[TYPO3-mvc] Howto call a ViewHelper like f:link.action in my own view helper class?

[Franz Koch]

Hey,

> so the subject says it all :-)

and a little search on the list would have given you the answer for 
that. This question has been asked and answered just 3 days ago - but 
the answer is most likely not what you wanted to hear ;)

> Now if I show the customer list, I want to show the list of services
> that where addressed by the projects done for that customer.
...
> I thought of another way to get the information: storing all services
> that were provided for that customer in a services field of the
> customer object and then use the f:for view helper instead of a self
> written one. But I can't figure out how to tell extbase to read that
> information from the DB. (For the viewhelper I had to use a
> $query->statement()).

That depends. It it is possible for you to create a DB relation between 
services and customers extbase would fetch and store the services in 
your services property of the customer. If that's not possible or not 
intended, I see two solutions:

a) call the repository inside the properties getter

b) use your existing viewHelper to resolve the services, assign those 
services to the templateVariableContainer (just like you would assign a 
new variable to the view from within your controller) and then render 
the viewHelpers children, which allows you to process the services 
however you like.

Example for b):

--- in your viewHelper ---------------
/**
  * proper annotations
  */
public function render(Tx_YourExt_Domain_Model_Customer $customer, $as) {
   // fetch the services - however you currently do it is fine
   $services = 
$this->serviceRepository->findByProjects($customer->getProjects());

   // add the services as variable to your templates
   $this->templateVariableContainer->add($as, $services);
   // render child tags
   $output = $this->renderChildren();
   // cleanup (this in mandatory)
   $this->templateVariableContainer->remove($as);
}

return $output;


--- in your template ------------------
<foo:yourViewHelper customer="{customer}" as="services">
	<f:for each="{services}" as="service">
		<f:link.action .....>
	</f:for>
</foo>
---------------------------------------


For further details, just have a look at the "groupedFor" viewHelper of 
Fluid, or the "alias" viewHelper which are basically doing what you need.
-- 
kind regards,
Franz Koch