Add support for Doctrine mapped superclasses

src/Metadata/Driver/AbstractDoctrineTypeDriver.php

@@ -107,6 +107,12 @@ public function loadMetadataForClass(\ReflectionClass $class): ?BaseClassMetadat
             $this->setPropertyType($doctrineMetadata, $propertyMetadata);
         }
 
+        // Add fields from mapped superclasses
+        if ($parentClass = $doctrineMetadata->getReflectionClass()->getParentClass()) {
+            $parentClassMetadata = $this->loadMetadataForClass($parentClass);
+            $classMetadata->propertyMetadata = array_merge($parentClassMetadata->propertyMetadata, $classMetadata->propertyMetadata);
+        }
+
         return $classMetadata;
     }
 

tests/Fixtures/Doctrine/Entity/AbstractBlogPost.php

@@ -0,0 +1,103 @@
+<?php
+
+declare(strict_types=1);
+
+namespace JMS\Serializer\Tests\Fixtures\Doctrine\Entity;
+
+use Doctrine\ORM\Mapping as ORM;
+use JMS\Serializer\Annotation as Serializer;
+use JMS\Serializer\Annotation\Groups;
+use JMS\Serializer\Annotation\SerializedName;
+use JMS\Serializer\Annotation\Type;
+use JMS\Serializer\Annotation\XmlAttribute;
+
+/**
+ * @ORM\MappedSuperclass
+ */
+abstract class AbstractBlogPost
+{
+    /**
+     * @ORM\Id @ORM\Column(type="integer") @ORM\GeneratedValue(strategy="AUTO")
+     */
+    protected $id;
+
+    /**
+     * @ORM\Column(type="guid")
+     */
+    private $guid;
+
+    /**
+     * @ORM\Column(type="string")
+     *
+     * @Groups({"post"})
+     */
+    #[Groups(groups: ['post'])]
+    private $title;
+
+    /**
+     * @ORM\Column(type="some_custom_type")
+     */
+    protected $slug;
+
+    /**
+     * @ORM\Column(type="datetime")
+     *
+     * @XmlAttribute
+     */
+    #[XmlAttribute]
+    private $createdAt;
+
+    /**
+     * @ORM\Column(type="boolean")
+     *
+     * @Type("integer")
+     * This boolean to integer conversion is one of the few changes between this
+     * and the standard BlogPost class. It's used to test the override behavior
+     * of the DoctrineTypeDriver so notice it, but please don't change it.
+     * @SerializedName("is_published")
+     * @Groups({"post"})
+     * @XmlAttribute
+     */
+    #[Type(name: 'integer')]
+    #[SerializedName(name: 'is_published')]
+    #[Groups(groups: ['post'])]
+    #[XmlAttribute]
+    private $published;
+
+    /**
+     * @ORM\OneToOne(targetEntity="Author")
+     *
+     * @Groups({"post"})
+     */
+    #[Groups(groups: ['post'])]
+    private $author;
+
+    /**
+     * @Serializer\Exclude()
+     * @ORM\Column(type="integer")
+     */
+    #[Serializer\Exclude]
+    private $ref;
+
+    public function __construct($title, Author $author, \DateTime $createdAt)
+    {
+        $this->title = $title;
+        $this->author = $author;
+        $this->published = false;
+        $this->createdAt = $createdAt;
+    }
+
+    public function setPublished()
+    {
+        $this->published = true;
+    }
+
+    /**
+     * @Serializer\VirtualProperty()
+     */
+    #[Serializer\VirtualProperty]
+    public function getRef()
+    {
+        return $this->ref;
+    }
+}

tests/Fixtures/Doctrine/Entity/BlogPost.php

@@ -6,11 +6,7 @@
 
 use Doctrine\Common\Collections\ArrayCollection;
 use Doctrine\ORM\Mapping as ORM;
-use JMS\Serializer\Annotation as Serializer;
 use JMS\Serializer\Annotation\Groups;
-use JMS\Serializer\Annotation\SerializedName;
-use JMS\Serializer\Annotation\Type;
-use JMS\Serializer\Annotation\XmlAttribute;
 use JMS\Serializer\Annotation\XmlList;
 use JMS\Serializer\Annotation\XmlRoot;
 
@@ -20,56 +16,8 @@
  * @XmlRoot("blog-post")
  */
 #[XmlRoot(name: 'blog-post')]
-class BlogPost
+class BlogPost extends AbstractBlogPost
 {
-    /**
-     * @ORM\Id @ORM\Column(type="integer") @ORM\GeneratedValue(strategy="AUTO")
-     */
-    protected $id;
-
-    /**
-     * @ORM\Column(type="guid")
-     */
-    private $guid;
-
-    /**
-     * @ORM\Column(type="string")
-     *
-     * @Groups({"comments","post"})
-     */
-    #[Groups(groups: ['comments', 'post'])]
-    private $title;
-
-    /**
-     * @ORM\Column(type="some_custom_type")
-     */
-    protected $slug;
-
-    /**
-     * @ORM\Column(type="datetime")
-     *
-     * @XmlAttribute
-     */
-    #[XmlAttribute]
-    private $createdAt;
-
-    /**
-     * @ORM\Column(type="boolean")
-     *
-     * @Type("integer")
-     * This boolean to integer conversion is one of the few changes between this
-     * and the standard BlogPost class. It's used to test the override behavior
-     * of the DoctrineTypeDriver so notice it, but please don't change it.
-     * @SerializedName("is_published")
-     * @Groups({"post"})
-     * @XmlAttribute
-     */
-    #[Type(name: 'integer')]
-    #[SerializedName(name: 'is_published')]
-    #[Groups(groups: ['post'])]
-    #[XmlAttribute]
-    private $published;
-
     /**
      * @ORM\OneToMany(targetEntity="Comment", mappedBy="blogPost")
      *
@@ -80,46 +28,14 @@ class BlogPost
     #[Groups(groups: ['comments'])]
     private $comments;
 
-    /**
-     * @ORM\OneToOne(targetEntity="Author")
-     *
-     * @Groups({"post"})
-     */
-    #[Groups(groups: ['post'])]
-    private $author;
-
-    /**
-     * @Serializer\Exclude()
-     * @ORM\Column(type="integer")
-     */
-    #[Serializer\Exclude]
-    private $ref;
-
     public function __construct($title, Author $author, \DateTime $createdAt)
     {
-        $this->title = $title;
-        $this->author = $author;
-        $this->published = false;
+        parent::__construct($title, $author, $createdAt);
         $this->comments = new ArrayCollection();
-        $this->createdAt = $createdAt;
-    }
-
-    public function setPublished()
-    {
-        $this->published = true;
     }
 
     public function addComment(Comment $comment)
     {
         $this->comments->add($comment);
     }
-
-    /**
-     * @Serializer\VirtualProperty()
-     */
-    #[Serializer\VirtualProperty]
-    public function getRef()
-    {
-        return $this->ref;
-    }
 }