Issue #2015687 by smiletrl, amateescu, Berdir, fago: Convert field type to...

Issue #2015687 by smiletrl, amateescu, Berdir, fago: Convert field type to FieldType plugin for taxonomy module.

core/lib/Drupal/Core/Field/ConfigEntityReferenceItemBase.php

@@ -8,80 +8,14 @@
 namespace Drupal\Core\Field;
 
 use Drupal\Core\Field\Plugin\Field\FieldType\EntityReferenceItem;
-use Drupal\Core\TypedData\DataDefinition;
-use Drupal\field\FieldInstanceInterface;
-use Drupal\field\FieldInterface;
 
 /**
  * A common base class for configurable entity reference fields.
  *
- * Extends the Core 'entity_reference' entity field item with properties for
- * revision ids, labels (for autocreate) and access.
- *
- * Required settings (below the definition's 'settings' key) are:
- *  - target_type: The entity type to reference.
+ * Extends the Core 'entity_reference' entity field item with common methods
+ * used in general configurable entity reference field.
  */
-class ConfigEntityReferenceItemBase extends EntityReferenceItem implements ConfigFieldItemInterface {
-
-  /**
-   * Definitions of the contained properties.
-   *
-   * @see ConfigurableEntityReferenceItem::getPropertyDefinitions()
-   *
-   * @var array
-   */
-  static $propertyDefinitions;
-
-  /**
-   * {@inheritdoc}
-   */
-  public function getPropertyDefinitions() {
-    $settings = $this->definition->getSettings();
-    $target_type = $settings['target_type'];
-
-    // Definitions vary by entity type and bundle, so key them accordingly.
-    $key = $target_type . ':';
-    $key .= isset($settings['target_bundle']) ? $settings['target_bundle'] : '';
-
-    if (!isset(static::$propertyDefinitions[$key])) {
-      // Call the parent to define the target_id and entity properties.
-      parent::getPropertyDefinitions();
-
-      // Only add the revision ID property if the target entity type supports
-      // revisions.
-      $target_type_info = \Drupal::entityManager()->getDefinition($target_type);
-      if (!empty($target_type_info['entity_keys']['revision']) && !empty($target_type_info['revision_table'])) {
-        static::$propertyDefinitions[$key]['revision_id'] = DataDefinition::create('integer')
-          ->setLabel(t('Revision ID'))
-          ->setConstraints(array('Range' => array('min' => 0)));
-      }
-
-      static::$propertyDefinitions[$key]['label'] = DataDefinition::create('string')
-        ->setLabel(t('Label (auto-create)'))
-        ->setComputed(TRUE);
-
-      static::$propertyDefinitions[$key]['access'] = DataDefinition::create('boolean')
-        ->setLabel(t('Access'))
-        ->setComputed(TRUE);
-    }
-    return static::$propertyDefinitions[$key];
-  }
-
-  /**
-   * {@inheritdoc}
-   *
-   * Copied from \Drupal\field\Plugin\Field\FieldType\LegacyConfigFieldItem,
-   * since we cannot extend it.
-   */
-  public static function schema(FieldInterface $field) {
-    $definition = \Drupal::service('plugin.manager.field.field_type')->getDefinition($field->type);
-    $module = $definition['provider'];
-    module_load_install($module);
-    $callback = "{$module}_field_schema";
-    if (function_exists($callback)) {
-      return $callback($field);
-    }
-  }
+class ConfigEntityReferenceItemBase extends EntityReferenceItem {
 
   /**
    * {@inheritdoc}
@@ -101,75 +35,14 @@ public function isEmpty() {
 
   /**
    * {@inheritdoc}
-   *
-   * Copied from \Drupal\field\Plugin\Field\FieldType\LegacyConfigFieldItem,
-   * since we cannot extend it.
-   */
-  public function settingsForm(array $form, array &$form_state, $has_data) {
-    if ($callback = $this->getLegacyCallback('settings_form')) {
-      $instance = $this->getFieldDefinition();
-      if (!($instance instanceof FieldInstanceInterface)) {
-        throw new \UnexpectedValueException('ConfigEntityReferenceItemBase::settingsForm() called for a field whose definition is not a field instance.');
-      }
-      // hook_field_settings_form() used to receive the $instance (not actually
-      // needed), and the value of field_has_data().
-      return $callback($instance->getField(), $instance, $has_data);
-    }
-    return array();
-  }
-
-  /**
-   * {@inheritdoc}
-   *
-   * Copied from \Drupal\field\Plugin\Field\FieldType\LegacyConfigFieldItem,
-   * since we cannot extend it.
    */
-  public function instanceSettingsForm(array $form, array &$form_state) {
-    if ($callback = $this->getLegacyCallback('instance_settings_form')) {
-      $instance = $this->getFieldDefinition();
-      if (!($instance instanceof FieldInstanceInterface)) {
-        throw new \UnexpectedValueException('ConfigEntityReferenceItemBase::instanceSettingsForm() called for a field whose definition is not a field instance.');
-      }
-      return $callback($instance->getField(), $instance, $form_state);
-    }
-    return array();
-  }
+  public function preSave() {
+    $entity = $this->get('entity')->getValue();
+    $target_id = $this->get('target_id')->getValue();
 
-  /**
-   * Returns options provided via the legacy callback hook_options_list().
-   *
-   * @todo: Convert all legacy callback implementations to methods.
-   *
-   * @see \Drupal\Core\TypedData\AllowedValuesInterface
-   */
-  public function getSettableOptions() {
-    $definition = $this->getPluginDefinition();
-    $callback = "{$definition['provider']}_options_list";
-    if (function_exists($callback)) {
-      // We are at the field item level, so we need to go two levels up to get
-      // to the entity object.
-      return $callback($this->getFieldDefinition(), $this->getEntity());
-    }
-  }
-
-  /**
-   * Returns the legacy callback for a given field type "hook".
-   *
-   * Copied from \Drupal\field\Plugin\Field\FieldType\LegacyConfigFieldItem,
-   * since we cannot extend it.
-   *
-   * @param string $hook
-   *   The name of the hook, e.g. 'settings_form', 'is_empty'.
-   *
-   * @return string|null
-   *   The name of the legacy callback, or NULL if it does not exist.
-   */
-  protected function getLegacyCallback($hook) {
-    $definition = $this->getPluginDefinition();
-    $module = $definition['provider'];
-    $callback = "{$module}_field_{$hook}";
-    if (function_exists($callback)) {
-      return $callback;
+    if (!$target_id && !empty($entity) && $entity->isNew()) {
+      $entity->save();
+      $this->set('target_id', $entity->id());
     }
   }
 

core/lib/Drupal/Core/Field/FieldItemBase.php

@@ -211,4 +211,11 @@ public function delete() { }
    */
   public function deleteRevision() { }
 
+  /**
+   * {@inheritdoc}
+   */
+  public function getMainPropertyName() {
+    return 'value';
+  }
+
 }

core/lib/Drupal/Core/Field/FieldItemInterface.php

@@ -136,4 +136,20 @@ public function delete();
    */
   public function deleteRevision();
 
+  /**
+   * Returns the name of the main property, if any.
+   *
+   * Some field items consist mainly of one main property, e.g. the value of a
+   * text field or the @code target_id @endcode of an entity reference. If the
+   * field item has no main property, the method returns NULL.
+   *
+   * @return string|null
+   *   The name of the value property, or NULL if there is none.
+   *
+   * @todo: Move this to ComplexDataInterface once we improved Typed data to do
+   *   not enforce having all methods on the data objects.
+   *   https://drupal.org/node/2002134
+   */
+  public function getMainPropertyName();
+
 }

core/lib/Drupal/Core/Field/Plugin/Field/FieldType/EntityReferenceItem.php

@@ -141,4 +141,12 @@ public function onChange($property_name) {
     }
     parent::onChange($property_name);
   }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getMainPropertyName() {
+    return 'target_id';
+  }
+
 }

core/lib/Drupal/Core/TypedData/AllowedValuesInterface.php

@@ -24,6 +24,11 @@
  * as structured options arrays that can be used in an Options widget such as a
  * select box or checkboxes.
  *
+ * Note that this interface is mostly applicable for primitive data values, but
+ * can be used on complex data structures if a (primitive) main property is
+ * specified. In that case, the allowed values and options apply to the main
+ * property only.
+ *
  * @see \Drupal\options\Plugin\Field\FieldWidget\OptionsWidgetBase
  */
 interface AllowedValuesInterface {

core/lib/Drupal/Core/TypedData/TypedDataManager.php

@@ -362,7 +362,7 @@ public function getConstraints(DataDefinitionInterface $definition) {
       $class = $type_definition['class'];
     }
     // Check if the class provides allowed values.
-    if (array_key_exists('Drupal\Core\TypedData\AllowedValuesInterface', class_implements($class))) {
+    if (is_subclass_of($class,'Drupal\Core\TypedData\AllowedValuesInterface')) {
       $constraints[] = $validation_manager->create('AllowedValues', array());
     }
 

core/lib/Drupal/Core/Validation/Plugin/Validation/Constraint/AllowedValuesConstraintValidator.php

@@ -8,6 +8,7 @@
 namespace Drupal\Core\Validation\Plugin\Validation\Constraint;
 
 use Drupal\Core\TypedData\AllowedValuesInterface;
+use Drupal\Core\TypedData\ComplexDataInterface;
 use Symfony\Component\Validator\Constraint;
 use Symfony\Component\Validator\Constraints\ChoiceValidator;
 
@@ -20,14 +21,32 @@ class AllowedValuesConstraintValidator extends ChoiceValidator {
    * {@inheritdoc}
    */
   public function validate($value, Constraint $constraint) {
-    if (!isset($value)) {
-      return;
-    }
-    if ($this->context->getMetadata()->getTypedData() instanceof AllowedValuesInterface) {
+    $typed_data = $this->context->getMetadata()->getTypedData();
+
+    if ($typed_data instanceof AllowedValuesInterface) {
       $account = \Drupal::currentUser();
-      $allowed_values = $this->context->getMetadata()->getTypedData()->getSettableValues($account);
+      $allowed_values = $typed_data->getSettableValues($account);
       $constraint->choices = $allowed_values;
+
+      // If the data is complex, we have to validate its main property.
+      if ($typed_data instanceof ComplexDataInterface) {
+        $name = $typed_data->getMainPropertyName();
+        if (!isset($name)) {
+          throw new \LogicException('Cannot validate allowed values for complex data without a main property.');
+        }
+        $value = $typed_data->get($name)->getValue();
+      }
     }
-    return parent::validate($value, $constraint);
+
+    // The parent implementation ignores values that are not set, but makes
+    // sure some choices are available firstly. However, we want to support
+    // empty choices for undefined values, e.g. if a term reference field
+    // points to an empty vocabulary.
+    if (!isset($value)) {
+      return;
+    }
+
+    parent::validate($value, $constraint);
   }
+
 }

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

@@ -7,6 +7,7 @@
 
 namespace Drupal\entity_reference;
 
+use Drupal\Core\TypedData\DataDefinition;
 use Drupal\field\FieldInterface;
 use Drupal\Core\Field\ConfigEntityReferenceItemBase;
 use Drupal\Core\Field\ConfigFieldItemInterface;
@@ -17,11 +18,51 @@
  * Replaces the Core 'entity_reference' entity field type implementation, this
  * supports configurable fields, auto-creation of referenced entities and more.
  *
+ * Required settings (below the definition's 'settings' key) are:
+ *  - target_type: The entity type to reference.
+ *
  * @see entity_reference_field_info_alter().
  *
  */
 class ConfigurableEntityReferenceItem extends ConfigEntityReferenceItemBase implements ConfigFieldItemInterface {
 
+  /**
+   * Definitions of the contained properties.
+   *
+   * @see ConfigurableEntityReferenceItem::getPropertyDefinitions()
+   *
+   * @var array
+   */
+  static $propertyDefinitions;
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getPropertyDefinitions() {
+    $settings = $this->definition->getSettings();
+    $target_type = $settings['target_type'];
+
+    // Definitions vary by entity type and bundle, so key them accordingly.
+    $key = $target_type . ':';
+    $key .= isset($settings['target_bundle']) ? $settings['target_bundle'] : '';
+
+    if (!isset(static::$propertyDefinitions[$key])) {
+      // Call the parent to define the target_id and entity properties.
+      parent::getPropertyDefinitions();
+
+      // Only add the revision ID property if the target entity type supports
+      // revisions.
+      $target_type_info = \Drupal::entityManager()->getDefinition($target_type);
+      if (!empty($target_type_info['entity_keys']['revision']) && !empty($target_type_info['revision_table'])) {
+        static::$propertyDefinitions[$key]['revision_id'] = DataDefinition::create('integer')
+          ->setLabel(t('Revision ID'))
+          ->setConstraints(array('Range' => array('min' => 0)));
+      }
+    }
+
+    return static::$propertyDefinitions[$key];
+  }
+
   /**
    * {@inheritdoc}
    */
@@ -65,19 +106,6 @@ public static function schema(FieldInterface $field) {
     return $schema;
   }
 
-  /**
-   * {@inheritdoc}
-   */
-  public function preSave() {
-    $entity = $this->get('entity')->getValue();
-    $target_id = $this->get('target_id')->getValue();
-
-    if (!$target_id && !empty($entity) && $entity->isNew()) {
-      $entity->save();
-      $this->set('target_id', $entity->id());
-    }
-  }
-
   /**
    * {@inheritdoc}
    */

core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/Field/FieldFormatter/TaxonomyFormatterBase.php

@@ -27,7 +27,7 @@ public function prepareView(array $entities_items) {
     foreach ($entities_items as $items) {
       foreach ($items as $item) {
         // Force the array key to prevent duplicates.
-        if ($item->target_id !== 0) {
+        if ($item->target_id != NULL) {
           $tids[$item->target_id] = $item->target_id;
         }
       }
@@ -48,7 +48,7 @@ public function prepareView(array $entities_items) {
             $item->entity = $terms[$item->target_id];
           }
           // Terms to be created are not in $terms, but are still legitimate.
-          elseif ($item->target_id === 0 && isset($item->entity)) {
+          elseif ($item->target_id === NULL && isset($item->entity)) {
             // Leave the item in place.
           }
           // Otherwise, unset the instance value, since the term does not exist.

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

@@ -7,12 +7,12 @@
 
 namespace Drupal\taxonomy\Plugin\Field\FieldType;
 
-use Drupal\Core\Field\Plugin\Field\FieldType\LegacyConfigFieldItemList;
+use Drupal\Core\Field\ConfigFieldItemList;
 
 /**
- * Represents a configurable taxonomy_term_reference entity field.
+ * Represents a configurable taxonomy_term_reference entity field item list.
  */
-class TaxonomyTermReferenceFieldItemList extends LegacyConfigFieldItemList {
+class TaxonomyTermReferenceFieldItemList extends ConfigFieldItemList {
 
   /**
    * {@inheritdoc}

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

+<?php
+
+/**
+ * @file
+ * Contains \Drupal\taxonomy\Plugin\field\field_type\TaxonomyTermReferenceItem.
+ */
+
+namespace Drupal\taxonomy\Plugin\Field\FieldType;
+
+use Drupal\Core\Field\ConfigEntityReferenceItemBase;
+use Drupal\Core\Field\ConfigFieldItemInterface;
+use Drupal\field\FieldInterface;
+use Drupal\Core\Session\AccountInterface;
+use Drupal\Core\TypedData\AllowedValuesInterface;
+use Drupal\Core\Field\FieldDefinitionInterface;
+use Drupal\Core\Entity\EntityInterface;
+
+/**
+ * Plugin implementation of the 'term_reference' field type.
+ *
+ * @FieldType(
+ *   id = "taxonomy_term_reference",
+ *   label = @Translation("Term Reference"),
+ *   description = @Translation("This field stores a reference to a taxonomy term."),
+ *   settings = {
+ *     "options_list_callback" = NULL,
+ *     "allowed_values" = {
+ *       {
+ *         "vocabulary" = "",
+ *         "parent" = "0"
+ *       }
+ *     }
+ *   },
+ *   instance_settings = { },
+ *   default_widget = "options_select",
+ *   default_formatter = "taxonomy_term_reference_link",
+ *   list_class = "\Drupal\taxonomy\Plugin\Field\FieldType\TaxonomyTermReferenceFieldItemList"
+ * )
+ */
+class TaxonomyTermReferenceItem extends ConfigEntityReferenceItemBase implements ConfigFieldItemInterface, AllowedValuesInterface {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getPossibleValues(AccountInterface $account = NULL) {
+    // Flatten options firstly, because Possible Options may contain group
+    // arrays.
+    $flatten_options = $this->flattenOptions($this->getPossibleOptions($account));
+    return array_keys($flatten_options);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getPossibleOptions(AccountInterface $account = NULL) {
+    return $this->getSettableOptions($account);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getSettableValues(AccountInterface $account = NULL) {
+   // Flatten options firstly, because Settable Options may contain group
+   // arrays.
+    $flatten_options = $this->flattenOptions($this->getSettableOptions($account));
+    return array_keys($flatten_options);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getSettableOptions(AccountInterface $account = NULL) {
+    $instance = $this->getFieldDefinition();
+    $entity = $this->getParent()->getParent();
+    $function = $this->getFieldSetting('options_list_callback') ? $this->getFieldSetting('options_list_callback') : array($this, 'getDefaultOptions');
+    return call_user_func_array($function, array($instance, $entity));
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getPropertyDefinitions() {
+    $this->definition['settings']['target_type'] = 'taxonomy_term';
+    return parent::getPropertyDefinitions();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function schema(FieldInterface $field) {
+    return array(
+      'columns' => array(
+        'target_id' => array(
+          'type' => 'int',
+          'unsigned' => TRUE,
+          'not null' => FALSE,
+        ),
+      ),
+      'indexes' => array(
+        'target_id' => array('target_id'),
+      ),
+      'foreign keys' => array(
+        'target_id' => array(
+          'table' => 'taxonomy_term_data',
+          'columns' => array('target_id' => 'tid'),
+        ),
+      ),
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function settingsForm(array $form, array &$form_state, $has_data) {
+    // Get proper values for 'allowed_values_function', which is a core setting.
+    $vocabularies = entity_load_multiple('taxonomy_vocabulary');
+    $options = array();
+    foreach ($vocabularies as $vocabulary) {
+      $options[$vocabulary->id()] = $vocabulary->name;
+    }
+
+    $settings = $this->getFieldSettings();
+    $element = array();
+    $element['#tree'] = TRUE;
+
+    foreach ($settings['allowed_values'] as $delta => $tree) {
+      $element['allowed_values'][$delta]['vocabulary'] = array(
+        '#type' => 'select',
+        '#title' => t('Vocabulary'),
+        '#default_value' => $tree['vocabulary'],
+        '#options' => $options,
+        '#required' => TRUE,
+        '#description' => t('The vocabulary which supplies the options for this field.'),
+        '#disabled' => $has_data,
+      );
+      $element['allowed_values'][$delta]['parent'] = array(
+        '#type' => 'value',
+        '#value' => $tree['parent'],
+      );
+    }
+
+    return $element;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function instanceSettingsForm(array $form, array &$form_state) {
+    return array();
+  }
+
+  /**
+  * Flattens an array of allowed values.
+  *
+  * @todo Define this function somewhere else, so we don't have to redefine it
+  *   when other field type classes, e.g. list option, need it too.
+  *   https://drupal.org/node/2138803
+  *
+  * @param array $array
+  *   A single or multidimensional array.
+  *
+  * @return array
+  *   The flattened array.
+  */
+  protected function flattenOptions(array $array) {
+    $result = array();
+    array_walk_recursive($array, function($a, $b) use (&$result) { $result[$b] = $a; });
+    return $result;
+  }
+
+  /**
+   * Returns default set of valid terms for a taxonomy field.
+   *
+   * Contrib code could make use of field setting's "options_list_callback" to
+   * provide custom options for taxonomy term reference field.
+   *
+   * @param \Drupal\Core\Field\FieldDefinitionInterface $field_definition
+   *   The field definition.
+   * @param \Drupal\Core\Entity\EntityInterface $entity
+   *   The entity object the field is attached to.
+   *