get openapi description

exception_handler.py

@app.exception_handler(RequestValidationError)
async def validation_exception_handler(request, exc):
    res = dict(message="validation error")
    req_url = request.url
    routes = app.routes
    path = str(req_url).replace("http://testserver", "")
    logger.debug(f"url: {req_url}")
    logger.debug(f"path: {path}")
    for route in routes:
        logger.debug(f"route: {route} {route.path_regex} {route.methods}")
        if route.path_regex.match(path) and request.method in route.methods:
            logger.debug(f"********************route: {route}")
            url = route.path

            # path_spec = app.openapi()["paths"]["/pet/{id}"]
            path_spec = app.openapi()["paths"][url]
            req_body = path_spec["put"]["requestBody"]
            model = req_body["content"]["application/json"]["schema"]["$ref"]
            model_name = model.lstrip("#/components/schemas/")

            from fastapi_test import models
            Model = vars(models)[model_name]
            name_field=Model.model_fields["name"]
            logger.debug(f"name field: {name_field} {dir(name_field)}")
            logger.debug(f"name desc: {name_field.description}")

    return JSONResponse(res, status_code=400)