node.js 试图从猫鼬那里获取收藏列表
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Trying to get a list of collections from mongoose
提问by Austin Davis
I'm trying to return a list of a dbs collections using mongoose. I'm following the directions set out here but http://grokbase.com/t/gg/mongoose-orm/122xxxr7qy/mongoose-get-a-list-of-all-collections. So here is my code
我正在尝试使用猫鼬返回 dbs 集合的列表。我正在遵循此处列出的说明，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;
});
the only problem is that names returns as undefined. So is it even possible to return a list of collections using just vanilla mongoose?
唯一的问题是名称返回未定义。那么是否有可能仅使用 vanilla mongoose 返回集合列表？
采纳答案by Charlie Key
Try running your collection names function after connection.
连接后尝试运行您的集合名称功能。
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;
});
})
回答by Squivo
Just came across this answer and though it may have worked at the time it appears collectionNameshas been removed from the available function names in favour of listCollections
刚刚遇到这个答案，虽然它可能在它出现的时候有效，但collectionNames已从可用的函数名称中删除，以支持listCollections
This other stack overflow post has a working example: https://stackoverflow.com/a/29461274/4127352
另一个堆栈溢出帖子有一个工作示例：https: //stackoverflow.com/a/29461274/4127352
Here is the link to the original docs: http://mongodb.github.io/node-mongodb-native/2.0/meta/changes-from-1.0/
这是原始文档的链接：http: //mongodb.github.io/node-mongodb-native/2.0/meta/changes-from-1.0/
回答by Roger
Here is how I managed to obtain all the names on the connected db.
这是我如何设法获得连接的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);
This solution works good on mongoose 4.4.19.
此解决方案适用于mongoose 4.4.19。
回答by zurfyx
If you are only working with Mongoose Models, that is all you need:
如果您只使用 Mongoose 模型，这就是您所需要的：
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({});
});
