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How to set price field value programmatically in Drupal Commerce

Components

Price in Drupal Commerce 2.x is not a number but a class. This class has a price number and currency code properties, and both are strings. So, to set the product price programmatically you have to first instantiate the Price class:

$price = new \Drupal\commerce_price\Price('9.99', 'EUR');

and then use created Price object to set the product price:

$product_variation = \Drupal\commerce_product\Entity\ProductVariation::load(1);
$product_variation->set('price', $price);
$product_variation->save();

To get the price number and currency code you can use appropriate getters methods:

$price_number = $price->getNumber();
$currency_code = $price->getCurrencyCode();

You can also create a Price object by using the static method:

$price = Price::fromArray(['number' => '9.99', 'currency_code' => 'EUR']);

How to programmatically add a language

Components

Sometimes you have to add a new language in Drupal 8/9 programmatically. For example, maybe you need to write an update hook that will add a new language. This is how you can do it:

use Drupal\language\Entity\ConfigurableLanguage;

$language = ConfigurableLanguage::createFromLangcode('sr');
$language->save();

If you don't know the langcode, you can find it by inspecting the select box on the /admin/config/regional/language/add page. 

How to programmatically change order status

Components

Changing the order state in Drupal Commerce 2.x like this:

$order->set('state', 'canceled');
$order->save();

is not a good idea because you are not dispatching transition events. And some modules depend on those events. The proper way to change the order state is to apply state transition like this:

$order = \Drupal::entityTypeManager()
  ->getStorage('commerce_order')
  ->load(1);
$order->getState()->applyTransitionById('cancel');
$order->save();

You can find the list of transition IDs in the workflows file.

How to get all field names of field type

Components

To get a list of all field names for the fields whose field type is for example image you can use the entity_field.manager service:

$field_map = \Drupal::service('entity_field.manager')->getFieldMapByFieldType('image');

The field_map array will contain a list of fields by entity type.

Image

How to programmatically render entity form

Components

Programatically rendering entity form in Drupal 8 and 9 is easy, provided that you want to render it using the default form mode.

// Load existing node
$node = \Drupal\node\Entity\Node::load(1);
// or create a new node
$node = \Drupal::entityTypeManager()->getStorage('node')->create(['type' => 'article']);

$form = \Drupal::service('entity.form_builder')->getForm($node);

If you want to render it using any other form mode like this for example:

$node = \Drupal\node\Entity\Node::load(1);
$form = \Drupal::service('entity.form_builder')->getForm($node, 'compact');

you will have to alter the entity definition and add your own form handler. Otherwise, you'll get the following error:

Drupal\Component\Plugin\Exception\InvalidPluginDefinitionException: The "node" entity type did not specify a "compact" form class.

To add your own form class you can use the hook_entity_type_alter hook like this:

/**
 * Implements hook_entity_type_alter().
 *
 * Alters the entity definition and adds our own form handlers.
 */
function MY_MODULE_entity_type_alter(array &$entity_types) {
  $form_modes = \Drupal::service('entity_display.repository')
    ->getAllFormModes();

  foreach ($form_modes as $entity_type => $display_modes) {
    if ($entity_type !== 'node') {
      continue;
    }

    $type = $entity_types[$entity_type];
    foreach ($display_modes as $machine_name => $form_display) {
      if (isset($type->getHandlerClasses()['form']['default'])) {
        $default_handler_class = $type->getHandlerClasses()['form']['default'];
        $type->setFormClass($machine_name, $default_handler_class);
      }
    }
  }
}