repository.js

var mongoose = require("mongoose"),
    connection = mongoose.connection,
    gracefulExit = function() {
        connection.close(function() {
            console.log('Mongoose default connection disconnected through app termination');
            process.exit(0);
        });
    };

mongoose.connect(process.env.MONGO_URI);

connection.on('error', function(err) {
    console.error('DB connection error', err);
}).once('open', function() {
    console.log('DB open');
});

process.on('SIGINT', gracefulExit)
       .on('SIGTERM', gracefulExit);

module.exports = function(name, dataStructure) {
    var schema = new Schema(dataStructure);
    return mongoose.model(name, schema);
};