hierarchy & gantt cascade delete

app/Models/Activity.php

@@ -79,8 +79,14 @@ class Activity extends Model
 		});
 
 		static::deleted(function($data) {
-			if(Activity::where("parent_id", $data->parent_id)->count() == 0)
+            if (isset($data->parent_id)) {
-				Activity::find($data->parent_id)->update(["type_activity"=>"task"]);
+                if(Activity::where("parent_id", $data->parent_id)->count() == 0) {
+					$activity = Activity::find($data->parent_id);
+					if ($activity) {
+				    	$activity->update(["type_activity"=>"task"]);
+					}
+				}
+            }
 
 			$data->updateBobot(true);
 			$data->updateCostPlanning();
@@ -100,7 +106,7 @@ class Activity extends Model
 			->whereNull('parent_id')
 			->first();
 
-		if($root->rencana_biaya > 0){
+		if(isset($root) && $root->rencana_biaya > 0){
 			$activities = Activity::where("proyek_id", $this->proyek_id)->where("version_gantt_id", $this->version_gantt_id)->get();
 			foreach ($activities as $activity) {
 				if($isDelete && $activity->id == $this->id)

app/Models/HierarchyFtth.php

@@ -3,6 +3,7 @@
 namespace App\Models;
 
 use Illuminate\Database\Eloquent\Model;
+use App\Models\VersionGantt;
 
 class HierarchyFtth extends Model
 {
@@ -23,6 +24,11 @@ class HierarchyFtth extends Model
           foreach ($ftths as $ftth) {
               $ftth->delete();
           }
+
+          $gantts = VersionGantt::where('hierarchy_ftth_id', $data->id)->get();
+          foreach ($gantts as $gantt) {
+            $gantt->delete();
+          }
 		});
 	}
 }

app/Models/VersionGantt.php

@@ -39,6 +39,13 @@ class VersionGantt extends Model
 		static::updated(function($data) {
 			$data->updateActDuration();
         });
+
+    static::deleted(function ($data) {
+      $activities = Activity::where('version_gantt_id', $data->id)->get();
+      foreach ($activities as $activity) {
+        $activity->delete();
+      }
+		});
 	}
 
     public function updateActDuration(){