title: Insert & save with mongoose collection
body: <p>I am trying to insert new records into my MongoDB using Mongoose.  I have the following coffeescript, iterating over an array of ad_units:</p>
  
  <pre><code>campaign_doc = new mongoose.Collection 'scheduled_campaigns', db
  for unit in ad_units
  campaign = new campaign_model unit
  campaign_doc.insert campaign
  campaign.save()
  </code></pre>
  
  <p>The code runs and no errors are thrown.  However, my collection is not updated.<br>
  Any ideas?</p>
  
  <p>Thanks,
  Igor</p>