create max holder validator

src/Bundle/ChillPersonBundle/Entity/Household/Household.php

@@ -98,6 +98,18 @@ class Household
         return $this->members;
     }
 
+    public function getMembersHolder(): Collection
+    {
+        $criteria = new Criteria();
+        $expr = Criteria::expr();
+
+        $criteria->where(
+            $expr->eq('holder', true)
+        );
+
+        return $this->getMembers()->matching($criteria);
+    }
+
     public function getCurrentMembers(?\DateTimeImmutable $now = null): Collection
     {
         $criteria = new Criteria();