[TYPO3-mvc] lazy loading __toString linkViewHelper

[Marco Huber]

Hi List,

I have a little Problem with the linkViewHelper and lazy loading.

I have an object Project which has the property Customer:

class Tx_MaritReferences_Domain_Model_Project extends 
Tx_Extbase_DomainObject_AbstractEntity {
	/**
	 * customer
	 * @var Tx_MaritReferences_Domain_Model_Customer
	 * @lazy	
	 */
	protected $customer;
}

I used the parameter @lazy because I don't need the customer in every view.
In the Project detailview I use the link ViewHelper:
<f:link.action controller="Customer" action="show" arguments="{customer: 
project.customer}" 
class="projectcustomer">{project.customer.title}</f:link.action>

Now I get this error:
Fatal error: Call to undefined method 
Tx_MaritReferences_Domain_Model_Customer::__toString() in 
/srv/www/htdocs/afrika/Kunden/Develop/mhu/maritag/webroot/typo3/sysext/extbase/Classes/Persistence/LazyLoadingProxy.php 
  on line 157

When I use
<f:link.action controller="Customer" action="show" arguments="{customer: 
project.customer.uid}" 
class="projectcustomer">{project.customer.title}</f:link.action>
there is no error.

Without the @lazy everything works fine.

I think this issue has something to do with Bug #7558 but I have 
absolutly no idea where to start the debugging. When I comment out the 
method __toString in 
typo3\sysext\extbase\classes\persistence\LazyLoadingProxy.php everything 
works fine.

Do I have to write the __toString method in every model because of that? 
I think Fluid should do this for me. Or the LazyLoading mechanism. What 
do you think?

Kind regards,
Marco