1. 8.5.x core/lib/Drupal/Core/Form/ConfigFormBaseTrait.php ConfigFormBaseTrait
  2. 8.0.x core/lib/Drupal/Core/Form/ConfigFormBaseTrait.php ConfigFormBaseTrait
  3. 8.1.x core/lib/Drupal/Core/Form/ConfigFormBaseTrait.php ConfigFormBaseTrait
  4. 8.2.x core/lib/Drupal/Core/Form/ConfigFormBaseTrait.php ConfigFormBaseTrait
  5. 8.3.x core/lib/Drupal/Core/Form/ConfigFormBaseTrait.php ConfigFormBaseTrait
  6. 8.4.x core/lib/Drupal/Core/Form/ConfigFormBaseTrait.php ConfigFormBaseTrait
  7. 8.6.x core/lib/Drupal/Core/Form/ConfigFormBaseTrait.php ConfigFormBaseTrait

Provides access to configuration for forms.

This trait provides a config() method that returns override free and mutable config objects if the configuration name is in the array returned by the getEditableConfigNames() implementation.

Forms that present configuration to the user have to take care not to save configuration overrides to the stored configuration since overrides are often environment specific. Default values of form elements should be obtained from override free configuration objects. However, if a form reacts to configuration in any way, for example sends an email to the system.site:mail address, then it is important that the value comes from a configuration object with overrides. Therefore, override free and editable configuration objects are limited to those listed by the getEditableConfigNames() method.


5 files declare their use of ConfigFormBaseTrait
ContactFormEditForm.php in core/modules/contact/src/ContactFormEditForm.php
DefaultProcessor.php in core/modules/aggregator/src/Plugin/aggregator/processor/DefaultProcessor.php
NegotiationBrowserDeleteForm.php in core/modules/language/src/Form/NegotiationBrowserDeleteForm.php
SearchPageListBuilder.php in core/modules/search/src/SearchPageListBuilder.php
TestProcessor.php in core/modules/aggregator/tests/modules/aggregator_test/src/Plugin/aggregator/processor/TestProcessor.php


core/lib/Drupal/Core/Form/ConfigFormBaseTrait.php, line 23


View source
trait ConfigFormBaseTrait {

   * Retrieves a configuration object.
   * @param string $name
   *   The name of the configuration object to retrieve. The name corresponds to
   *   a configuration file. For @code \Drupal::config('book.admin') @endcode,
   *   the config object returned will contain the contents of book.admin
   *   configuration file.
   * @return \Drupal\Core\Config\Config|\Drupal\Core\Config\ImmutableConfig
   *   An editable configuration object if the given name is listed in the
   *   getEditableConfigNames() method or an immutable configuration object if
   *   not.
  protected function config($name) {

    /** @var \Drupal\Core\Config\ConfigFactoryInterface $config_factory */
    if (method_exists($this, 'configFactory')) {
      $config_factory = $this
    elseif (property_exists($this, 'configFactory')) {
      $config_factory = $this->configFactory;
    if (!isset($config_factory) || !$config_factory instanceof ConfigFactoryInterface) {
      throw new \LogicException('No config factory available for ConfigFormBaseTrait');
    if (in_array($name, $this
      ->getEditableConfigNames())) {

      // Get a mutable object from the factory.
      $config = $config_factory
    else {
      $config = $config_factory
    return $config;

   * Gets the configuration names that will be editable.
   * @return array
   *   An array of configuration object names that are editable if called in
   *   conjunction with the trait's config() method.
  protected abstract function getEditableConfigNames();



Contains filters are case sensitive
Namesort descending Modifiers Type Description Overrides
ConfigFormBaseTrait::config protected function Retrieves a configuration object.
ConfigFormBaseTrait::getEditableConfigNames abstract protected function Gets the configuration names that will be editable.