.. rst-class:: plus-doc

Loyalty Rule
==============

Adding new Loyalty Rule Configuration to API
--------------------------------------------

After creating a new loyalty rule configuration you need to add a new ``LoyaltyRuleActionDataTransformer`` that implements ``Sylius\Plus\Loyalty\Infrastructure\DataTransformer\LoyaltyRuleActionDataTransformerInterface``
To be more flexible, new ``LoyaltyRuleConfiguration`` is created by new DTO object: ``Sylius\Plus\Loyalty\Application\DTO\LoyaltyRuleAction`` that has ``configuration`` field as an ``array``
That field allows you to add any configuration and in the aftermath, you have to transform this object to ``Sylius\Plus\Loyalty\Domain\Model\LoyaltyRuleConfiguration\LoyaltyRuleConfigurationInterface`` instance by your custom  ``LoyaltyRuleActionDataTransformer``
Exemplary ``LoyaltyRuleActionYourCustomConfigurationDataTransformer`` for new `your_custom_configuration` configuration type:

.. code-block:: php

    use Sylius\Plus\Loyalty\Application\DTO\LoyaltyRuleActionInterface as LoyaltyRuleActionInterfaceDTO;
    use Sylius\Plus\Loyalty\Domain\Model\LoyaltyRuleActionInterface as LoyaltyRuleActionInterfaceModel;

    final class LoyaltyRuleActionYourCustomConfigurationDataTransformer implements LoyaltyRuleActionDataTransformerInterface
    {
        /** @var LoyaltyRuleActionFactoryInterface */
        private $loyaltyRuleActionFactory;

        public function __construct(LoyaltyRuleActionFactoryInterface $loyaltyRuleActionFactory)
        {
            $this->loyaltyRuleActionFactory = $loyaltyRuleActionFactory;
        }

        public function transform(LoyaltyRuleActionInterfaceDTO $object, string $to, array $context = []): LoyaltyRuleActionInterfaceModel
        {
            //$object is an input LoyaltyRuleActionInterfaceDTO instance that allow you get new changes and create/update a LoyaltyRuleActionInterfaceModel object

            if (isset($context['object_to_populate'])) {
                /** @var LoyaltyRuleActionInterfaceModel $loyaltyRuleAction */
                $loyaltyRuleAction = $context['object_to_populate'];

                //update object while using PUT or PATCH method

                return $loyaltyRuleAction;
            }

            //create new LoyaltyRuleActionInterfaceModel object while using POST method

            return $this
                ->loyaltyRuleActionFactory
                ->createNewWithDataAndConfiguration('your_custom_configuration', $configuration)
            ;
        }

        public function supportsTransformation(string $actionType): bool
        {
            return $actionType === 'your_custom_configuration';
        }
    }

Next you must register ``LoyaltyRuleActionYourCustomConfigurationDataTransformer`` as a service with tag ``sylius_plus.api.loyalty_rule_action_data_transformer`` and key that is same as given configuration type:

.. code-block:: xml

    <service id="...\LoyaltyRuleActionYourCustomConfigurationDataTransformer" public="true">
        <argument type="service" id="Sylius\Plus\Loyalty\Application\Factory\LoyaltyRuleActionFactory" />
        <tag name="sylius_plus.api.loyalty_rule_action_data_transformer" key="your_custom_configuration" />
    </service>

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   :align: center
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