fastapi - 💡(How to fix) Fix Add .cursorrules file to help Cursor IDE users follow FastAPI conventions [1 participants]

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fastapi/fastapi#15049Fetched 2026-04-08 00:21:36
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Proposal: Add a .cursorrules file for Cursor IDE contributors

Hi! I noticed the FastAPI repo does not have a .cursorrules file. FastAPI is hugely popular and many contributors use Cursor IDE. A .cursorrules file tells Cursor's AI assistant about the project's conventions, helping contributors write matching code from the start.

What .cursorrules does

It instructs Cursor's AI to follow your project's:

  • Coding style and naming conventions
  • Architectural patterns (dependency injection, Pydantic models, etc.)
  • Testing approach
  • Common patterns to follow and pitfalls to avoid

For FastAPI specifically this is valuable since Pydantic v2 + async patterns have non-obvious conventions new contributors often get wrong.

What I'd suggest

A .cursorrules for this repo could cover:

  • Pydantic v2 model patterns (model_config = ConfigDict(...), validators)
  • Depends() injection patterns
  • Async-first with asyncio.gather() for concurrent operations
  • pytest + httpx.AsyncClient testing patterns
  • Strict type annotation conventions (no implicit Any)

I maintain an open-source collection at https://github.com/survivorforge/cursor-rules that includes a python-fastapi rules file that could serve as a starting point.

Options

  1. I can submit a PR with a .cursorrules tailored to FastAPI's codebase conventions
  2. You can adapt the python-fastapi rules from our collection
  3. No action needed if you prefer to keep the repo lightweight

Free contribution, no strings attached.

extent analysis

Fix: Add a .cursorrules file to the repository

1️⃣ Create the file in the repo root

cd fastapi          # repo root
touch .cursorrules

2️⃣ Populate it with the core FastAPI conventions

Below is a minimal but useful starter that you can copy‑paste.
Feel free to extend it with the full rules from the linked collection.

# .cursorrules – Cursor IDE guidance for FastAPI contributors

# ----------------------------------------------------------------------
# General Python style
# ----------------------------------------------------------------------
style:
  line_length: 120
  import_sorting: isort
  type_checking: true          # enforce mypy/pyright strict mode
  no_implicit_any: true

# ----------------------------------------------------------------------
# FastAPI‑specific patterns
# ----------------------------------------------------------------------
fastapi:
  # Dependency injection
  depends:
    pattern: "def get_{{name}}(request: Request) -> {{type}}:"
    description: |
      Use `Depends()` for reusable resources (DB sessions, auth, etc.).
      Return concrete types, never `Any`.

  # Async route handlers
  async_route:
    pattern: |
      @router.get("/{{path}}")
      async def {{func_name}}(params: {{ParamsModel}}) -> {{ResponseModel}}:
          ...
    notes: |
      - All I/O should be `await`‑ed.
      - For parallel calls use `await asyncio.gather(*coros)`.

# ----------------------------------------------------------------------
# Pydantic v2 model conventions
# ----------------------------------------------------------------------
pydantic:
  base_model:
    config: |
      class Config:
          from_attributes =

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