Controller Post Laravel

ArticuloController.php

<?php

class ArticuloController extends BaseController {

	public function index()
	{
        $articulos = Articulo::orderBy('created_at', 'DESC')->get();
        $total = Articulo::count();
        // load the view and pass the nerds
        return View::make('articulos.index')->with(array('articulos' => $articulos, 'total' => $total));
	}
	public function create()
	{
		return View::make('articulos.create');
	}
	public function store()
	{
		$carpetaDestino = "uploads";
		$nombreImagen;
        $rules = array(
            'nombre'       => 'required',
            'cuerpo'      => 'required',
            'imagen_destacada' => 'required'
        );
        $validator = Validator::make(Input::all(), $rules);

        if(Input::hasFile('imagen_destacada')) {
            $nombreImagen = $this->generar_clave(15). '.' . Input::file('imagen_destacada')->getClientOriginalExtension();
     	}
        if ($validator->fails()) {
            return Redirect::to('articulos/create')
                ->withErrors($validator)
                ->withInput(Input::except('password'));
        } else {
            $articulo = new Articulo;
            $articulo->nombre       = Input::get('nombre');
            $articulo->cuerpo      = preg_replace('(\n)', '<br/><br/>', Input::get('cuerpo'));
            $articulo->imagen_destacada = $nombreImagen;
            $articulo->slug = $this->crear_slug(Input::get('nombre'));
            $articulo->etiquetas = Input::get('etiquetas');
            $articulo->id_author = Auth::id();;

            if($articulo->save()){
            	Input::file('imagen_destacada')->move($carpetaDestino,$nombreImagen);
            }
            Session::flash('message', 'Successfully created article!');
            return Redirect::to('articulos');
        }
	}
	public function show($id)
	{
        $articulo = Articulo::find($id);
        return View::make('articulos.show')->with('articulo', $articulo);
	}
	public function edit($id)
	{
        $articulo = Articulo::find($id);
        return View::make('articulos.edit')
            ->with('articulo', $articulo);
	}
	public function update($id)
	{
        $carpetaDestino = "uploads";
        $nombreImagen;
		
        $rules = array(
            'nombre'       => 'required',
            'cuerpo'      => 'required',
        );
        $validator = Validator::make(Input::all(), $rules);

        if(Input::hasFile('imagen_destacada')) {
            $nombreImagen = $this->generar_clave(15). '.' . Input::file('imagen_destacada')->getClientOriginalExtension();
        }else{
            $articulo = Articulo::find($id);
            $nombreImagen = $articulo->imagen_destacada;
        }
        if ($validator->fails()) {
            return Redirect::to('articulos/' . $id . '/edit')
                ->withErrors($validator)
                ->withInput(Input::except('password'));
        } else {
            $articulo = Articulo::find($id);
            $articulo->nombre       = Input::get('nombre');
            $articulo->cuerpo      = preg_replace('(\n)', "<br/>", Input::get('cuerpo'));
            $articulo->etiquetas = Input::get('nombre');
            $articulo->imagen_destacada = $nombreImagen;
            $articulo->save();
            Session::flash('message', 'Successfully updated article!');
            return Redirect::to('articulos');
        }
	}
	public function destroy($id)
	{
        $articulo = Articulo::find($id);
        $articulo->delete();
        Session::flash('message', 'Successfully deleted the article!');
        return Redirect::to('articulos');
	}

    public function crear_slug($string)
    {
        $characters = array("Á" => "A", "Ç" => "c", "É" => "e", "Í" => "i", "Ñ" => "n", "Ó" => "o", "Ú" => "u", "á" => "a", "ç" => "c", "é" => "e", "í" => "i", "ñ" => "n", "ó" => "o", "ú" => "u", "à" => "a", "è" => "e", "ì" => "i", "ò" => "o", "ù" => "u");
        $string = strtr($string, $characters);
        $string = strtolower(trim($string));
        $string = preg_replace("/[^a-z0-9-]/", "-", $string);
        $string = preg_replace("/-+/", "-", $string);
        if(substr($string, strlen($string) - 1, strlen($string)) === "-")
        {
            $string = substr($string, 0, strlen($string) - 1);
        }
        return $string;
    }

	private function generar_clave($longitud){ 
       $cadena="[^A-Z0-9]"; 
       return substr(preg_replace($cadena, "", md5(rand())) . 
       preg_replace($cadena, "", md5(rand())) . 
       preg_replace($cadena, "", md5(rand())), 
       0, $longitud); 
	}  


}