Shoplocation.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Http\Request;

class Shoplocation extends Model
{
    protected $guarded = [];
    protected $hidden = ['created_at', 'updated_at', 'shop_id'];

    public function shop()
    {
        return $this->hasManyThrough(Shop::class, Category::class, 'shop_id', 'category_id', 'id', 'id ');
    }

    public function scopeByCity($query)
    {
        return $query->whereHas('shop', function ($query) {
            return $query->where('city_id', request()->hasCookie('loc') ? request()->cookie('loc') : 1);
        });
    }
}