How to get mongodb version from mongoose

When working with Mongoose and MongoDB, we typically do not directly manage the database's version information. However, if you need to retrieve the MongoDB version, you can achieve this using MongoDB's native commands.

First, ensure that your application has successfully connected to the MongoDB database. Here are the steps to retrieve the MongoDB version using Mongoose:

1. Establish Connection: Verify that your application is connected to MongoDB via Mongoose.

2. Execute Command: Use the Mongoose connection object to execute the native adminCommand method to fetch the database status, which includes version details.

Below is a specific code example:

javascript
const mongoose = require('mongoose');

// Connect to MongoDB
mongoose.connect('mongodb://localhost:27017/yourDatabase', {
  useNewUrlParser: true,
  useUnifiedTopology: true,
});

const db = mongoose.connection;

db.on('error', console.error.bind(console, 'Connection error:'));
db.once('open', function() {
  console.log('Connected successfully');

  // Query server status using adminCommand
  db.db.admin().command({ buildInfo: 1 }, (err, info) => {
    if (err) {
      console.error('Failed to retrieve MongoDB version', err);
    } else {
      console.log('MongoDB version:', info.version);
    }
  });
});

In the above code, we first establish a connection to MongoDB. Once connected, we invoke db.db.admin().command({ buildInfo: 1 }) to retrieve buildInfo, which provides the MongoDB server's build details, including the version number.

This approach effectively enables you to obtain the MongoDB version when using Mongoose, which is highly beneficial for ensuring application compatibility and resolving debugging issues.