[Flow] fetching constraints from repository method

[Alexander Wende]

In one of my repositories I have some default constraints which should be added with an logical AND to all queries.
My findAll method looks like this:
    /**
     *
     * @return \TYPO3\Flow\Persistence\QueryResultInterface The query result
     */
    public function findAll() {
        $query = $this->createQuery();
        $lastRevisionsConstraint =  $query->equals('nextRevision',NULL);
        $notDeletedConstraint = $query->equals('deleted',"0");
        $result = $query->matching($query->logicalAnd(array($lastRevisionsConstraint,$notDeletedConstraint)))->execute();
        return $result;
    }


This works fine. But I don't want to repeat myself again and again for the other methods. So I moved the default constraints part into a seperate method.
Now I have two functions:

    /**
     * @return object
     */
    protected function getDefaultConstraints(){
        $query = $this->createQuery();
        $lastRevisionsConstraint =  $query->equals('nextRevision',NULL);
        $notDeletedConstraint = $query->equals('deleted',"0");
        return $query->logicalAnd(array($lastRevisionsConstraint,$notDeletedConstraint));
    }
}
    /**
     *
     * @return \TYPO3\Flow\Persistence\QueryResultInterface The query result
     */
    public function findAll() {
        $query = $this->createQuery();
        $result = $query->matching($this->getDefaultConstraints())->execute();
        return $result;
    }

But this doesn't work. I thought it could a problem with the return annotation of the getDefaultConstraints method. So I changed it to \TYPO3\Flow\Persistence\Generic\Qom\LogicalAnd but it didn't work.

In the Exception Log I found the following exceptions:

Uncaught exception in line 255 of /var/www/flow3/Quickstart/Packages/Libraries/doctrine/orm/lib/Doctrine/ORM/Query.php: Invalid parameter number: number of bound variables does not match number of tokens