API improvements (#1826)

src/Entity/ColorTrait.php

@@ -10,13 +10,21 @@
 namespace App\Entity;
 
 use Doctrine\ORM\Mapping as ORM;
+use JMS\Serializer\Annotation as Serializer;
+use Symfony\Component\Validator\Constraints as Assert;
 
 trait ColorTrait
 {
     /**
+     * The assigned color in HTML hex format, eg. #dd1d00
+     *
      * @var string
      *
+     * @Serializer\Expose()
+     * @Serializer\Groups({"Default"})
+     *
      * @ORM\Column(name="color", type="string", length=7, nullable=true)
+     * @Assert\Length(min=4, max=7)
      */
     private $color = null;