main

app/Models/City.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class City extends Model
+{
+    use HasFactory;
+    public $timestamps = false;
+    protected $fillable=[
+        'title',
+        'code',
+        'parent_id',
+        'has_children',
+        'level'
+    ];
+    protected $casts = [
+        'has_children'=>'boolean'
+    ];
+    static $LEVEL = [
+        1=>'استان',
+        2=>'شهر',
+    ];
+    public function children(){
+        return $this->hasMany(City::class,'parent_id')->with('children');
+    }
+    public function parent(){
+        return $this->belongsTo(City::class,'parent_id')->with('parent');
+    }
+}