title: Get a slice of json string from mongo using golang
body: <p>I am trying to get a slice of json text from mongo using the below code in golang </p>
  
  <pre><code>var a []string
  err := col..Find(nil).Select(bson.M{"_id": 0}).All(&amp;a)
  </code></pre>
  
  <p>I get the error <code>Unsupported document type for unmarshalling: string</code></p>
  
  <p><strong>May I know the right way to do this?</strong></p>