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reference.module
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reference.module
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<?php
/**
* @file
* Defines a field type for referencing other entites.
*/
/**
* Implements hook_entity_info_alter().
*
* TO DO: Patch core entities to have each provide its own values.
*/
function reference_entity_info_alter(&$entity_info) {
$entity_info['comment']['entity keys']['label'] = 'subject';
$entity_info['comment']['entity keys']['status'] = 'status';
$entity_info['file']['entity keys']['label'] = 'filename';
$entity_info['file']['entity keys']['status'] = 'status';
$entity_info['node']['entity keys']['label'] = 'title';
$entity_info['node']['entity keys']['status'] = 'status';
$entity_info['taxonomy_term']['entity keys']['label'] = 'name';
$entity_info['user']['entity keys']['label'] = 'name';
$entity_info['user']['entity keys']['status'] = 'status';
}
/**
* Implements hook_field_info() to define the reference field.
*/
function reference_field_info() {
return array(
'reference' => array(
'label' => t('Reference'),
'description' => t('Defines a field type for referencing other entities.'),
'settings' => array(
'entity_type' => 'node',
),
'instance_settings' => array(
'bundles' => array(),
'status' => '',
),
'default_widget' => 'reference_autocomplete',
'default_formatter' => 'reference_link',
),
);
}
/**
* Implements hook_field_settings_form() for setting the field options.
*/
function reference_field_settings_form($field, $instance, $has_data) {
// Find all available entity types to allow one to be selected.
$entity_type_options = array();
foreach (entity_get_info() as $entity_type => $entity_type_info) {
// Ensure that the entity type has registered its label entity key.
if (isset($entity_type_info['entity keys']['label'])) {
$entity_type_options[$entity_type] = $entity_type_info['label'];
} else {
backdrop_set_message(t("The @entity entity type has not declared its label attribute and cannot be referenced.", array('@entity' => $entity_type_info['label'])), 'warning');
}
}
// Build the field settings form.
$form = array();
$form['entity_type'] = array(
'#type' => 'select',
'#title' => t('Select the type of content to be referenced.'),
'#options' => $entity_type_options,
'#default_value' => $field['settings']['entity_type'],
'#required' => TRUE,
'#disabled' => $has_data,
);
return $form;
}
/**
* Implements hook_field_instance_settings_form() for setting instance options.
*/
function reference_field_instance_settings_form($field, $instance) {
$entity_type_info = entity_get_info($field['settings']['entity_type']);
$form = array();
// Allow the reference options to be filtered by entity status.
$form['status'] = array(
'#type' => 'checkbox',
'#title' => t('Limit to published content'),
'#default_value' => $instance['settings']['status'],
);
// Ensure that the entity type has registered its status key in entity info .
if(!isset($entity_type_info['entity keys']['status']) || empty($entity_type_info['entity keys']['status'])) {
$form['status']['#disabled'] = true;
$form['status']['#description'] = t("Sorry, this entity type does not support limiting reference selection by status. <em>(no key for status found in entity info)</em>");
}
// Allow the reference options to be filtered by entity bundle.
$bundles_options = array();
foreach ($entity_type_info['bundles'] as $bundle => $bundle_info) {
$bundles_options[$bundle] = $bundle_info['label'];
}
$form['bundles'] = array(
'#type' => 'checkboxes',
'#title' => t('Limit selection by ' . ($entity_type_info['bundle label'] ? strtolower($entity_type_info['bundle label']) : 'type') . ' of ' . strtolower($entity_type_info['label'])),
'#options' => $bundles_options,
'#multiple' => TRUE,
'#default_value' => $instance['settings']['bundles'] ? $instance['settings']['bundles'] : array(),
'#description' => t('Leave unchecked to allow all types to be referenced.'),
);
// Ensure that the entity type has registered its bundle key in entity info.
if(!isset($entity_type_info['entity keys']['bundle']) || empty($entity_type_info['entity keys']['bundle'])) {
$form['bundles']['#options'] = array();
$form['bundles']['#description'] = t('Sorry, this entity type does not support limiting reference selection by bundle. <em>(no key for bundle found in entity info)</em>');
}
// Ensure that the entity type's bundle key matches a column in its base table.
if(!db_field_exists($entity_type_info['base table'], $entity_type_info['entity keys']['bundle'])) {
$form['bundles']['#options'] = array();
$form['bundles']['#description'] = t('Sorry, this entity type does not support limiting reference selection by bundle. <em>(bundle key in entity info not found in database table)</em>');
}
return $form;
}
/**
* Implements hook_field_is_empty() so forms know if a field is empty.
*/
function reference_field_is_empty($item, $field) {
return empty($item['target_id']);
}
/**
* Implements hook_field_validate() so forms know if a field value is valid.
*/
function reference_field_validate($entity_type, $entity, $field, $instance, $langcode, $items, &$errors) {
foreach ($items as $delta => $item) {
// Only validate fields that aren't empty.
if (!reference_field_is_empty($item, $field)) {
// Make sure the referenced entity exists.
if (!entity_load($field['settings']['entity_type'], $item['target_id'])) {
$errors[$field['field_name']][$langcode][$delta][] = array(
'error' => 'reference_exists',
'message' => t('%name: the referenced entity (%target_type %target_id) does not exist.', array(
'%name' => $instance['label'],
'%target_type' => $field['settings']['entity_type'],
'%target_id' => $item['target_id'],
)),
);
}
}
}
}
/**
* Implements hook_field_formatter_info() to register the field formatter.
*/
function reference_field_formatter_info() {
return array(
'reference_link' => array(
'label' => t('Reference link'),
'field types' => array('reference'),
),
'reference_rendered' => array(
'label' => t('Rendered entity'),
'field types' => array('reference'),
'settings' => array(
'view_mode' => 'full',
),
),
);
}
/**
* Implements hook_field_formatter_settings_summary
*/
function reference_field_formatter_settings_summary($field, $instance, $view_mode) {
$display = $instance['display'][$view_mode];
$settings = $display['settings'];
$target_entity_type = $field['settings']['entity_type'];
$target_entity_info = entity_get_info($target_entity_type);
$summary = '';
if ($display['type'] == 'reference_rendered') {
$summary = t('View mode: @view_mode', array('@view_mode' => $target_entity_info['view modes'][$settings['view_mode']]['label']));
}
return $summary;
}
/**
* Implements hook_field_formatter_settings_form
*/
function reference_field_formatter_settings_form($field, $instance, $view_mode, $form, &$form_state) {
$display = $instance['display'][$view_mode];
$settings = $display['settings'];
$target_entity_type = $field['settings']['entity_type'];
$target_entity_info = entity_get_info($target_entity_type);
$view_modes = array();
foreach ($target_entity_info['view modes'] as $key => $options) {
$view_modes[$key] = $options['label'];
}
$element = array();
if ($display['type'] == 'reference_rendered') {
$element['view_mode'] = array(
'#title' => t('View Mode'),
'#type' => 'select',
'#options' => $view_modes,
'#default_value' => $settings['view_mode'],
'#required' => TRUE,
);
}
return $element;
}
/**
* Implements hook_field_formatter_view() to render the field for display.
*/
function reference_field_formatter_view($entity_type, $entity, $field, $instance, $langcode, $items, $display) {
if ($display['type'] == 'reference_link') {
return reference_link_formatter_view($entity_type, $entity, $field, $instance, $langcode, $items, $display);
}
if ($display['type'] == 'reference_rendered') {
return reference_rendered_formatter_view($entity_type, $entity, $field, $instance, $langcode, $items, $display);
}
}
/**
* Called from reference_field_formatter_view() to create the formatter view.
*/
function reference_link_formatter_view($entity_type, $entity, $field, $instance, $langcode, $items, $display) {
$target_type = $field['settings']['entity_type'];
$elements = array();
foreach ($items as $delta => $target) {
$target_entity = entity_load($target_type, $target['target_id']);
$target_uri = $target_entity->uri();
if ($target_type == 'file') {
// Handle file stream wrappers since l() and url() currently don't.
// https://github.com/backdrop/backdrop-issues/issues/2300
$target_uri['path'] = file_create_url($target_uri['path']);
// Add options array for files until fixed in core.
// https://github.com/backdrop/backdrop-issues/issues/2299
$target_uri['options'] = array();
}
$elements[] = array(
'#markup' => l($target_entity->label(), $target_uri['path'], $target_uri['options']),
);
}
return $elements;
}
/**
* Called from reference_field_formatter_view() to create the formatter view.
*/
function reference_rendered_formatter_view($entity_type, $entity, $field, $instance, $langcode, $items, $display) {
$target_type = $field['settings']['entity_type'];
$elements = array();
// We need to guess the view function until $entity->view() is created.
// https://github.com/backdrop/backdrop-issues/issues/1739
$view_function = $target_type . "_view";
if (function_exists($view_function)) {
foreach ($items as $delta => $target) {
$target_entity = entity_load($target_type, $target['target_id']);
$elements[] = call_user_func($view_function, $target_entity, $display['settings']['view_mode'], $langcode);
// To-do: different arguments for comments.
}
}
return $elements;
}
/**
* Implements hook_field_widget_info() to define an autocomplete form widget.
*/
function reference_field_widget_info() {
return array(
'reference_autocomplete' => array(
'label' => t('Autocomplete'),
'field types' => array('reference'),
),
);
}
/**
* Implements hook_field_widget_info_alter() to enable select and buttons options.
*/
function reference_field_widget_info_alter(&$info) {
if (module_exists('options')) {
$info['options_select']['field types'][] = 'reference';
$info['options_buttons']['field types'][] = 'reference';
}
}
/**
* Implements hook_field_widget_form() to provide an autocomplete form widget .
*/
function reference_field_widget_form(&$form, &$form_state, $field, $instance, $langcode, $items, $delta, $element) {
$element['target_id'] = array(
'#type' => 'textfield',
'#title' => $instance['label'],
'#description' => $instance['description'],
'#required' => $instance['required'],
'#default_value' => isset($items[$delta]['target_id']) ? $items[$delta]['target_id'] : '',
'#autocomplete_path' => 'reference_autocomplete/' . $instance['field_name'] . '-' . $instance['entity_type'] . '-' . $instance['bundle'],
'#element_validate' => array('reference_autocomplete_validate'),
'#value_callback' => 'reference_autocomplete_value',
// Store the entity type so it can be used in the value callback.
'#settings_entity_type' => $field['settings']['entity_type'],
);
return $element;
}
/**
* Implements hook_options_list() to provide options for options module.
*/
function reference_options_list($field, $instance = NULL, $entity_type = NULL, $entity = NULL) {
if ($field['settings']['entity_type'] == 'taxonomy_term') {
return reference_options_list_taxonomy_term($instance);
}
else {
return reference_query($instance);
}
}
/**
* Implements hook_menu() to provide autocomplete callback.
*/
function reference_menu() {
$items['reference_autocomplete'] = array(
'page callback' => 'reference_autocomplete_query',
'access arguments' => array('access content'),
'type' => MENU_CALLBACK,
);
return $items;
}
/**
* Provides values for the reference field using taxonomy terms.
*/
function reference_options_list_taxonomy_term($field_instance, $filter = '', $limit = 0) {
if ($filter || $limit) {
return reference_query($field_instance, $filter, $limit);
}
$options = array();
$entity_info = entity_get_info('taxonomy_term');
// Get allowed bundles.
$bundles = array();
foreach ($field_instance['settings']['bundles'] as $bundle => $active) {
if ($active) {
$bundles[] = $bundle;
}
}
if (empty($bundles)) {
$bundles = array_keys($entity_info['bundles']);
}
// We imitate core by calling taxonomy_get_tree().
foreach ($bundles as $bundle) {
if ($vocabulary = taxonomy_vocabulary_load($bundle)) {
if ($terms = taxonomy_get_tree($vocabulary->machine_name, 0, NULL, TRUE)) {
/** @var \TaxonomyTerm $term */
foreach ($terms as $term) {
$options[$vocabulary->name][$term->tid] = str_repeat('-', $term->depth) . check_plain($term->label());
}
}
}
}
return count($bundles) == 1 ? reset($options) : $options;
}
/**
* Provides values for the reference field.
*/
function reference_query($field_instance, $filter = '', $limit = 0) {
// Load field info.
$field = field_info_field($field_instance['field_name']);
// Determine our target entity parameters based on the field settings.
$target_entity_type = $field['settings']['entity_type'];
$target_entity_status = $field_instance['settings']['status'];
$target_entity_bundles = array();
foreach ($field_instance['settings']['bundles'] as $bundle => $active) {
if ($active) {
$target_entity_bundles[] = $bundle;
}
}
// Get the database table info for the target entity type.
$entity_info = entity_get_info($target_entity_type);
$base_table = $entity_info['base table'];
$keys = $entity_info['entity keys'];
// Build the query of our base table using the text that has been typed in .
$query = db_select($base_table, 'bt')
->fields('bt', array($keys['id'], $keys['label']))
->orderBy($keys['label']);
// Add limit if specified.
if (!empty($filter)) {
$query->condition($keys['label'], '%' . db_like($filter) . '%', 'LIKE');
}
// Add limit if specified.
if ($limit > 0) {
$query->range(0, $limit);
}
// Add a condition if the entity has bundles and we are only targeting some.
if (!empty($keys['bundle']) && $target_entity_bundles) {
$query->condition($keys['bundle'], $target_entity_bundles, 'IN');
}
// Add a condition if we are limiting results to published content.
if ($target_entity_status) {
$query->condition($keys['status'], 1, '=');
}
// Execute the query, return results.
$result = $query->execute();
$matches = array();
foreach ($result as $entity) {
$matches[$entity->{$keys['id']}] = $entity->{$keys['label']};
}
return $matches;
}
/**
* Menu callback for providing autocomplete values to the reference fields.
*/
function reference_autocomplete_query($field_instance = NULL, $typed = '') {
// Get the info for the field and instance that is being autocompleted.
list($field_name, $entity_type, $bundle) = explode('-', $field_instance);
$field_instance_info = field_info_instance($entity_type, $field_name, $bundle);
// If valid field or entity names were not provided return access denied.
if (!$field_instance_info) {
backdrop_add_http_header('Status', '403 Forbidden');
backdrop_exit();
}
$items = reference_query($field_instance_info, $typed, 10);
$matches = array();
foreach ($items as $id => $label) {
$item = reference_autocomplete_item_format($id, $label);
$matches[$item] = $item;
}
backdrop_json_output($matches);
// TO DO: Why is the echo in backdrop_json_output not disabling the theme?
module_invoke_all('exit');
exit();
}
/**
* Form callback to validate the values inserted into the field after autocompleting.
*/
function reference_autocomplete_validate($element, &$form_state, $form) {
if (!empty($element['#value'])) {
if ($id = reference_autocomplete_item_extract_id($element['#value'])) {
form_set_value($element, $id, $form_state);
}
else {
form_set_value($element, "", $form_state);
form_error($element, t('You must select an option from the autocomplete dropdown.'));
}
}
}
/**
* Form callback for turning a numeric field value into an autocomplete format.
*/
function reference_autocomplete_value($element, $input = FALSE, $form_state = array()) {
// Format a default value if present and a new value has not been entered.
if($element['#default_value'] && $input === FALSE) {
$target_type = $element['#settings_entity_type'];
$target_type_info = entity_get_info($target_type);
$target_label_property = $target_type_info['entity keys']['label'];
$target_entity = entity_load($target_type, $element['#default_value']);
return reference_autocomplete_item_format($element['#default_value'], $target_entity->{$target_label_property});
}
}
/**
* Helper function to turn the label and value into an autocomplete item.
*/
function reference_autocomplete_item_format($id, $label) {
return $label . " (" . $id . ")";
}
/**
* Helper function to extract the entity id from an autocompleted item.
*/
function reference_autocomplete_item_extract_id($value) {
if (is_numeric($value)) {
return $value;
}
preg_match('/.*\(([0-9]*)\)$/', $value, $matches);
return isset($matches[1]) ? $matches[1] : false;
}
/**
* Implements hook_field_views_data().
*/
function reference_field_views_data($field) {
// Get info for the entity type this field references to add a relationship.
$target_info = entity_get_info($field['settings']['entity_type']);
// Get the default values of the views config data for this field.
$data = field_views_field_default_views_data($field);
// Alter data for both the field_data and field_revision tables.
foreach ($data as $table_name => $table_data) {
// Add a relationship to the target table from the [field_name]_target_id.
$data[$table_name][$field['field_name'] . '_target_id']['relationship'] = array(
'handler' => 'views_handler_relationship',
'base' => $target_info['base table'],
'base field' => $target_info['entity keys']['id'],
'label' => t('!type referenced by !field_name', array('!type' => $target_info['label'], '!field_name' => $field['field_name'])),
);
}
return $data;
}