FAST API

Type declarations

FastAPI uses the same declarations to:

  • Define requirements: from request path parameters, query parameters, headers, bodies, dependencies, etc.

  • Convert data: from the request to the required type.

  • Validate data

    coming from each request:

    • Generating automatic errors returned to the client when the data is invalid.

  • Document

    the API using OpenAPI:

    • which is then used by the automatic interactive documentation user interfaces.

Routing

  • path operation function
  • async def but for sqlalchemy it should be def
  • Starlette (and FastAPI) are based on AnyIO, which makes it compatible with both Python’s standard library asyncio and Trio.

SQL ALchemy

  • we should define both sqlalchemy models (extening Base = declarative_base())
  • for each model we should add a pydantic model for request / response validation

Dependency injection