[BUGFIX] Fix the resource plugin reference

So the cache placeholder population can load the plugin.

Author: Mateu Aguiló Bosch

src/Plugin/formatter/FormatterJsonApi.php

@@ -424,10 +424,11 @@ protected function embedField(ResourceFieldInterface $resource_field, $parent_id
       return NULL;
     }
     $ids = $cardinality == 1 ? $ids = array($ids) : $ids;
+    $resource_info = $resource_field->getResource();
     $empty_value = array(
       '#fields' => array(),
       '#embedded' => TRUE,
-      '#resource_plugin' => $resource_field->getResourceMachineName(),
+      '#resource_plugin' => sprintf('%s:%d.%d', $resource_info['name'], $resource_info['majorVersion'], $resource_info['minorVersion']),
       '#cache_placeholder' => array(
         'parents' => array_merge($parents, array($public_field_name)),
         'parent_hashes' => $parent_hashes,

src/Plugin/resource/Decorators/ResourceDecoratorBase.php

@@ -368,6 +368,13 @@ public function doDelete($path) {
     return $this->process();
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public function getPluginId() {
+    return $this->subject->getPluginId();
+  }
+
   /**
    * If any method not declared, then defer it to the decorated field.
    *