findAndModify（）在mongoose中给予exception

我有一个以下代码来更新子集合字段中的文档，我得到exception后面的代码。

router.route('/user/:_id/host/:_id/accept/').post(function(req, res) { Host.findAndModify({ "query" : { "_id" : req.body.eventid, "joinees" : { "$elemMatch" : { "userid" : req.body.userid } } }, "update" : { "$set" : { "joinees.$.status_code" : 1 }, }, "new" : true, "upsert" : false }, function(err, host) { if (err) { console.log(err); res.json(err); } else { console.log("kanishka"); res.json(host); } }); }); 

在控制台中打印的例外情况如下：

 TypeError: undefined is not a function at Object.handle (/node/Playo1/server1.js:332:7) at next_layer (/node/Playo1/node_modules/express/lib/router/route.js:103:13) at Route.dispatch (/node/Playo1/node_modules/express/lib/router/route.js:107:5) at /node/Playo1/node_modules/express/lib/router/index.js:195:24 at param (/node/Playo1/node_modules/express/lib/router/index.js:268:14) at param (/node/Playo1/node_modules/express/lib/router/index.js:280:16) at param (/node/Playo1/node_modules/express/lib/router/index.js:280:16) at Function.proto.process_params (/node/Playo1/node_modules/express/lib/router/index.js:296:3) at next (/node/Playo1/node_modules/express/lib/router/index.js:189:19) at next (/node/Playo1/node_modules/express/lib/router/index.js:166:38) 

Answer 1

试试这个。 这将工作。

 router.route('/user/:_id/host/:_id/accept/') .post(function(req, res) { Host.findOneAndUpdate({ "_id" : req.body.eventid, "joinees" : { "$elemMatch" : { "userid" : req.body.userid } } }, { "$set" : { "joinees.$.status_code" : 1 } }, { "new" : true, "upsert" : false }, function(err, host) { if (err) { console.log(err); res.json(err); } else { res.json({ message : "request Accepted", requestStatus : 1 }); } }); });