title: Backbonejs HTTP body on put request different on second model save
body: <p>My question is related to the second save of a Backbone model and why my HTTP request body is different on the second save. </p>
  
  <p>This is an existing model so a <code>put</code> request is sent to the server on both accounts. </p>
  
  <p>The first time I make a change to the model a put request with the following HTTP body is sent to the server:</p>
  
  <pre><code>{ id: '12345',
    book_title: 'new title' }
  </code></pre>
  
  <p>If I make another change to the model and save again the following HTTP body is sent:</p>
  
  <pre><code>{ id: '12345',
    book_title: 'second title',
    command: 'UPDATE',
    rowCount: 1,
    oid: null,
    rows: [],
    fields: [],
    _parsers: [],
    RowCtor: null,
    rowAsArray: false }
  </code></pre>
  
  <p>Why is the extra data added to the HTTP body on the second save?</p>