gridfs-stream和mongoose >= 4.11.0连接设置

Question

我一直在旧版本(<4.11.0)的mongoose上使用gridfs-stream，设置如下：

    var grid = require("gridfs-stream");
    var mongoose = require("mongoose");
    mongoose.connect(connectionString);
    grid.mongo = mongoose.mongo;
    var gfs = grid(mongoose.connection.db);

所有这些设置都可以正常工作。更新到mongoose 4.11.11后，mongoose连接设置应更改为(第3行)：

    mongoose.connect(connectionString, {useMongoClient: true});

但是，现在不再定义mongoose.connection.db。应该如何更改上面的代码才能使其再次工作？非常感谢。

Answer 1

我找到了一个解决方案，它利用了deasync，并且对我现有的所有代码进行了最小程度的更改。然而，它看起来并不理想，因此任何建议都将非常感谢：

    var grid = require("gridfs-stream");
    var mongoose = require("mongoose");
    var deasync = require("deasync");

    //Connect to mongodb
    mongoose.Promise = global.Promise;
    mongoose.connect(connectionString, {useMongoClient: true});

    //Get the connection setting
    var getConnDb = function () {
        var connDb;
        mongoose.connection.then(function (conn) {
            connDb = conn.db;
        });
        while (connDb === undefined) {
            deasync.runLoopOnce();
        }
        return connDb;
    };

    //Set gridfs-stream connection
    grid.mongo = db.mongo;
    var gfs = grid(getConnDb());