Add singular types support (#15)

* add singular types support

* fix missed Inflector

Author: kfreiman

src/ResourceTrait.php

@@ -28,7 +28,7 @@ public function getType()
     {
         $reflect = new \ReflectionClass($this);
         $className = $reflect->getShortName();
-        return Inflector::pluralize(Inflector::camel2id($className));
+        return Inflector::camel2id($className);
     }
 
     /**

src/Serializer.php

@@ -14,6 +14,7 @@
 use yii\web\Linkable;
 use yii\web\Request;
 use yii\web\Response;
+use yii\helpers\Inflector;
 
 class Serializer extends Component
 {
@@ -48,7 +49,10 @@ class Serializer extends Component
      * @var Response the response to be sent. If not set, the `response` application component will be used.
      */
     public $response;
-
+    /**
+     * @var bool whether to automatically pluralize the `type` of resource.
+     */
+    public $pluralize = true;
 
     /**
      * @inheritdoc
@@ -113,7 +117,7 @@ protected function serializeModel(ResourceInterface $model)
 
                 if (!empty($relationship)) {
                     if (in_array($name, $included)) {
-                        $data['relationships'][$name]['data'] = $relationship;   
+                        $data['relationships'][$name]['data'] = $relationship;
                     }
                 }
                 if ($model instanceof LinksInterface) {
@@ -167,6 +171,9 @@ protected function serializeIdentifier(ResourceIdentifierInterface $identifier)
             if ($value === null || is_array($value) || (is_object($value) && !method_exists($value, '__toString'))) {
                 throw new InvalidValueException("The value {$key} of resource object " . get_class($identifier) . ' MUST be a string.');
             }
+            if ($key === 'type' && $this->pluralize) {
+                $value = Inflector::pluralize($value);
+            }
             $result[$key] = (string) $value;
         }
         return $result;