AgentSkillsCN

fastapi-dependencies

在FastAPI中处理请求、响应、头部信息、Cookie，以及文件上传的详细指南。当您的查询涉及数据校验、响应生成，或请求组件的处理时，此技能定能助您一臂之力。

SKILL.md
--- frontmatter
name: fastapi-dependencies
description: Step-by-step guide for using dependencies, dependency injection, and caching in FastAPI. Trigger for queries about reusable logic, auth checks, or database sessions.

Instructions for FastAPI Dependencies

Manage dependencies in FastAPI:

  1. •

    Defining Dependencies:

    • •Functions: def common_parameters(q: str = None): return {"q": q}.
    • •Classes: With __call__ method.
  2. •

    Injection:

    • •In paths: @app.get("/items/", dependencies=[Depends(common_parameters)]).
    • •In params: def get_items(commons: dict = Depends(common_parameters)): ....
  3. •

    Sub-Dependencies:

    • •Nest: def sub_dep(): ... then def main_dep(sub=Depends(sub_dep)): ....
  4. •

    Caching:

    • •Automatic per request.
    • •Override with cached=False in Depends.
  5. •

    Scopes:

    • •Application, router, or path level.
    • •Use for DB sessions: Yield for cleanup.
  6. •

    Best Practices:

    • •Use for authentication, logging, rate limiting.
    • •Async dependencies for async code.
    • •Test dependencies separately.

References

Use the shared references located at: ../_shared/reference.md