public function addDealerProduct(ChildDealerProduct $l)
    {
        if ($this->collDealerProducts === null) {
            $this->initDealerProducts();
            $this->collDealerProductsPartial = true;
        }

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

        return $this;
    }