title: Sequelize eager loading with create method
body: <p>When a new post is created I want user details with it. I searched in sequelize docs couldn't find anything helpful. Right now I'm using additional method provided by sequelize on model but it is executing 2 queries.</p>
  <pre><code>let createPost = await db.Post.create({
        content: content,
        postedBy: req.session.user.id,
      });
  
  let user = await createPost.getUser({ attributes: ['id', 'firstName'] });
  </code></pre>
  <p>How can I get postedBy user details back with post details in one query?</p>