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app/Models/SubDepartment.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class SubDepartment extends Model
+{
+    public function department() : BelongsTo
+    {
+        return $this->belongsTo(Department::class);
+    }
+}