title: MongoDb db.Collection.update() deleted my document
body: <p>I run an <code>update</code> statement on a <code>mongodb</code> database and it deleted my document! What did I do wrong? </p>
  
  <p>This is the update statement: </p>
  
  <pre><code>db.Question.update( {Name: "IsSomeCompany"}, {ButtonValues: [0, 1, 2] } )
  </code></pre>
  
  <p>I am using <code>Robomongo</code> and the reply was <code>Updated 1 record(s) in 22ms</code> but when I checked the database the record was gone. What am I missing here? </p>