Connection returned from mongoose.connect has undefined connection.db property in 4.4.7

[mleanos]

We're connecting to our MongoDB instance with mongoose.connect. Up till the release of Mongoose 4.4.7, the returned Connection's connection.db property gave us a dropDatabase method.

After upgrading to 4.4.7, the connection.db property is undefined.

We connect this way:

var db = mongoose.connect(config.db.uri, config.db.options, function (err) {
    // Log Error
    if (err) {
      console.error(chalk.red('Could not connect to MongoDB!'));
      console.log(err);
    } else {

      // Enabling mongoose debug mode if required
      mongoose.set('debug', config.db.debug);

      // Call callback FN
      if (cb) cb(db);
    }
  });

And we have a Grunt task to drop the database:

grunt.task.registerTask('dropdb', 'drop the database', function () {
    // async mode
    var done = this.async();

    // Use mongoose configuration
    var mongoose = require('./config/lib/mongoose.js');

    mongoose.connect(function (db) {
      db.connection.db.dropDatabase(function (err) {
        if (err) {
          console.log(err);
        } else {
          console.log('Successfully dropped db: ', db.connection.db.databaseName);
        }
        db.connection.db.close(done);
      });
    });
  });

I reverted back to Mongoose 4.4.6 and this issue went away.

[mleanos]

Upon further investigation, it appears the connection isn't being made. When I change the above example that connects to the database, to use createConnection instead of connect, I get the following error thrown.

Perhaps, I'm complicating the matter by changing the connection method to use createConnection (for the purposes of debugging) but I find it interesting that no error is thrown when attempting the connection by using connect; but it's not making the connection.

Any ideas?

[simonkontschak]

Same situation, same problem...

[mleanos]

@vkarpov15 My issue went away after upgrading to 4.4.8. Thanks for the prompt fix!