title: Mongo: find by ObjectId is not defined in meteor?
body: <p>I am using existing Mongodb in meteor project. The existing mongo id represented by <code>ObjectId()</code>. When I try to find by <code>_id</code>, Meteor says <code>ObjectId is not defined</code></p>
  
  <p><strong>JS</strong>:</p>
  
  <pre><code>Names = new Mongo.Collection('name_list', {idGeneration: 'MONGO'});
  Names.find({"_id" : ObjectId("5539d9dcf046be5b2302aefc")}) //ReferenceError: ObjectId is not defined
  </code></pre>
  
  <p>The above JavaScript code is run in server.</p>