLALCHEMY_DATABASE_URI not SQLALCHEMY_DATABASE_URL. The RuntimeError: Either 'SQLALCHEMY_DATABASE_URI' or 'SQLALCHEMY_BINDS' must be set in Flask-SQLAlchemy is a configuration error. It means the extension was initialized with the Flask app before the necessary database connection string was set in app.config. Most applications will only have a single database and only need to use SQLALCHEMY_DATABASE_URI and SQLALCHEMY_ENGINE_OPTIONS. If the engine_options argument is given to SQLAlchemy, it sets default options for all engines.
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