title: MongoDB find() which is retrieving only one property from the collection
body: <p>I have a collection of blog posts where the structure of the records is {title, author, contents} and I want to retrieve all the names of all the authors I am doing this:</p>
  
  <pre><code>this.db.collection("ContentText").find("authors");
  </code></pre>
  
  <p>but my output is <code>undefined</code>
  Can someone point out the error?</p>