一尘不染

'process.nextTick(function(){throw err;})'-未定义不是函数(mongodb / mongoose)

node.js

我正在尝试使用nodejs和socket.io 连接到我的 mongodb 。我能够连接到数据库,因为一旦我-确实-
获得了我在控制台中但在Node.js端上的“连接接受”

通过猫鼬建立与mongodb:// localhost:27017的连接

接下来它立即失败

process.nextTick(function(){throw err;})^
TypeError:undefined不是showCollections中的函数**

这里是showCollections:

var showCollections = function(db, callback) { 
    mongoose.connection.db.collectionNames(function(error, names) {
    if (error) {
      throw new Error(error);
    } else {
        console.log("=>Listening mongo collections:");
      names.map(function(cname) {
        mongoose.connection.db.dropCollection(cname.name);
        console.log("--»"+cname.name);
      });
    }
  });

}

这是我的数据库文件夹的内容:

_tmp (empty folder)
local.0
local.ns
mongod.lock

我通过键入 mongod –dbpath文件夹 运行mongodb ,它成功地“ 唤醒 了端口27017上的连接”。

另外,我来自 package.json (npm)的node_modules

"dependencies": {
    "express": "^4.9.6",
    "socket.io": "latest",
    "mongodb": "~2.0",
    "mongoose": "*"
  }

非常感谢您的帮助…

堆栈跟踪:

> TypeError: undefined is not a function
>     at showCollections (/usr/share/nginx/www/index.js:77:25)
>     at NativeConnection.callback (/usr/share/nginx/www/index.js:46:3)
>     at NativeConnection.g (events.js:199:16)
>     at NativeConnection.emit (events.js:104:17)
>     at open (/usr/share/nginx/www/node_modules/mongoose/lib/connection.js:485:10)
>     at NativeConnection.Connection.onOpen (/usr/share/nginx/www/node_modules/mongoose/lib/connection.js:494:5)
>     at /usr/share/nginx/www/node_modules/mongoose/lib/connection.js:453:10
>     at /usr/share/nginx/www/node_modules/mongoose/lib/drivers/node-mongodb-native/connection.js:59:5
>     at /usr/share/nginx/www/node_modules/mongoose/node_modules/mongodb/lib/db.js:200:5
>     at connectHandler (/usr/share/nginx/www/node_modules/mongoose/node_modules/mongodb/lib/server.js:272:7)

编辑:

当尝试运行nodejs实例时,我也会遇到这些问题:

{ [Error: Cannot find module '../build/Release/bson'] code: 'MODULE_NOT_FOUND' }
js-bson: Failed to load c++ bson extension, using pure JS version

我尝试修复它们,因为这里的其他问题会告诉我,但是也没有任何效果…


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2020-07-07

共1个答案

一尘不染

根据提供的信息,您似乎正在使用mongodb 2.0驱动程序。db.collectionNames方法已删除。查看此页面的“ Db对象”部分-https:
//github.com/mongodb/node-mongodb-
native/blob/0642f18fd85037522acf2e7560148a8bc5429a8a/docs/content/tutorials/changes-
from-1.0.md#L38

他们已将其替换为listCollections。您应该获得与以下相同的效果:

mongoose.connection.db.listCollections().toArray(function(err, names) {
    if (err) {
        console.log(err);
    }
    else {
        names.forEach(function(e,i,a) {
            mongoose.connection.db.dropCollection(e.name);
            console.log("--->>", e.name);
        });
    }
});
2020-07-07