Node.js 从MongoDB中的集合获取文档时出错

我正在开发一个应用程序，我必须通过sportsname进行过滤。我是 在后端使用Node.js和MongoDB

这是我的密码：-

这是文件。我想按sportsname搜索用户

当我在那个时间运行时，它给出了一个错误。错误如下所示：-

TypeError: path must be a string at Query.where 
(/node/node-api-master/node_modules/mongoose/lib/query.js:593:11) 
at Object.handle (/node/node-api-master/server.js:202:19) at next_layer 
(/node/node-api-master/node_modules/express/lib/router/route.js:103:13) 
at Route.dispatch (/node/node-api-master/node_modules/express/lib/router/route.js:107:5) 
at /node/node-api-master/node_modules/express/lib/router/index.js:195:24 
at param (/node/node-api-master/node_modules/express/lib/router/index.js:268:14) 
at param (/node/node-api-master/node_modules/express/lib/router/index.js:280:16) 
at param (/node/node-api-master/node_modules/express/lib/router/index.js:280:16) 
at Function.proto.process_params 
(/node/node-api-master/node_modules/express/lib/router/index.js:296:3) 
at next (/node/node-api-master/node_modules/express/lib/router/index.js:189:19)

---

这是一个语法问题，下面是您尝试执行的正确实现：

router.get('/user/:_id/explore/:sportsname', function(req, res, next) {
  return Host.find({ sportsname: req.params.sportsname }, function(err, users) {
    if (err) return next(err);
    console.log(users);
    return res.json(users);
  });
});

---

请注意，检查req.params.sportsname是否存在是不必要的，因为如果不存在，您的路线将永远无法到达。如果要使此参数成为可选参数，请使用以下命令：/user/：\u id/explore/：sportsname？在参数后添加问号。

能否编辑问题以显示主机架构定义？我认为这是因为代码中存在语法问题，请查看并检查警告

TypeError: path must be a string at Query.where 
(/node/node-api-master/node_modules/mongoose/lib/query.js:593:11) 
at Object.handle (/node/node-api-master/server.js:202:19) at next_layer 
(/node/node-api-master/node_modules/express/lib/router/route.js:103:13) 
at Route.dispatch (/node/node-api-master/node_modules/express/lib/router/route.js:107:5) 
at /node/node-api-master/node_modules/express/lib/router/index.js:195:24 
at param (/node/node-api-master/node_modules/express/lib/router/index.js:268:14) 
at param (/node/node-api-master/node_modules/express/lib/router/index.js:280:16) 
at param (/node/node-api-master/node_modules/express/lib/router/index.js:280:16) 
at Function.proto.process_params 
(/node/node-api-master/node_modules/express/lib/router/index.js:296:3) 
at next (/node/node-api-master/node_modules/express/lib/router/index.js:189:19)

router.get('/user/:_id/explore/:sportsname', function(req, res, next) {
  return Host.find({ sportsname: req.params.sportsname }, function(err, users) {
    if (err) return next(err);
    console.log(users);
    return res.json(users);
  });
});