add many2many relation between socialIssue and accompanying period + api endpoint

src/Bundle/ChillPersonBundle/Entity/SocialWork/SocialIssue.php

@@ -6,10 +6,15 @@ use Chill\PersonBundle\Repository\SocialWork\SocialIssueRepository;
 use Doctrine\Common\Collections\ArrayCollection;
 use Doctrine\Common\Collections\Collection;
 use Doctrine\ORM\Mapping as ORM;
+use Symfony\Component\Serializer\Annotation\Groups;
+use Symfony\Component\Serializer\Annotation\DiscriminatorMap;
 
 /**
  * @ORM\Entity(repositoryClass=SocialIssueRepository::class)
  * @ORM\Table(name="chill_person_social_issue")
+ * @DiscriminatorMap(typeProperty="type", mapping={
+ *   "social_issue"=SocialIssue::class
+ * })
  */
 class SocialIssue
 {
@@ -37,6 +42,7 @@ class SocialIssue
 
     /**
      * @ORM\Column(type="json")
+     * @Groups({"read"})
      */
     private $title = [];
 
@@ -61,6 +67,11 @@ class SocialIssue
         return $this->parent;
     }
 
+    public function hasParent(): bool
+    {
+        return $this->parent !== null;
+    }
+
     public function setParent(?self $parent): self
     {
         $this->parent = $parent;