FastAPI's Depends: Let the Framework Handle Setup
Think of `Depends` as a pre-flight checklist for your API endpoints. You list required setup tasks, like getting a user or a database session, and FastAPI runs them for you. This is key for sharing logic like auth or database connections across many routes.
Think of FastAPI's `Depends` as a pre-flight checklist for your API endpoints. You declare required setup tasks—like fetching the current user or opening a database session—and FastAPI automatically executes them and "injects" the results into your function. This is essential for sharing common logic without repetition, like for database connections or user authentication. The main footgun is passing the function's result instead of the function itself: use `Depends(get_db)`, not `Depends(get_db())`.
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