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Edit File: Country.php

<?php

namespace App\Models;

use App\Traits\ModelTrait;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Spatie\Translatable\HasTranslations;

class Country extends BaseModel
{
    use HasTranslations, ModelTrait;
    const IMAGEPATH = 'countries';

protected $fillable = ['name', 'key', 'flag'];

public $translatable = ['name'];

/**
     * Get the flag attribute.
     * @return string
     */
    public function getFlagAttribute(): string
    {
        if ($this->attributes['flag']) {
            $flag = asset('admin/assets/flags/png/' . $this->attributes['flag']);
        } else {
            $flag = $this->defaultImage('users');
        }
        return $flag;
    }

/**
     * Get the flag attribute.
     * @return string
     */
    public function myFlag(): string
    {
        return $this->attributes['flag'];
    }

public function cities()
    {
        return $this->hasMany(City::class, 'country_id', 'id');
    }

public static function boot()
    {
        parent::boot();

static::deleting(function ($country) {
            if($country->cities()->exists()) {
                throw new \Exception(__('admin.this_country_has_cities_cannot_be_deleted'));
            }
        });
    }
}

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