How can I display the validation error messages in the Login view of the UsersController?

Need Help
1

How can I display the validation error messages in the Login view of the UsersController?

Hi, I hope someone can help me. How can I get to show the validation errors when entering wrong data fields of the login form? in add, edit when submitting the form are displayed correctly.

Users/login.ctp

			<h1 class="h4 mb-3 font-weight-bold">Acceso administración</h1>
			<?= $this->Form->create() ?>
			<fieldset>
			<?= $this->Form->control('username',['class' =>'form-control mb-2','placeholder' => 'Nombre de usuario','label' => false ,'escape' => false]);?>


			<?= $this->Form->control('password',['class' =>'form-control mb-2','placeholder' => 'Contraseña','label' => false ,'escape' => false]);?>
		
			<?= $this->Form->button(__('Acceder'),['class' => 'btn btn-lg btn-success w-100 my-3'])?>
			<?= $this->Form->end() ?>
			</fieldset>
			</div>
		</div>

UsersTable.php

class UsersTable extends Table
{

 public function validationDefault(Validator $validator){
    $validator
        ->requirePresence('username', true)
        ->notEmptyString('username', 'El nombre de usuario es obligatorio', false)
        ->add('username', [
                'unique' => [
                    'rule' => 'validateUnique',
                    'provider' => 'table',
                    'message' => 'El nombre de usuario ya existe'
                ]
    ]);

    $validator
        ->allowEmptyString('password', 'La contraseña es obligatoria', false)
        ->add('password', [
            'length' => [
                'rule' => ['minLength', 5],
                'message' => 'La contraseña debe tener mínimo 5 caracteres',
            ]
    ]);
 

    return $validator;
}

Action login in UsersController.php

public function login(){

    $this->viewBuilder()->setLayout('publico');

    if ($this->request->is('post')) {
        $user = $this->Auth->identify();
        
        if ($user) {
            $this->Auth->setUser($user);
            $this->Flash->success(__('El administrador ha iniciado sesión correctamente'));
            return $this->redirect($this->Auth->redirectUrl());
        }

        $this->Flash->error(__('Nombre de usuario o contraseña incorrectos, inténtalo de nuevo.'));
    }
}

Thank you very much and I hope someone can help me

2

The Form helper will generally detect and render error messages but it needs access to your Entity to do that work.

Typically that will happen something like this:

public function login(){

    $entity = new Entity([]);

        if ($this->request->is('post') {
            $this->Model->patchEntity($entity, $this->request->getData();
            // other code here redirects on successful process
        }

        // now entity is either new and empty or 
        // contains the user's posted input values and 
        // error messages created during `patch` or `save` processes
        $this->set('entity', $entity);
    }
}

Now with the entity (containing data and error details) available in your template, you will need to give it to the Form helper.

Users/login.ctp
// Form->create() gets the entity as an argument

echo $this->Form->create($entity);

   echo $this->Form->control('username',);
   echo $this->Form->control('password');
   echo $this->Form->button(__('Acceder'));

echo $this->Form->end();

Now, if the control names match the entity property names, everything should work.

So, your going to need to look at what $user = $this->Auth->identify(); delivers to you. If it is an entity you just need to follow the general pattern outlined above and the Form::control() calls should detect and render validation errors.