使用mongoDB和Node.js检测错误循环依赖

在尝试用户使用MongoDB和Node.jslogin时遇到以下错误。

错误：

/opt/lampp/htdocs/FGDP/node_modules/mongodb/lib/mongo_client.js:236 throw err ^ Error: cyclic dependency detected at serializeObject (/opt/lampp/htdocs/FGDP/node_modules/bson/lib/bson/parser/serializer.js:296:33) at serializeInto (/opt/lampp/htdocs/FGDP/node_modules/bson/lib/bson/parser/serializer.js:776:17) at serializeObject (/opt/lampp/htdocs/FGDP/node_modules/bson/lib/bson/parser/serializer.js:308:18) at serializeInto (/opt/lampp/htdocs/FGDP/node_modules/bson/lib/bson/parser/serializer.js:776:17) at serializeObject (/opt/lampp/htdocs/FGDP/node_modules/bson/lib/bson/parser/serializer.js:308:18) at serializeInto (/opt/lampp/htdocs/FGDP/node_modules/bson/lib/bson/parser/serializer.js:776:17) at serializeObject (/opt/lampp/htdocs/FGDP/node_modules/bson/lib/bson/parser/serializer.js:308:18) at serializeInto (/opt/lampp/htdocs/FGDP/node_modules/bson/lib/bson/parser/serializer.js:776:17) at serializeObject (/opt/lampp/htdocs/FGDP/node_modules/bson/lib/bson/parser/serializer.js:308:18) at serializeInto (/opt/lampp/htdocs/FGDP/node_modules/bson/lib/bson/parser/serializer.js:776:17) 

我在下面解释我的代码。

loginController.js：

 var userData={'user_name':$scope.user_name,'user_pass':$scope.user_pass}; $http({ method: 'POST', url: "/login", data: userData, headers: { 'Content-Type': 'application/x-www-form-urlencoded' } }).then(function successCallback(response){ console.log('login',response); if(response.data['user_type']=='1'){ $location.path('dashboard'); } },function errorCallback(response) { console.log(response); }); 

我的服务器端代码如下。

 var mongoJs=require('mongojs'); var CryptoJS = require("crypto-js"); var database='FGDP'; var collections=['f_users']; var db=mongoJs("127.0.0.1:27017/"+database, collections); exports.userlogin=function(req,res){ var username=req.body.user_name; var password=req.body.user_pass; var ciphertext = CryptoJS.AES.encrypt(password, 'lexelPass'); db.f_users.findOne({login_name:username,password:ciphertext},function(err,docs){ if(!err){ if(docs){ req.session.email=docs.email; req.session.name=docs.name; req.session.login_name=docs.login_name; req.session.status=docs.status; req.session.user_type=docs.user_type; res.send(docs); } } if(err){ res.send("Login failed"); } }) } 

在这里，我正在上面的错误服务器端。请帮我解决这个问题。