Added a possibility to have singular embedded fields

Annotation/Embedded.php

@@ -27,4 +27,6 @@ final class Embedded extends AbstractAnnotation implements PropertiesAwareInterf
      * @Doctrine\Common\Annotations\Annotation\Required
      */
     public $class;
+
+    public $singular = false;
 }

Mapping/Converter.php

@@ -87,13 +87,18 @@ protected function denormalize(array $raw, string $namespace)
             $setter = $fieldMeta['setter'];
 
             if ($fieldMeta['embeded']) {
-                $this->addClassMetadata($fieldMeta['class'], $fieldMeta['sub_properties']);
-                $iterator = new ObjectIterator($fieldMeta['class'], $value, $this);
+		$this->addClassMetadata($fieldMeta['class'], $fieldMeta['sub_properties']);
 
-                if ($fieldMeta['public']) {
-                    $object->{$fieldMeta['name']} = $iterator;
+                if ($fieldMeta['singular']) {
+                    $object->$setter($this->denormalize($value, $fieldMeta['class']));
                 } else {
-                    $object->$setter($iterator);
+                    $iterator = new ObjectIterator($fieldMeta['class'], $value, $this);
+
+                    if ($fieldMeta['public']) {
+                        $object->{$fieldMeta['name']} = $iterator;
+                    } else {
+                        $object->$setter($iterator);
+                    }
                 }
             } else {
                 if ($fieldMeta['type'] == 'date') {

Mapping/DocumentParser.php

@@ -130,6 +130,7 @@ private function getClassMetadata(\ReflectionClass $class): array
                     $fieldMapping['type'] = $this->getObjectMappingType($embeddedClass);
                     $fieldMapping['properties'] = $this->getClassMetadata($embeddedClass);
                     $embeddedFields[$name] = $annotation->class;
+                    $embeddedFields['singular'] = $annotation->singular;
                 }
 
                 $mapping[$annotation->getName() ?? Caser::snake($name)] = array_filter($fieldMapping);
@@ -207,6 +208,7 @@ public function getPropertyMetadata(\ReflectionClass $class, bool $subClass = fa
                 if ($annotation instanceof Embedded) {
                     $propertyMetadata['embeded'] = true;
                     $propertyMetadata['class'] = $annotation->class;
+                    $propertyMetadata['singular'] = $annotation->singular;
                     $propertyMetadata['sub_properties'] = $this->getPropertyMetadata(
                         new \ReflectionClass($annotation->class),
                         true

Resources/doc/mapping.md

@@ -209,26 +209,31 @@ class Product
     /**
      * @var ContentMetaObject
      *
-     * @ES\Embedded(class="App\Document\CategoryObject")
+     * @ES\Embedded(class="App\Document\CategoryObject", singular=true)
      */
     private $category;
 
     //...
 
-    public function __construct()
+    public funtion setCategory($category)
     {
-        $this->category = new ArrayCollection();
+        $this->category = $category;
     }
 
-    public funtion addCategory($category)
+    public function getCategory($category)
     {
-        $this->category->add($category)
+        return $this->category;
     }
 
     //...
 }
 ```
 
+Please note that if you want the category to be embedded as a singular 
+object (not an array of objects), you need to use the `singular=true` in the
+annotation, otherwise it will be interpreted as a collection. Read more on
+embedding collections bellow.
+
 And the `Category` object will look like (it's a separate class):
 
 ```php