[TYPO3-mvc] Data Flow problems from Fluid to Domain Model Class

[Frank Mey]

Hi,
I got the following situation:
I injected a PHPExcel-object into my Domain-Model-Class and now want to
pass the user some functionality in the frontend. Ofc I used FLUID for it,
so I had my model class  instanciated into the right controller and i.e. 
did a
<f:link.action> - Link where the user can start a statistics evaluation 
process with a
download link to a PHPExcel-generated Excel file being created after the 
user has hit
the start-link. So far so good :)...

Now I want to let the user decide in a dropdown-selection for which time 
he wants the
statistics data being generated. Thus I used the <f:form> and 
<f:form.select> ViewHelpers to
get values for a property of the Domain Model Class. As I am relatively 
new to the MVC object,
I don't know how to handle the submitted form data in the corresponding 
controller action.

I studied the blog example project, but I dont have the situation where 
I have database objects and stuff.
I only have an in-memory PHPExcel-Object I pass data to. How would this 
be achieved then ?

My current controller-class looks something like this :

class Tx_StatisticsInterface_Controller_ExcelSheetController extends 
Tx_Extbase_MVC_Controller_ActionController {

   protected $dataSheet;

     public function initializeAction()  {
         $this->dataSheet = 
t3lib_div::makeInstance('Tx_StatisticsInterface_Domain_Model_ExcelSheet');
     }

     /**
      * create action
      * @param Tx_StatisticsInterface_Domain_Model_ExcelSheet $dataSheet
      * @dontvalidate $dataSheet
      */
     public function createAction() {
        $this->dataSheet->getSheetData();
       // $this->dataSheet->setZeitraum(<POST value of the selection box>);
        $this->view->assign('datasheet',$this->dataSheet);
     }

I know, the instanciating of the Model class isnt that correct, but I 
always get an error when I try to instanciate the class in the createAction
saying invalid property type PHPExcel. I think it's because of the 
Tx_StatisticsInterface_Domain_Model_ExcelSheet instanciating the 
PHPExcel object in its constructor...

I would really apprecheate any tipps & comments as I would like to 
support the MVC/extbase approach for TYPO3 in the future.

Mit freundlichen Gruessen
Best regards

-- 
Frank Mey
B.Eng. Medienproduktion und -technik
(new media)