Add multiprice recipe

v2/recipes/index.md

@@ -11,4 +11,6 @@ These recipes are all designed to work off of each other, so try it out - you ca
 
 [Products](products.md) - Products and types.
 
-[Orders](orders.md) - Orders, order items, and their types.
+[Multiprice](multiprice.md) - Multiprice and multicurrency.
+
+[Orders](orders.md) - Orders, order items, and their types.

v2/recipes/multiprice.md

@@ -0,0 +1,138 @@
+# Multiprice and multicurrency
+
+We want to define a specific price and currency for each language. 
+
+We need a new multiple commerce_price field in product variation in place of default price field.
+
+Add following field in a custom module or add your own multiple commerce_price field to product variation.
+
+## Creating field
+```yaml
+# config/install/field.field.commerce_product_variation.default.multiprice.yml
+langcode: en
+status: true
+dependencies:
+  config:
+    - commerce_product.commerce_product_variation_type.default
+    - field.storage.commerce_product_variation.multiprice
+  module:
+    - commerce_price
+id: commerce_product_variation.default.multiprice
+field_name: multiprice
+entity_type: commerce_product_variation
+bundle: default
+label: Multiprice
+description: 'Define differents prices depending of currency'
+required: true
+translatable: false
+default_value: {  }
+default_value_callback: ''
+settings: {  }
+field_type: commerce_price
+```
+
+```yaml
+# config/install/field.storage.commerce_product_variation.multiprice.yml
+langcode: en
+status: true
+dependencies:
+  module:
+    - commerce_price
+    - commerce_product
+id: commerce_product_variation.multiprice
+field_name: multiprice
+entity_type: commerce_product_variation
+type: commerce_price
+settings: {  }
+module: commerce_price
+locked: false
+cardinality: -1
+translatable: true
+indexes: {  }
+persist_with_no_fields: false
+custom_storage: false
+```
+
+* Hide default price field from product variation form display and display mode.
+* Display multiprice field in form display and display mode.
+
+## Creating resolver
+
+### Add resolver to services
+
+```yaml
+services:
+  commerce_multiprice_example.commerce_multicurrency_resolver:
+    class: Drupal\commerce_multiprice_example\Resolvers\CommerceMulticurrencyResolver
+    arguments: ['@request_stack']
+    tags:
+      - { name: commerce_price.price_resolver, priority: 600 }
+```
+
+### Creating resolver
+
+Replace multiprice field name by your own field if needed.
+
+```php
+<?php
+namespace Drupal\commerce_multiprice_example\Resolvers;
+
+use Drupal\commerce\Context;
+use Drupal\commerce\PurchasableEntityInterface;
+use Drupal\commerce_price\Price;
+use Drupal\commerce_price\Resolver\PriceResolverInterface;
+
+/**
+ * Returns a price and currency depending of language.
+ */
+class CommerceMulticurrencyResolver implements PriceResolverInterface {
+
+  /**
+   * The language manager.
+   *
+   * @var \Drupal\Core\Language\LanguageManagerInterface
+   */
+  protected $languageManager;
+
+  /**
+   * Constructs a new CommerceMulticurrencyResolver object.
+   *
+   * @param \Drupal\Core\Language\LanguageManagerInterface $language_manager
+   *   The language manager.
+   */
+  public function __construct(LanguageManagerInterface $language_manager) {
+    $this->languageManager = $language_manager;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function resolve(PurchasableEntityInterface $entity, $quantity, Context $context) {
+    // Define mapping between language and currency.
+    $currency_by_language = ['en' => 'USD', 'fr' => 'EUR', 'ja' => 'JPY'];
+
+    // Get current language.
+    $language = $this->languageManager->getCurrentLanguage()->getId();
+
+    // Get default language.
+    $default_language = $this->languageManager->getDefaultLanguage()->getId();
+
+    // Set default price to null. Default price will be used to return currency
+    // of default language if no currency has been found for current language.
+    $default_price = NULL;
+
+    // Find price for current language depending of its currency.
+    foreach ($entity->get('multiprice') as $price) {
+      if ($price->get('currency_code')->getValue() == $currency_by_language[$language]) {
+        return new Price($price->get('number')->getValue(), $price->get('currency_code')->getValue());
+      }
+      elseif ($price->get('currency_code')->getValue() == $currency_by_language[$default_language]) {
+        $default_price = new Price($price->get('number')->getValue(), $price->get('currency_code')->getValue());
+      }
+    }
+
+    return $default_price;
+  }
+}
+```
+