analogueorm / analogue

     * @param  \ArrayAccess|array $items

     * @return self

     */

    public function diff($items)

    {

        $diff = new static;

        $dictionary = $this->getDictionary($items);

        foreach ($this->items as $item) {

            if (!isset($dictionary[$this->getEntityKey($item)])) {

                $diff->add($item);

            }

        }

        return $diff;

    }

    /**

     * Intersect the collection with the given items.

     * @throws MappingException

     * @return self

     */

    public function intersect($items)

    {

        $intersect = new static;

        $dictionary = $this->getDictionary($items);

        foreach ($this->items as $item) {

            if (isset($dictionary[$this->getEntityKey($item)])) {

                $intersect->add($item);

            }

        }

        return $intersect;

    }

    /**

     * Returns only the models from the collection with the specified keys.