title: Meteor.js findOne() cannot find by _id
body: <p>I am trying to find a document in my collection using .findOne(), and searching by _id.</p>
  
  <pre><code>pinnedForumTopics.findOne({_id : 0})
  </code></pre>
  
  <p>(I know that I have a document in my collection with that id)  but this still doesn't return anything.  Anybody know whats up?  (I can search by other things, just not _id...)</p>
  
  <p>here is where I define my collection:</p>
  
  <pre><code>pinnedForumTopics = new Mongo.Collection("pinnedForumTopics");
  </code></pre>
  
  <p>Any help would be greatly appreciated!  Thanks!</p>
  
  <p><strong>EDIT</strong>
  I am using autopublish***</p>