Laravel - Route with variable

Question

Good morning Sirs. I have a question about the route in the Laravel, I carried through researches trying to find the result but I did not find what I wanted.

I need that from the id that is redirected (for example: /discipline/3) it sends the number "3" to the parameter of my method return_discipline($id) so I can work with it. I tried to do as below but nothing worked so far. What should I do?

Thank you

Code in web.php file

Route::get('/disciplina/{id}', "select@retorna_disciplina(id)")->middleware('login');

Code in the controller

 public function retorna_disciplina($id)
    {
        $prontuario = session('prontuario');
        $cargo = session('cargo');

        if($cargo == "P")
        {
            $disciplina = DB::table('oferecimento_disciplina')
                ->where('id_professor','=', $prontuario)
                ->where('dsa', '=', $id)
                ->first();

            if(count($disciplina)>0)
            {
                $postagens = DB::table('postagens')
                    ->where('dsa', '=', $id)
                    ->get();
                return view('disciplinas.disciplina')->with([
                        'disciplina' => $disciplina,
                        'postagens' => $postagens
                    ]);
            }
            else{
                Redirect::to('/perfil')->withErros("A disciplina não existe ou você não tem permissão de acesso");
            }
        }
}

Answer 1

Your Route has a small error, it should be like this (I assume the controller name and the file name are right and is "select"):

Route::get('/disciplina/{id}', "select@retorna_disciplina")->middleware('login');

In the controller must have:

use Illuminate\Http\Request; // caso não tenha já isto, deve estar no topo ao lado dos outros "use" que deve ter
...
public function retorna_disciplina(Request $request) {
    $id = $request->id;
    ....
}

The variable $request, stores the information about the request, in which part of it are the parameters sent via GET, in this case the id.

Answer 2

You only need to specify in your route expression which parameter will be variable in the url. Then, in your controller, you set the desired parameter to capture the url parameter in your specific method.

See the example below.

Controller:

class SiteController extends Controller
{
      public function getArticle($id)
      {
         dd($id);
      }
}

Route:

Route::get('site/article/{id}', 'SiteController@getArticle');

In the case above, when you call the route site/article/5, the parameter $id of the method getArticle will have the value 5.

Note that to indicate which passage of the url will have the variable parameter, you need to use a keyed word {}.

If necessary to use Request in your method, you can do so:

class SiteController extends Controller
{
      public function getArticle(Request $request, $id)
      {
         dd($id);
      }
}