Laravel - Inconnu de la colonne dans la liste de champs

Copains, je suis havin un problème pour sauvegarder un enregistrement de la base de données.
Comme je comprends l'erreur, il semble qu'il n'existe pas un "id_purchase" dans le tableau. Mais il le fait.
Le code que j'utilise est la suivante:

<?php

class Purchproducts_Controller extends Base_Controller {

    public $restful = true;    

    public function get_index()
    {
        $purchases = Purchproduct::where('id_hostel', '=', Session::get('id_hostel'))->get();
        $response = array();
        foreach($purchases as $purch){
            $response[] = $purch->attributes;
        }
        return json_encode($response);
    }    

    public function post_create()
    {
        $data = Input::json();
        $purchase = Purchproduct::create(
            array(
                'id_hostel' => Session::get('id_hostel'),
                'id_products' => $data->id_products,
                'id_purchase,' => $data->id_purchases,
                'qty' => $data->qty
            )
        );

        return json_encode($purchase->attributes);
    }  
}

L'écran d'erreur:

Unhandled Exception
Message:

SQLSTATE[42S22]: Column not found: 1054 Unknown column 'id_purchase,' in 'field list'

SQL: INSERT INTO `ehm_purchproducts` (`id_hostel`, `id_products`, `id_purchase,`, `qty`, `updated_at`, `created_at`) VALUES (?, ?, ?, ?, ?, ?)

Bindings: array (
  0 => 1,
  1 => '2',
  2 => 2,
  3 => '12',
  4 => '2013-04-16 22:00:32',
  5 => '2013-04-16 22:00:32',
)

Location:

/home/pablo/htdocs/insdev/laravel/laravel/database/connection.php on line 263

Stack Trace:

#0 /home/pablo/htdocs/insdev/laravel/laravel/database/connection.php(183): Laravel\Database\Connection->execute('INSERT INTO `eh...', Array)
#1 /home/pablo/htdocs/insdev/laravel/laravel/database/query.php(823): Laravel\Database\Connection->query('INSERT INTO `eh...', Array)
#2 [internal function]: Laravel\Database\Query->insert_get_id(Array, 'id')
#3 /home/pablo/htdocs/insdev/laravel/laravel/database/eloquent/query.php(283): call_user_func_array(Array, Array)
#4 /home/pablo/htdocs/insdev/laravel/laravel/database/eloquent/model.php(390): Laravel\Database\Eloquent\Query->__call('insert_get_id', Array)
#5 /home/pablo/htdocs/insdev/laravel/laravel/database/eloquent/model.php(390): Laravel\Database\Eloquent\Query->insert_get_id(Array, 'id')
#6 /home/pablo/htdocs/insdev/laravel/laravel/database/eloquent/model.php(205): Laravel\Database\Eloquent\Model->save()
#7 /home/pablo/htdocs/insdev/laravel/application/controllers/purchproducts.php(27): Laravel\Database\Eloquent\Model::create(Array)
#8 [internal function]: Purchproducts_Controller->post_create()
#9 /home/pablo/htdocs/insdev/laravel/laravel/routing/controller.php(325): call_user_func_array(Array, Array)
#10 /home/pablo/htdocs/insdev/laravel/laravel/routing/controller.php(285): Laravel\Routing\Controller->response('create', Array)
#11 /home/pablo/htdocs/insdev/laravel/laravel/routing/controller.php(165): Laravel\Routing\Controller->execute('create', Array)
#12 /home/pablo/htdocs/insdev/laravel/laravel/routing/route.php(153): Laravel\Routing\Controller::call('purchproducts@c...', Array)
#13 /home/pablo/htdocs/insdev/laravel/laravel/routing/route.php(124): Laravel\Routing\Route->response()
#14 /home/pablo/htdocs/insdev/laravel/laravel/laravel.php(167): Laravel\Routing\Route->call()
#15 /home/pablo/htdocs/insdev/laravel/public/index.php(34): require('/home/pablo/htd...')
#16 {main}

La structure de la table:

CREATE TABLE IF NOT EXISTS `ehm_purchproducts` (
  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `id_hostel` int(11) NOT NULL,
  `id_products` int(11) NOT NULL,
  `id_purchase` int(11) NOT NULL,
  `recibo` varchar(200) COLLATE utf8_spanish_ci NOT NULL,
  `qty` int(11) NOT NULL,
  `created_at` datetime NOT NULL,
  `updated_at` datetime NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_spanish_ci AUTO_INCREMENT=1 ;

Des idées?

OriginalL'auteur Pablo | 2013-04-16