Magento 2 get all product attributes without product id

Question

I want to retrieve all product attributes those are available, then convert it to name & value for my select options field. In Magento 1 I can achieve it like this:

public function getMagentoAttributes()
{
    $values[] = array(
        'value' => '',
        'label' => 'Pick Product Attribute'
    );

    $categories = Mage::getResourceModel('catalog/product_attribute_collection')->getItems();

    foreach ($categories as $category) {
        if ($category->getFrontendLabel() != '') {
            $label = $category->getFrontendLabel();
        } else {
            $label = $category->getAttributecode();
        }

        $values[] = array(
            'value' => $category->getAttributecode(),
            'label' => $label
        );
    }
    return $values;
}

Is there a way in magento 2 to do the same thing?

Answer 1

protected $_attributeFactory;

 public function __construct(
    ....
    \Magento\Catalog\Model\ResourceModel\Eav\Attribute $attributeFactory,
    ....
) {
    ....
    $this->_attributeFactory = $attributeFactory;
    ....
}

public function <func_name>()
{
    $attributeInfo = $this->_attributeFactory->getCollection();

   foreach($attributeInfo as $attributes)
   {
        $attributeId = $attributes->getAttributeId();
        // You can get all fields of attribute here
   }
}

Here you can have whole collection of attributes, you can filter it as per your need.

Answer 2

Another idea is that we should try with Service Contracts Layer.

Use Magento\Eav\Api\AttributeRepositoryInterface to get the eav attribute.

I have an answer already here: https://magento.stackexchange.com/a/161426/33057

For example:

    $searchCriteria = $this->searchCriteriaBuilder->create();
    $attributeRepository = $this->attributeRepository->getList(
        'catalog_product',
        $searchCriteria
    );

    foreach ($attributeRepository->getItems() as $items) {
        $items->getAttributeCode();
        $items->getFrontendLabel();
    }

NOTE: For the entity type code in getList method, we can find in the eav_entity_type table.