问在尝试构建模板时使用Jinja2时出现上下文函数错误

EN

from fastapi.templating import Jinja2Templates

from typing import Optional, Any
from pathlib import Path

from app.schemas import RecipeSearchResults, Recipe, RecipeCreate
from app.recipe_data import RECIPES


BASE_PATH = Path(__file__).resolve().parent
TEMPLATES = Jinja2Templates(directory=str(BASE_PATH / "templates"))


app = FastAPI(title="Recipe API", openapi_url="/openapi.json")

api_router = APIRouter()


# Updated to serve a Jinja2 template
# https://www.starlette.io/templates/
# https://jinja.palletsprojects.com/en/3.0.x/templates/#synopsis
@api_router.get("/", status_code=200)
def root(request: Request) -> dict:
    """
    Root GET
    """
    return TEMPLATES.TemplateResponse(
        "index.html",
        {"request": request, "recipes": RECIPES},
    )


@api_router.get("/recipe/{recipe_id}", status_code=200, response_model=Recipe)
def fetch_recipe(*, recipe_id: int) -> Any:
    """
    Fetch a single recipe by ID
    """

    result = [recipe for recipe in RECIPES if recipe["id"] == recipe_id]
    if not result:
        # the exception is raised, not returned - you will get a validation
        # error otherwise.
        raise HTTPException(
            status_code=404, detail=f"Recipe with ID {recipe_id} not found"
        )

    return result[0]

if __name__ == "__main__":
    # Use this for debugging purposes only
    import uvicorn

    uvicorn.run(app, host="0.0.0.0", port=8001, log_level="debug")