fix: Prevent MongoDB client promise being cached

examples/with-mongodb/lib/mongodb.ts

@@ -13,27 +13,24 @@ const options = {
  },
 };
 
-let client;
-let clientPromise: Promise<MongoClient>;
+let client: MongoClient;
 
 if (process.env.NODE_ENV === "development") {
  // In development mode, use a global variable so that the value
  // is preserved across module reloads caused by HMR (Hot Module Replacement).
  let globalWithMongo = global as typeof globalThis & {
- _mongoClientPromise?: Promise<MongoClient>;
+ _mongoClient?: MongoClient;
  };
 
- if (!globalWithMongo._mongoClientPromise) {
- client = new MongoClient(uri, options);
- globalWithMongo._mongoClientPromise = client.connect();
+ if (!globalWithMongo._mongoClient) {
+ globalWithMongo._mongoClient = new MongoClient(uri, options);
  }
- clientPromise = globalWithMongo._mongoClientPromise;
+ client = globalWithMongo._mongoClient;
 } else {
  // In production mode, it's best to not use a global variable.
  client = new MongoClient(uri, options);
- clientPromise = client.connect();
 }
 
-// Export a module-scoped MongoClient promise. By doing this in a
+// Export a module-scoped MongoClient. By doing this in a
 // separate module, the client can be shared across functions.
-export default clientPromise;
+export default client;

examples/with-mongodb/pages/index.tsx

@@ -1,5 +1,5 @@
 import Head from "next/head";
-import clientPromise from "../lib/mongodb";
+import client from "../lib/mongodb";
 import type { InferGetServerSidePropsType, GetServerSideProps } from "next";
 
 type ConnectionStatus = {
@@ -10,16 +10,7 @@ export const getServerSideProps: GetServerSideProps<
  ConnectionStatus
 > = async () => {
  try {
- await clientPromise;
- // `await clientPromise` will use the default database passed in the MONGODB_URI
- // However you can use another database (e.g. myDatabase) by replacing the `await clientPromise` with the following code:
- //
- // `const client = await clientPromise`
- // `const db = client.db("myDatabase")`
- //
- // Then you can execute queries against your database like so:
- // db.find({}) or any of the MongoDB Node Driver commands
-
+ await client.connect(); // `await client.connect()` will use the default database passed in the MONGODB_URI
  return {
  props: { isConnected: true },
  };