protected function createAndPersistData() { foreach ($this->getReferences('product') as $product) { $productStock = new ProductStock(); $productStock->setProduct($product)->setQuantity(rand(0, 1000)); $warehouse = $this->getReference(sprintf('warehouse_%s', rand(1, 10))); $productStock->setWarehouse($warehouse); $this->manager->persist($productStock); } }