policies updated

app/Models/Participant.php

@@ -11,17 +11,20 @@ class Participant extends Model
 
     /**
      * The attributes that aren't mass assignable.
-     *
      * @var array
      */
     protected $guarded = [];
 
     /**
      * The attributes that should be cast to native types.
-     *
      * @var array
      */
     protected $casts = [
         'id' => 'integer',
     ];
+
+    public function registrations()
+    {
+        return $this->hasMany(\App\Models\Registration::class);
+    }
 }