create-n4-app/dist/template/mongodb/database/db.js

Create Next.js app with the n4 stack

import mongoose from "mongoose";
const MONGODB_URL = process.env.MONGODB_URL;
let cached = global.mongoose;
if (!cached) {
    cached = global.mongoose = {
        conn: null,
        promise: null,
    };
}
export const connectToDatabase = async () => {
    if (cached.conn)
        return cached.conn;
    if (!MONGODB_URL)
        throw new Error("Missing MONGODB_URL");
    cached.promise =
        cached.promise ||
            mongoose.connect(MONGODB_URL, {
                dbName: "",
                bufferCommands: false,
            });
    cached.conn = await cached.promise;
    return cached.conn;
};