title: Angularjs: Transform data before send with ng-resource and transformRequest
body: <p>I want to change some data before sending it to the server via ng-resource. I use the tranformRequest-Function like this:</p>
  
  <pre><code>    update: {
          method: 'PUT',
          transformRequest: function (data) {
               // modify data then
               return data;
          }
      }
  </code></pre>
  
  <p>I can modify data this way but in the request my data is always serialized. I want keep my data as JSON. Is this possible with transformRequest or have this to be done in controller. I would prefer to do it in the service. Thx for help</p>