Cakephp 3.0 Issue in validation when we use different validation set - validation

Question

I have a custom form for Change Password functionality. But the validations are not properly working on this page.
The template file (change_password.ctp) is:
<div class="users index large-9 medium-8 columns content">
<?= $this->Form->create('change_password') ?>
<fieldset>
<legend><?= __('Change password') ?></legend>
<?= $this->Form->input('old_password', ['type' => 'password', 'label' => 'Old password']) ?>
<?= $this->Form->input('new_password', ['type' => 'password', 'label' => 'Password']) ?>
<?= $this->Form->input('confirm_password', ['type' => 'password', 'label' => 'Repeat password']) ?>
</fieldset>
<?= $this->Form->button(__('Change')) ?>
<?= $this->Form->end() ?>
</div>
The validation code included in a custom function in UsersTable.php page:
public function validationChangePassword(Validator $validator) {
$validator
->requirePresence('old_password', 'create')
->notEmpty('old_password');
$validator
->requirePresence('new_password', 'create')
->notEmpty('new_password');
$validator
->notEmpty('confirm_password')
->add('confirm_password', 'no-misspelling', [
'rule' => ['compareWith', 'new_password'],
'message' => 'Passwords are not equal',
]);
return $validator;
}
I included the changePassword() action in the controller UsersController.php
public function changePassword() {
$user = $this->Users->newEntity();
if (isset($this->request->data) && !empty($this->request->data)) {
$user = $this->Users->patchEntity($user, $this->request->data, [
'validate' => 'changePassword'
]);
if ($user->errors()) {
$this->Flash->success(__('Error'));
}
}
}

Answer 1

Update your action as below:
public function changePassword() {
$user = $this->Users->newEntity();
if (isset($this->request->data) && !empty($this->request->data)) {
$user = $this->Users->patchEntity($user, $this->request->data, [
'validate' => 'changePassword'
]);
if ($user->errors()) {
$this->Flash->success(__('Error'));
}
}
$this->set(compact('user'));
}