There are 3 places to store items data in the quote:

  • \Magento\Quote\Model\Quote::$_items
  • \Magento\Quote\Model\Quote::$_data['items']
  • \Magento\Quote\Model\Quote::$_data['items_collection']


const KEY_ITEMS = 'items';
 * Quote items collection
 * @var \Magento\Eav\Model\Entity\Collection\AbstractCollection
protected $_items;

public function getItems()
    return $this->_getData(self::KEY_ITEMS);

public function setItems(array $items = null)
    return $this->setData(self::KEY_ITEMS, $items);

public function getItemsCollection($useCache = true)
    if ($this->hasItemsCollection()) {
        return $this->getData('items_collection');
    if (null === $this->_items) {
        $this->_items = $this->_quoteItemCollectionFactory->create();
    return $this->_items;

What is the right place to store items data in the quote?

Magento version: 2.1.2


You should probably just use the setItems(array $items) method that you mention above.

You can however run setData('items', $items) but that will assign the same items field as setItems(array $items).

In the same way: getData('items') will return the same thing as getItems();

$_data['items'] probably points to $_items;

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