public function addDealerContent(ChildDealerContent $l)
    {
        if ($this->collDealerContents === null) {
            $this->initDealerContents();
            $this->collDealerContentsPartial = true;
        }

        if (!in_array($l, $this->collDealerContents->getArrayCopy(), true)) { // only add it if the **same** object is not already associated
            $this->doAddDealerContent($l);
        }

        return $this;
    }