title: How can I use .id of existing User with mongoose Model populate?
body: <p>I have saved users</p>
  <pre><code>{ &quot;_id&quot; : ObjectId(&quot;5f970abfe1c19f452cf715eb&quot;), &quot;username&quot; : &quot;Jean1&quot;, &quot;email&quot; : &quot;mtigana@aol.com&quot;, &quot;__v&quot; : 0 }
  { &quot;_id&quot; : ObjectId(&quot;5f97c071bad24d1a81b25dd1&quot;), &quot;username&quot; : &quot;Jim&quot;, &quot;email&quot; : &quot;jimmana@aol.com&quot;, &quot;__v&quot; : 0 }
  </code></pre>
  <p>When I create Post</p>
  <pre><code>async function createPost() {
        await Post.create({title: 'Vou come Karen! ',
          body: 'What a wonderful life!',
          postedBy: 5f97c071bad24d1a81b25dd1,
          comments
        });
  </code></pre>
  <p>This gives error</p>
  <pre><code>        postedBy: 5f97c071bad24d1a81b25dd1,
                    ^
  
  SyntaxError: Invalid or unexpected token
  </code></pre>
  <p>How to releate postedBy field with user Jim?</p>