试图从mongoose获取集合列表

Question

我正在尝试使用mongoose返回dbs集合的列表。我按照这里列出的指示，但http://grokbase.com/t/gg/mongoose-orm/122xxxr7qy/mongoose-get-a-list-of-all-collections。所以这是我的代码

var mongoose = require('mongoose');
    //if (mongoose.connection.readyState == 0){//checks if already connected to the database
    console.log("creating connection to the database");
    var Config = require('../configs/config');
    var config = new Config();
    config = config.getConfig().db.dev;

    if (mongoose.connection.readyState = 0 ) {
    mongoose.connect("mongodb://austin:[email protected]:10023/test1");
    console.log('mongoose readyState is ' + mongoose.connection.readyState);
    }
    var collection;

    mongoose.connection.on('open', function (ref) {
        console.log('Connected to mongo server.');
    });

    //trying to get collection names
    mongoose.connection.db.collectionNames(function (err, names) {
        console.log(names); // [{ name: 'dbname.myCollection' }]
        module.exports.Collection = names;
    });

唯一的问题是名称返回未定义。那么甚至可以使用香草猫鼬返回集合列表吗？

Answer 1

连接后尝试运行集合名称功能。

mongoose.connection.on('open', function (ref) {
    console.log('Connected to mongo server.');
    //trying to get collection names
    mongoose.connection.db.listCollections().toArray(function (err, names) {
        console.log(names); // [{ name: 'dbname.myCollection' }]
        module.exports.Collection = names;
    });
})

Answer 2

刚刚遇到这个答案，虽然它可能已经工作，当时它出现collectionNames已从可用的函数名称中删除，有利于listCollections

这个其他堆栈溢出帖子有一个工作示例：https://stackoverflow.com/a/29461274/4127352

这是原始文档的链接：http://mongodb.github.io/node-mongodb-native/2.0/meta/changes-from-1.0/

Answer 3

以下是我如何设法获取连接数据库上的所有名称。

var mongoose = require('mongoose');
var collections = mongoose.connections[0].collections;
var names = [];

Object.keys(collections).forEach(function(k) {
    names.push(k);
});

console.log(names);

这个解决方案适用于猫鼬4.4.19。

Answer 4

如果您只使用Mongoose Models，那就是您所需要的：

const connection = mongoose.connection;
Object.keys(connection.models).forEach((collection) => {
  // You can get the string name.
  console.info(collection);
  // Or you can do something else with the model.
  connection.models[collection].remove({});
});