使用express、mongodb时出现错误“将循环结构转换为JSON”

Question

我正在尝试查找特定距离内的旅行。这是我的代码

exports.getTourWithin = catchAsync(async (req, res, next) => {
  const { distance, latlng, unit } = req.params;
  const [lat, lng] = latlng.split(',');
  if (!lat || !lng) {
    next(
      new AppError(
        `please provide latitude amd longitude in the form of lat,lng`,
        400
      )
    );
  }
  const radius = unit === 'mi' ? distance / 3963.2 : distance / 6378.1;

  const tours = Tour.find({
    $geoWithin: { $centerSphere: [[lng, lat], radius] }
  });
  res.status(200).json({
    status: 'success',
    data: {
      data: tours
    }
  });
});

但我在邮递员中收到此错误：

"message": "Converting circular structure to JSON\n    --> starting at object with constructor 'NativeTopology'\n    |     property 's' -> object with constructor 'Object'\n    |     property 'sessionPool' -> object with constructor 'ServerSessionPool'\n    --- property 'topology' closes the circle",
    "stack": "TypeError: Converting circular structure to JSON\n    --> starting at object with constructor 'NativeTopology'\n    |     property 's' -> object with constructor 'Object'\n    |     property 'sessionPool' -> object with constructor 'ServerSessionPool'\n    --- property 'topology' closes the circle\n    at JSON.stringify (<anonymous>)\n    at stringify (D:\\Node-Jonas\\Node-Rest-Api\\node_modules\\express\\lib\\response.js:1119:12)\n    at ServerResponse.json (D:\\Node-Jonas\\Node-Rest-Api\\node_modules\\express\\lib\\response.js:260:14)\n    at D:\\Node-Jonas\\Node-Rest-Api\\controllers\\tourControllers.js:190:19\n    at D:\\Node-Jonas\\Node-Rest-Api\\utilis\\catchAsync.js:3:5\n    at Layer.handle [as handle_request] (D:\\Node-Jonas\\Node-Rest-Api\\node_modules\\express\\lib\\router\\layer.js:95:5)\n    at next (D:\\Node-Jonas\\Node-Rest-Api\\node_modules\\express\\lib\\router\\route.js:137:13)\n    at Route.dispatch (D:\\Node-Jonas\\Node-Rest-Api\\node_modules\\express\\lib\\router\\route.js:112:3)\n    at Layer.handle [as handle_request] (D:\\Node-Jonas\\Node-Rest-Api\\node_modules\\express\\lib\\router\\layer.js:95:5)\n    at D:\\Node-Jonas\\Node-Rest-Api\\node_modules\\express\\lib\\router\\index.js:281:22\n    at param (D:\\Node-Jonas\\Node-Rest-Api\\node_modules\\express\\lib\\router\\index.js:354:14)\n    at param (D:\\Node-Jonas\\Node-Rest-Api\\node_modules\\express\\lib\\router\\index.js:365:14)\n    at param (D:\\Node-Jonas\\Node-Rest-Api\\node_modules\\express\\lib\\router\\index.js:365:14)\n    at param (D:\\Node-Jonas\\Node-Rest-Api\\node_modules\\express\\lib\\router\\index.js:365:14)\n    at Function.process_params (D:\\Node-Jonas\\Node-Rest-Api\\node_modules\\express\\lib\\router\\index.js:410:3)\n    at next (D:\\Node-Jonas\\Node-Rest-Api\\node_modules\\express\\lib\\router\\index.js:275:10)"
}

我该如何解决这个问题？谢谢

Answer 1

我遇到了这个确切的错误。当您使用 async/await 时，您需要将“await”添加到对 Tours 模型的调用中。您还需要根据 @Anatoly 的观点包含要查询的字段名称：

const tours = await Tour.find({
    yourfieldname: {
        $geoWithin: { $centerSphere: [[lng, lat], radius] }
    }
});