命名路由组中的资源控制器导致路由名称问题？

I have a resource controller in a named route group, as follows:

Route::group(['middleware' => 'ldapauth', 'namespace' => 'Admin', 'prefix' => 'admin', 'as' => 'admin.'], function () {
    // other routes ...

    Route::resource('institution', 'InstitutionController');

});

And I'm getting an extra "admin" for the route names belonging to the resource controller routes, see here:

+-------------------------------------+--------------------------------+
| URI                                 | Name                           |
+-------------------------------------+--------------------------------+
| admin                               | admin.dashboard                |
| admin/email/{id}                    | admin.email.show               |
| admin/institution                   | admin.admin.institution.index  |
| admin/institution                   | admin.admin.institution.store  |
| admin/institution/contact           | admin.institution.contact      |
| admin/institution/create            | admin.admin.institution.create |
| admin/institution/{institution}     | admin.                         |
| admin/institution/{institution}     | admin.admin.institution.destroy|
| admin/institution/{institution}     | admin.admin.institution.update |
| admin/institution/{institution}     | admin.admin.institution.show   |
| admin/institution/{institution}/edit| admin.admin.institution.edit   |

Any guidance would be appreciated. Do I need to remove the resource controller outside of the group then reapply middleware etc?

Edit: I would like to keep the named 'as' => 'admin.' on the route group so I don't need to prefix all the routes in the group. So is this possible?

The best way to manage this is, passing middlewares in controller, add a construct to your controller, that would be like this:

class InstitutionController extends Controller {


    public function __construct()
    {
        $this->middleware('ldapauth');
    }

}

After that you can create resource:

Route::resource('admin/institution', 'Admin\InstitutionController');

Now you can access to route using:

{!! Form::open(['url' => route('admin.institution.contact')]) !!}

Also, you can see all the current routes with php artisan route:list. And you see a similar ouput of routing.