GET mastertasks, GET mastertasks/{id} endpointy

be/app/Models/Attachment.php

@@ -11,8 +11,8 @@ class Attachment extends Model
 
     public $timestamps = true;
 
-    public function subtask()
+    public function mastertask()
     {
-        return $this->belongsTo(SubTask::class);
+        return $this->belongsTo(MasterTask::class, 'master_task_id');
     }
 }