[TYPO3-mvc] MM-relations? non-persistant Repository?

[Christian Zenker]

Hi everyone.

I played around with extbase for some days now. It's an interesting new  
way for extension writing, but sometimes it's also confusing.  
Nevertheless: Great work everyone who spent his/her time.


There is one point where I'm stuck right now:

1) I write an extension with the simple task to display entries from a  
database. What seems to cause problems is an MM-relation in the database.  
Could it be, that extbase isn't supporting this at the moment (got the  
version from TYPO3 4.3-dev some days ago)?
As I'm not *that* experienced in TYPO3 (yet), it might also be my fault.  
If it helps I could post some parts of the TCA.

The error I get is

   NO entry in the $TCA-array for the table "". This means that the  
function enableFields() is called with an invalid table name as argument.

Backtracing the error revealt, that  
Tx_Extbase_Persistence_Mapper_ObjectRelationalMapper::fetch() caused the  
error when calling  
$GLOBALS['TSFE']->sys_page->enableFields($dataMap->getTableName()) because  
the $className is empty. (the TODO underneath made me suppose that it  
might not be my fault :) ) The database field processed by then was

Tx_Extbase_Persistence_Mapper_ColumnMap Object
(
     [propertyName:protected] => category
     [columnName:protected] => category
     [typeOfRelation:protected] => 3
     [typeOfValue:protected] => 1
     [childClassName:protected] =>
     [childTableName:protected] => tx_fiproductdisplay_domain_model_category
     [childTableWhere:protected] =>
     [childSortByFieldName:protected] =>
     [relationTableName:protected] =>  
tx_fiproductdisplay_product_category_mm
     [parentKeyFieldName:protected] =>
     [parentTableFieldName:protected] =>
)

Is there any way to get around this by now?



2) The second question is less of a problem, but a theoretical question.
I created a ProductRepository class in my extension (as far as I  
understand, this is what handles the db-queries). Like blog_example this  
class extends Tx_Extbase_Persistence_Repository. If I got it right, this  
class also checks for changes of the returned objects. But I don't need  
this functionality, because changes are only made from the backend. So I  
think it's an overkill to my task. Is there any other base class I could  
extend for this more simple purpose?


Thanks for your help.

Christian.