Issue #2209977 by tim.plunkett: Move form validation logic out of FormBuilder into a new class.

core/core.services.yml

@@ -126,7 +126,10 @@ services:
     arguments: [default]
   form_builder:
     class: Drupal\Core\Form\FormBuilder
-    arguments: ['@module_handler', '@keyvalue.expirable', '@event_dispatcher', '@url_generator', '@string_translation', '@request_stack', '@?csrf_token', '@?http_kernel']
+    arguments: ['@form_validator', '@module_handler', '@keyvalue.expirable', '@event_dispatcher', '@url_generator', '@request_stack', '@?csrf_token', '@?http_kernel']
+  form_validator:
+    class: Drupal\Core\Form\FormValidator
+    arguments: ['@request_stack', '@string_translation', '@csrf_token']
   keyvalue:
     class: Drupal\Core\KeyValueStore\KeyValueFactory
     arguments: ['@service_container', '@settings']

core/includes/form.inc

@@ -11,6 +11,7 @@
 use Drupal\Component\Utility\UrlHelper;
 use Drupal\Component\Utility\Xss;
 use Drupal\Core\Database\Database;
+use Drupal\Core\Form\OptGroup;
 use Drupal\Core\Language\Language;
 use Drupal\Core\Render\Element;
 use Drupal\Core\Template\Attribute;
@@ -323,7 +324,7 @@ function drupal_prepare_form($form_id, &$form, &$form_state) {
  * @deprecated in Drupal 8.x-dev, will be removed before Drupal 8.0.
  *   Use \Drupal::formBuilder()->validateForm().
  *
- * @see \Drupal\Core\Form\FormBuilderInterface::validateForm().
+ * @see \Drupal\Core\Form\FormValidatorInterface::validateForm().
  */
 function drupal_validate_form($form_id, &$form, &$form_state) {
   \Drupal::formBuilder()->validateForm($form_id, $form, $form_state);
@@ -345,12 +346,19 @@ function drupal_redirect_form($form_state) {
  * Executes custom validation and submission handlers for a given form.
  *
  * @deprecated in Drupal 8.x-dev, will be removed before Drupal 8.0.
- *   Use \Drupal::formBuilder()->executeHandlers().
+ *   Use either \Drupal::formBuilder()->executeSubmitHandlers() or
+ *   \Drupal::service('form_validator')->executeValidateHandlers().
  *
- * @see \Drupal\Core\Form\FormBuilderInterface::executeHandlers().
+ * @see \Drupal\Core\Form\FormBuilderInterface::executeSubmitHandlers()
+ * @see \Drupal\Core\Form\FormValidatorInterface::executeValidateHandlers()
  */
 function form_execute_handlers($type, &$form, &$form_state) {
-  \Drupal::formBuilder()->executeHandlers($type, $form, $form_state);
+  if ($type == 'submit') {
+    \Drupal::formBuilder()->executeSubmitHandlers($form, $form_state);
+  }
+  elseif ($type == 'validate') {
+    \Drupal::service('form_validator')->executeValidateHandlers($form, $form_state);
+  }
 }
 
 /**
@@ -359,7 +367,7 @@ function form_execute_handlers($type, &$form, &$form_state) {
  * @deprecated in Drupal 8.x-dev, will be removed before Drupal 8.0.
  *   Use \Drupal::formBuilder()->setErrorByName().
  *
- * @see \Drupal\Core\Form\FormBuilderInterface::setErrorByName().
+ * @see \Drupal\Core\Form\FormErrorInterface::setErrorByName().
  */
 function form_set_error($name, array &$form_state, $message = '') {
   \Drupal::formBuilder()->setErrorByName($name, $form_state, $message);
@@ -383,7 +391,7 @@ function form_clear_error(array &$form_state) {
  * @deprecated in Drupal 8.x-dev, will be removed before Drupal 8.0.
  *   Use \Drupal::formBuilder()->getErrors().
  *
- * @see \Drupal\Core\Form\FormBuilderInterface::getErrors().
+ * @see \Drupal\Core\Form\FormErrorInterface::getErrors()
  */
 function form_get_errors(array &$form_state) {
   return \Drupal::formBuilder()->getErrors($form_state);
@@ -395,7 +403,7 @@ function form_get_errors(array &$form_state) {
  * @deprecated in Drupal 8.x-dev, will be removed before Drupal 8.0.
  *   Use \Drupal::formBuilder()->getError().
  *
- * @see \Drupal\Core\Form\FormBuilderInterface::getError().
+ * @see \Drupal\Core\Form\FormErrorInterface::getError().
  */
 function form_get_error($element, array &$form_state) {
   return \Drupal::formBuilder()->getError($element, $form_state);
@@ -407,7 +415,7 @@ function form_get_error($element, array &$form_state) {
  * @deprecated in Drupal 8.x-dev, will be removed before Drupal 8.0.
  *   Use \Drupal::formBuilder()->setError().
  *
- * @see \Drupal\Core\Form\FormBuilderInterface::setError().
+ * @see \Drupal\Core\Form\FormErrorInterface::setError().
  */
 function form_error(&$element, array &$form_state, $message = '') {
   \Drupal::formBuilder()->setError($element, $form_state, $message);
@@ -844,12 +852,10 @@ function form_set_value($element, $value, &$form_state) {
  *   An array with all hierarchical elements flattened to a single array.
  *
  * @deprecated in Drupal 8.x-dev, will be removed before Drupal 8.0.
- *   Use \Drupal::formBuilder()->flattenOptions().
- *
- * @see \Drupal\Core\Form\FormBuilderInterface::flattenOptions().
+ *   Use \Drupal\Core\Form\OptGroup::flattenOptions().
  */
 function form_options_flatten($array) {
-  return \Drupal::formBuilder()->flattenOptions($array);
+  return OptGroup::flattenOptions($array);
 }
 
 /**

core/lib/Drupal/Core/Form/FormBuilderInterface.php

@@ -7,8 +7,6 @@
 
 namespace Drupal\Core\Form;
 
-use Symfony\Component\HttpFoundation\Request;
-
 /**
  * Provides an interface for form building and processing.
  */
@@ -387,33 +385,6 @@ public function processForm($form_id, &$form, &$form_state);
    */
   public function prepareForm($form_id, &$form, &$form_state);
 
-  /**
-   * Validates user-submitted form data in the $form_state array.
-   *
-   * @param $form_id
-   *   A unique string identifying the form for validation, submission,
-   *   theming, and hook_form_alter functions.
-   * @param $form
-   *   An associative array containing the structure of the form, which is
-   *   passed by reference. Form validation handlers are able to alter the form
-   *   structure (like #process and #after_build callbacks during form building)
-   *   in case of a validation error. If a validation handler alters the form
-   *   structure, it is responsible for validating the values of changed form
-   *   elements in $form_state['values'] to prevent form submit handlers from
-   *   receiving unvalidated values.
-   * @param $form_state
-   *   A keyed array containing the current state of the form. The current
-   *   user-submitted data is stored in $form_state['values'], though
-   *   form validation functions are passed an explicit copy of the
-   *   values for the sake of simplicity. Validation handlers can also use
-   *   $form_state to pass information on to submit handlers. For example:
-   *     $form_state['data_for_submission'] = $data;
-   *   This technique is useful when validation requires file parsing,
-   *   web service requests, or other expensive requests that should
-   *   not be repeated in the submission step.
-   */
-  public function validateForm($form_id, &$form, &$form_state);
-
   /**
    * Redirects the user to a URL after a form has been processed.
    *
@@ -477,14 +448,11 @@ public function validateForm($form_id, &$form, &$form_state);
   public function redirectForm($form_state);
 
   /**
-   * Executes custom validation and submission handlers for a given form.
+   * Executes custom submission handlers for a given form.
    *
    * Button-specific handlers are checked first. If none exist, the function
    * falls back to form-level handlers.
    *
-   * @param $type
-   *   The type of handler to execute. 'validate' or 'submit' are the
-   *   defaults used by Form API.
    * @param $form
    *   An associative array containing the structure of the form.
    * @param $form_state
@@ -492,7 +460,7 @@ public function redirectForm($form_state);
    *   submitted the form by clicking a button with custom handler functions
    *   defined, those handlers will be stored here.
    */
-  public function executeHandlers($type, &$form, &$form_state);
+  public function executeSubmitHandlers(&$form, &$form_state);
 
   /**
    * Builds and processes all elements in the structured form array.
@@ -620,19 +588,4 @@ public function doBuildForm($form_id, &$element, &$form_state);
    */
   public function setValue($element, $value, &$form_state);
 
-  /**
-   * Allows PHP array processing of multiple select options with the same value.
-   *
-   * Used for form select elements which need to validate HTML option groups
-   * and multiple options which may return the same value. Associative PHP
-   * arrays cannot handle these structures, since they share a common key.
-   *
-   * @param array $array
-   *   The form options array to process.
-   *
-   * @return array
-   *   An array with all hierarchical elements flattened to a single array.
-   */
-  public function flattenOptions(array $array);
-
 }

core/lib/Drupal/Core/Form/FormValidatorInterface.php

+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Core\Form\FormValidatorInterface.
+ */
+
+namespace Drupal\Core\Form;
+
+/**
+ * Provides an interface for validating form submissions.
+ */
+interface FormValidatorInterface extends FormErrorInterface {
+
+  /**
+   * Executes custom validation handlers for a given form.
+   *
+   * Button-specific handlers are checked first. If none exist, the function
+   * falls back to form-level handlers.
+   *
+   * @param $form
+   *   An associative array containing the structure of the form.
+   * @param $form_state
+   *   A keyed array containing the current state of the form. If the user
+   *   submitted the form by clicking a button with custom handler functions
+   *   defined, those handlers will be stored here.
+   */
+  public function executeValidateHandlers(&$form, &$form_state);
+
+  /**
+   * Validates user-submitted form data in the $form_state array.
+   *
+   * @param $form_id
+   *   A unique string identifying the form for validation, submission,
+   *   theming, and hook_form_alter functions.
+   * @param $form
+   *   An associative array containing the structure of the form, which is
+   *   passed by reference. Form validation handlers are able to alter the form
+   *   structure (like #process and #after_build callbacks during form building)
+   *   in case of a validation error. If a validation handler alters the form
+   *   structure, it is responsible for validating the values of changed form
+   *   elements in $form_state['values'] to prevent form submit handlers from
+   *   receiving unvalidated values.
+   * @param $form_state
+   *   A keyed array containing the current state of the form. The current
+   *   user-submitted data is stored in $form_state['values'], though
+   *   form validation functions are passed an explicit copy of the
+   *   values for the sake of simplicity. Validation handlers can also use
+   *   $form_state to pass information on to submit handlers. For example:
+   *     $form_state['data_for_submission'] = $data;
+   *   This technique is useful when validation requires file parsing,
+   *   web service requests, or other expensive requests that should
+   *   not be repeated in the submission step.
+   */
+  public function validateForm($form_id, &$form, &$form_state);
+
+}

core/lib/Drupal/Core/Form/OptGroup.php

+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Core\Form\OptGroup.
+ */
+
+namespace Drupal\Core\Form;
+
+/**
+ * Provides helpers for HTML option groups.
+ */
+class OptGroup {
+
+  /**
+   * Allows PHP array processing of multiple select options with the same value.
+   *
+   * Used for form select elements which need to validate HTML option groups
+   * and multiple options which may return the same value. Associative PHP
+   * arrays cannot handle these structures, since they share a common key.
+   *
+   * @param array $array
+   *   The form options array to process.
+   *
+   * @return array
+   *   An array with all hierarchical elements flattened to a single array.
+   */
+  public static function flattenOptions(array $array) {
+    $options = array();
+    static::doFlattenOptions($array, $options);
+    return $options;
+  }
+
+  /**
+   * Iterates over an array building a flat array with duplicate keys removed.
+   *
+   * This function also handles cases where objects are passed as array values.
+   *
+   * @param array $array
+   *   The form options array to process.
+   * @param array $options
+   *   The array of flattened options.
+   */
+  protected static function doFlattenOptions(array $array, array &$options) {
+    foreach ($array as $key => $value) {
+      if (is_object($value)) {
+        static::doFlattenOptions($value->option, $options);
+      }
+      elseif (is_array($value)) {
+        static::doFlattenOptions($value, $options);
+      }
+      else {
+        $options[$key] = 1;
+      }
+    }
+  }
+
+}

core/modules/entity_reference/lib/Drupal/entity_reference/ConfigurableEntityReferenceItem.php

@@ -10,6 +10,7 @@
 use Drupal\Component\Utility\String;
 use Drupal\Core\Field\FieldStorageDefinitionInterface;
 use Drupal\Core\Field\Plugin\Field\FieldType\EntityReferenceItem;
+use Drupal\Core\Form\OptGroup;
 use Drupal\Core\Session\AccountInterface;
 use Drupal\Core\TypedData\AllowedValuesInterface;
 use Drupal\Core\TypedData\DataDefinition;
@@ -69,7 +70,7 @@ public function getPossibleOptions(AccountInterface $account = NULL) {
   public function getSettableValues(AccountInterface $account = NULL) {
     // Flatten options first, because "settable options" may contain group
     // arrays.
-    $flatten_options = \Drupal::formBuilder()->flattenOptions($this->getSettableOptions($account));
+    $flatten_options = OptGroup::flattenOptions($this->getSettableOptions($account));
     return array_keys($flatten_options);
   }
 

core/modules/options/lib/Drupal/options/Plugin/Field/FieldType/ListItemBase.php

@@ -8,6 +8,7 @@
 namespace Drupal\options\Plugin\Field\FieldType;
 
 use Drupal\Core\Field\FieldItemBase;
+use Drupal\Core\Form\OptGroup;
 use Drupal\Core\Session\AccountInterface;
 use Drupal\Core\TypedData\AllowedValuesInterface;
 
@@ -32,7 +33,7 @@ public static function defaultSettings() {
   public function getPossibleValues(AccountInterface $account = NULL) {
     // Flatten options firstly, because Possible Options may contain group
     // arrays.
-    $flatten_options = \Drupal::formBuilder()->flattenOptions($this->getPossibleOptions($account));
+    $flatten_options = OptGroup::flattenOptions($this->getPossibleOptions($account));
     return array_keys($flatten_options);
   }
 
@@ -49,7 +50,7 @@ public function getPossibleOptions(AccountInterface $account = NULL) {
   public function getSettableValues(AccountInterface $account = NULL) {
     // Flatten options firstly, because Settable Options may contain group
     // arrays.
-    $flatten_options = \Drupal::formBuilder()->flattenOptions($this->getSettableOptions($account));
+    $flatten_options = OptGroup::flattenOptions($this->getSettableOptions($account));
     return array_keys($flatten_options);
   }
 

core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/Field/FieldType/TaxonomyTermReferenceItem.php

@@ -9,6 +9,7 @@
 
 use Drupal\Core\Field\FieldStorageDefinitionInterface;
 use Drupal\Core\Field\Plugin\Field\FieldType\EntityReferenceItem;
+use Drupal\Core\Form\OptGroup;
 use Drupal\Core\Session\AccountInterface;
 use Drupal\Core\TypedData\AllowedValuesInterface;
 
@@ -48,7 +49,7 @@ public static function defaultSettings() {
   public function getPossibleValues(AccountInterface $account = NULL) {
     // Flatten options firstly, because Possible Options may contain group
     // arrays.
-    $flatten_options = \Drupal::formBuilder()->flattenOptions($this->getPossibleOptions($account));
+    $flatten_options = OptGroup::flattenOptions($this->getPossibleOptions($account));
     return array_keys($flatten_options);
   }
 
@@ -65,7 +66,7 @@ public function getPossibleOptions(AccountInterface $account = NULL) {
   public function getSettableValues(AccountInterface $account = NULL) {
     // Flatten options firstly, because Settable Options may contain group
     // arrays.
-    $flatten_options = \Drupal::formBuilder()->flattenOptions($this->getSettableOptions($account));
+    $flatten_options = OptGroup::flattenOptions($this->getSettableOptions($account));
     return array_keys($flatten_options);
   }
 

core/tests/Drupal/Tests/Core/Form/FormBuilderTest.php

@@ -9,6 +9,7 @@
 
 use Drupal\Core\DependencyInjection\ContainerBuilder;
 use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
+use Drupal\Core\Form\OptGroup;
 use Drupal\Core\Form\FormInterface;
 use Drupal\Core\Url;
 use Symfony\Component\DependencyInjection\ContainerInterface;
@@ -220,34 +221,6 @@ public function testHandleRedirectWithResponse() {
     $this->assertSame($response, $form_state['response']);
   }
 
-  /**
-   * Tests that form errors during submission throw an exception.
-   *
-   * @covers ::setErrorByName
-   *
-   * @expectedException \LogicException
-   * @expectedExceptionMessage Form errors cannot be set after form validation has finished.
-   */
-  public function testFormErrorsDuringSubmission() {
-    $form_id = 'test_form_id';
-    $expected_form = $form_id();
-
-    $form_arg = $this->getMockForm($form_id, $expected_form);
-    $form_builder = $this->formBuilder;
-    $form_arg->expects($this->any())
-      ->method('submitForm')
-      ->will($this->returnCallback(function ($form, &$form_state) use ($form_builder) {
-        $form_builder->setErrorByName('test', $form_state, 'Hello');
-      }));
-
-    $form_state = array();
-    $this->formBuilder->getFormId($form_arg, $form_state);
-
-    $form_state['values'] = array();
-    $form_state['input']['form_id'] = $form_id;
-    $this->simulateFormSubmission($form_id, $form_arg, $form_state, FALSE);
-  }
-
   /**
    * Tests the redirectForm() method when a redirect is expected.
    *
@@ -499,124 +472,13 @@ public function testRebuildForm() {
     $this->assertNotSame($original_build_id, $form['#build_id']);
   }
 
-  /**
-   * Tests the submitForm() method.
-   */
-  public function testSubmitForm() {
-    $form_id = 'test_form_id';
-    $expected_form = $form_id();
-    $expected_form['test']['#required'] = TRUE;
-    $expected_form['options']['#required'] = TRUE;
-    $expected_form['value']['#required'] = TRUE;
-
-    $form_arg = $this->getMock('Drupal\Core\Form\FormInterface');
-    $form_arg->expects($this->exactly(5))
-      ->method('getFormId')
-      ->will($this->returnValue($form_id));
-    $form_arg->expects($this->exactly(5))
-      ->method('buildForm')
-      ->will($this->returnValue($expected_form));
-
-    $form_state = array();
-    $form_state['values']['test'] = $this->randomName();
-    $form_state['values']['op'] = 'Submit';
-    $this->formBuilder->submitForm($form_arg, $form_state);
-    $errors = $this->formBuilder->getErrors($form_state);
-    $this->assertNotEmpty($errors['options']);
-
-    $form_state = array();
-    $form_state['values']['test'] = $this->randomName();
-    $form_state['values']['options'] = 'foo';
-    $form_state['values']['op'] = 'Submit';
-    $this->formBuilder->submitForm($form_arg, $form_state);
-    $errors = $this->formBuilder->getErrors($form_state);
-    $this->assertEmpty($errors);
-
-    $form_state = array();
-    $form_state['values']['test'] = $this->randomName();
-    $form_state['values']['options'] = array('foo');
-    $form_state['values']['op'] = 'Submit';
-    $this->formBuilder->submitForm($form_arg, $form_state);
-    $errors = $this->formBuilder->getErrors($form_state);
-    $this->assertEmpty($errors);
-
-    $form_state = array();
-    $form_state['values']['test'] = $this->randomName();
-    $form_state['values']['options'] = array('foo', 'baz');
-    $form_state['values']['op'] = 'Submit';
-    $this->formBuilder->submitForm($form_arg, $form_state);
-    $errors = $this->formBuilder->getErrors($form_state);
-    $this->assertNotEmpty($errors['options']);
-
-    $form_state = array();
-    $form_state['values']['test'] = $this->randomName();
-    $form_state['values']['options'] = $this->randomName();
-    $form_state['values']['op'] = 'Submit';
-    $this->formBuilder->submitForm($form_arg, $form_state);
-    $errors = $this->formBuilder->getErrors($form_state);
-    $this->assertNotEmpty($errors['options']);
-  }
-
-  /**
-   * Tests the 'must_validate' $form_state flag.
-   *
-   * @covers ::validateForm
-   */
-  public function testMustValidate() {
-    $form_id = 'test_form_id';
-    $expected_form = $form_id();
-
-    $form_arg = $this->getMock('Drupal\Core\Form\FormInterface');
-    $form_arg->expects($this->any())
-      ->method('getFormId')
-      ->will($this->returnValue($form_id));
-    $form_arg->expects($this->any())
-      ->method('buildForm')
-      ->will($this->returnValue($expected_form));
-    $form_builder = $this->formBuilder;
-    $form_arg->expects($this->exactly(2))
-      ->method('validateForm')
-      ->will($this->returnCallback(function (&$form, &$form_state) use ($form_builder) {
-        $form_builder->setErrorByName('test', $form_state, 'foo');
-      }));
-
-    $form_state = array();
-    // This submission will trigger validation.
-    $this->simulateFormSubmission($form_id, $form_arg, $form_state);
-    $errors = $this->formBuilder->getErrors($form_state);
-    $this->assertNotEmpty($errors['test']);
-
-    // This submission will not re-trigger validation.
-    $this->simulateFormSubmission($form_id, $form_arg, $form_state);
-    $errors = $this->formBuilder->getErrors($form_state);
-    $this->assertNotEmpty($errors['test']);
-
-    // The must_validate flag will re-trigger validation.
-    $form_state['must_validate'] = TRUE;
-    $this->simulateFormSubmission($form_id, $form_arg, $form_state);
-    $errors = $this->formBuilder->getErrors($form_state);
-    $this->assertNotEmpty($errors['test']);
-  }
-
   /**
    * Tests the flattenOptions() method.
    *
    * @dataProvider providerTestFlattenOptions
    */
   public function testFlattenOptions($options) {
-    $form_id = 'test_form_id';
-    $expected_form = $form_id();
-    $expected_form['select']['#required'] = TRUE;
-    $expected_form['select']['#options'] = $options;
-
-    $form_arg = $this->getMockForm($form_id, $expected_form);
-
-    $form_state = array();
-    $form_state['values']['select'] = 'foo';
-    $form_state['values']['op'] = 'Submit';
-    $this->formBuilder->submitForm($form_arg, $form_state);
-    $errors = $this->formBuilder->getErrors($form_state);
-    $this->assertEmpty($errors);
+    $this->assertSame(array('foo' => 1), OptGroup::flattenOptions($options));
   }
 
   /**
@@ -625,100 +487,15 @@ public function testFlattenOptions($options) {
    * @return array
    */
   public function providerTestFlattenOptions() {
-    $object = new \stdClass();
-    $object->option = array('foo' => 'foo');
+    $object1 = new \stdClass();
+    $object1->option = array('foo' => 'foo');
+    $object2 = new \stdClass();
+    $object2->option = array(array('foo' => 'foo'), array('foo' => 'foo'));
     return array(
       array(array('foo' => 'foo')),
       array(array(array('foo' => 'foo'))),
-      array(array($object)),
-    );
-  }
-
-  /**
-   * Tests the setErrorByName() method.
-   *
-   * @param array|null $limit_validation_errors
-   *   The errors to limit validation for, NULL will run all validation.
-   * @param array $expected_errors
-   *   The errors expected to be set.
-   *
-   * @dataProvider providerTestSetErrorByName
-   */
-  public function testSetErrorByName($limit_validation_errors, $expected_errors) {
-    $form_id = 'test_form_id';
-    $expected_form = $form_id();
-    $expected_form['actions']['submit']['#submit'][] = 'test_form_id_custom_submit';
-    $expected_form['actions']['submit']['#limit_validation_errors'] = $limit_validation_errors;
-
-    $form_arg = $this->getMockForm($form_id, $expected_form);
-    $form_builder = $this->formBuilder;
-    $form_arg->expects($this->once())
-      ->method('validateForm')
-      ->will($this->returnCallback(function (array &$form, array &$form_state) use ($form_builder) {
-        $form_builder->setErrorByName('test', $form_state, 'Fail 1');
-        $form_builder->setErrorByName('test', $form_state, 'Fail 2');
-        $form_builder->setErrorByName('options', $form_state);
-      }));
-
-    $form_state = array();
-    $form_state['values']['test'] = $this->randomName();
-    $form_state['values']['options'] = 'foo';
-    $form_state['values']['op'] = 'Submit';
-    $this->formBuilder->submitForm($form_arg, $form_state);
-
-    $errors = $this->formBuilder->getErrors($form_state);
-    $this->assertSame($expected_errors, $errors);
-  }
-
-  /**
-   * Provides test data for testing the setErrorByName() method.
-   *
-   * @return array