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Edit File: CityService.php

<?php

namespace App\Services;

use App\Models\City;

class CityService extends BaseService
{
    public function __construct()
    {
        parent::__construct(City::class);
    }

public function getAllCities()
    {
        return $this->model::all();
    }

public function getListOfCitiesAccordingToCountry($country_id = null)
    {
        return $this->model::where('country_id', $country_id)->get();
    }

public function allWithoutPagination()
    {
        return $this->model::has('neighborhoods')->get();
    }

public function delete($id)
    {
        $city = $this->model::findOrFail($id);

if ($city->users()->exists() || $city->providers()->exists()) {
            return ['key' => 'error', 'msg' => __('admin.city_related_with_users')];
        }

$city->delete();

return ['key' => 'success', 'msg' => __('admin.deleted_successfully')];
    }

public function deleteAll($request): array
    {
        $requestIds = json_decode($request['data']);
        $has_users = false;

foreach (array_column($requestIds, 'id') as $id) {
            $city = $this->model::findOrFail($id);

if ($city->users()->exists() || $city->providers()->exists() || $city->delegates()->exists()) {
                $has_users = true;
                break;
            } else {
                $city->delete();
            }
        }
        
        return [
            'key' => $has_users ? 'error' : 'success',
            'msg' => !$has_users ?  __('admin.deleted_successfully') : __('admin.some_related_with_users')
        ];
    }
}

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