fix social action consistency

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

@@ -307,4 +307,59 @@ class SocialAction
 
         return $this;
     }
+
+    /**
+     * Recursive method which return true if the current $action
+     * is a descendant of the $action given in parameter.
+     */
+    public function isDescendantOf(SocialAction $action): bool
+    {
+        if (!$this->hasParent()) {
+            return false;
+        }
+
+        if ($this->getParent() === $action) {
+            return true;
+        }
+
+        return $this->getParent()->isDescendantOf($action);
+    }
+
+    /**
+     * In a SocialIssues's collection, find the elements which are an ancestor of
+     * other elements.
+     *
+     * The difference of the given list (thus, the elements which are **not** kept
+     * in the returned collection) are the most-grand-child elements of the list.
+     *
+     * Removing those elements of the Collection (which is not done by this method)
+     * will ensure that only the most descendent elements are present in the collection,
+     * (any ancestor of another element are present).
+     *
+     * @param Collection|SocialAction[] $socialActions
+     *
+     * @return Collection|SocialAction[] a list with the elements of the given list which are parent of other elements in the given list
+     */
+    public static function findAncestorSocialActions(Collection $socialActions): Collection
+    {
+        $ancestors = new ArrayCollection();
+
+        foreach ($socialActions as $candidateChild) {
+            if ($ancestors->contains($candidateChild)) {
+                continue;
+            }
+
+            foreach ($socialActions as $candidateParent) {
+                if ($ancestors->contains($candidateParent)) {
+                    continue;
+                }
+
+                if ($candidateChild->isDescendantOf($candidateParent)) {
+                    $ancestors->add($candidateParent);
+                }
+            }
+        }
+
+        return $ancestors;
+    }
 }