title: Meteor collection using underscore pluck on an array object
body: <p>Is it possible to use underscore pluck on an array object not just an property name</p>
  
  <p>This works fine as it's property name and just a string ID value. </p>
  
  <pre><code>return Collaborators.find({collaboratorId: {$in: _.pluck(topics, '_id')}});
  </code></pre>
  
  <p>But what if I need to use an array like so </p>
  
  <pre><code>Meteor.users.find({_id: {$in: _.pluck(topics, 'collaboratorsIds')}});
  </code></pre>
  
  <p>Were collaboratorsIds is </p>
  
  <pre><code> [ 'btcTd637xvDrgTieJ', 'DLqCAnw7CSakRTy6S', 'btcTd637xvDrgTieJ' ]  
  </code></pre>