How to Work with Multiple Databases Using Mongoose in Node.js Projects?

Multiple Databases with Mongoose in Node.js Projects

Harnessing the power of Mongoose for database management can present a dilemma when dealing with multiple databases within a single Node.js project. This issue arises from two limitations:

• Mongoose Restrictions: Mongoose models are tethered to one database connection, prohibiting multiple database utilization within a single instance.
• Node.js Caching: The Node.js module caching system can hinder the creation of multiple Mongoose instances for different databases.

Resolving the Dilemma

Fortunately, the Mongoose documentation offers a solution in the form of createConnection(), which empowers developers to connect to multiple databases. However, this approach necessitates the creation of distinct models for each connection or database:

var conn = mongoose.createConnection('mongodb://localhost/testA');
var conn2 = mongoose.createConnection('mongodb://localhost/testB');

// stored in 'testA' database
var ModelA = conn.model('Model', new mongoose.Schema({
  title: { type: String, default: 'model in testA database' },
}));

// stored in 'testB' database
var ModelB = conn2.model('Model', new mongoose.Schema({
  title: { type: String, default: 'model in testB database' },
}));

This solution grants the flexibility to establish connections to separate databases and define custom models associated with each connection. By adopting this approach, you can effectively manage multiple databases within a single project, harnessing the capabilities of Mongoose for efficient data management.

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