change some part of code

app/Models/AssignmentFails.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class AssignmentFails extends Model
+{
+    use HasFactory;
+    protected $guarded =[];
+
+    public function mission()
+    {
+        return $this->belongsTo(Mission::class);
+    }
+}