How to load all variations and its id by using product_id programmatically using Drupal Commerce-2.x?

Question

How to load the variations_id from product_id on form alter in Drupal commerce-2.x?

Answer 1

You need first to load Product variation entity, You need to get Product variation ids from loaded product and then extract SKU, Price, Currency Code and etc.

$parameter = \Drupal::routeMatch()->getParameter('commerce_product');
$product = \Drupal\commerce_product\Entity\Product::load((int)$parameter->id());

/*Load Product Variations*/
$entity_manager = \Drupal::entityManager();
$product_variation = $entity_manager->getStorage('commerce_product_variation')->load((int)$product->getVariationIds()[0]);
$price_number = $product_variation->get('price')->getValue()[0]['number'];
$price_currency = $product_variation->get('price')->getValue()[0]['currency_code'];