I am new in Laravel.
I made controller, Model and views by way/generator by composer php artisan generate:scaffold cities and Its index p
php artisan generate:scaffold cities
In your model you have protected $primaryKey='city_id'; but in your view you have:
protected $primaryKey='city_id';
{{ Form::model($city,array('route'=>array('admin.cities.update',$city->id),'method'=>'PUT','files'=>true)) }}
I mean $city->id should be $city->city_id
$city->id
$city->city_id