sending emails when new post to profiles

mongoDB.js

@@ -34,6 +34,11 @@ const getDB = new Promise((resolve, reject) => {
             return DB.usersCol.findOne({ username: username });
         }
 
+        DB.getUserById = (userid)=>{
+            const _id = new mongo.ObjectID(userid);
+            return DB.usersCol.findOne({ _id });
+        }
+
         DB.newUser = (userInformation)=>{
             return DB.usersCol.insertOne(userInformation).catch((err)=>{
                 console.log(err);