posting and commenting

mongoDB.js

@@ -1,5 +1,6 @@
 const mongo = require('mongodb');
 const MongoClient = mongo.MongoClient;
+const ObjectID = mongo.ObjectID;
 const DBName = "EMI_SOCIAL";
 const mongoUrl = process.env.MONGO_URL;
 const postDB = require("./dbTools/post.js");
@@ -11,6 +12,7 @@ const getDB = new Promise((resolve, reject) => {
         if (err) return reject(err);
     
         DB.db = db;
+        DB.ObjectID = ObjectID;
         console.log("Connected to DB!");
         DB.usersCol = db.db(DBName).collection("users");
         DB.tokensCol = db.db(DBName).collection("tokens");