class GroupwiseMax

Same name in other branches
  1. 8.9.x core/modules/views/src/Plugin/views/relationship/GroupwiseMax.php \Drupal\views\Plugin\views\relationship\GroupwiseMax
  2. 10 core/modules/views/src/Plugin/views/relationship/GroupwiseMax.php \Drupal\views\Plugin\views\relationship\GroupwiseMax
  3. 11.x core/modules/views/src/Plugin/views/relationship/GroupwiseMax.php \Drupal\views\Plugin\views\relationship\GroupwiseMax

The relationship handler for groupwise maximum queries.

It allows a groupwise maximum of the linked in table. For a definition, see: http://dev.mysql.com/doc/refman/5.0/en/example-maximum-column-group-row… In lay terms, instead of joining to get all matching records in the linked table, we get only one record, a 'representative record' picked according to a given criteria.

Example: Suppose we have a term view that gives us the terms: Horse, Cat, Aardvark. We wish to show for each term the most recent node of that term. What we want is some kind of relationship from term to node. But a regular relationship will give us all the nodes for each term, giving the view multiple rows per term. What we want is just one representative node per term, the node that is the 'best' in some way: eg, the most recent, the most commented on, the first in alphabetical order.

This handler gives us that kind of relationship from term to node. The method of choosing the 'best' implemented with a sort that the user selects in the relationship settings.

So if we want our term view to show the most commented node for each term, add the relationship and in its options, pick the 'Comment count' sort.

Relationship definition

  • 'outer field': The outer field to substitute into the correlated subquery. This must be the full field name, not the alias. Eg: 'term_data.tid'.
  • 'argument table', 'argument field': These options define a views argument that the subquery must add to itself to filter by the main view. Example: the main view shows terms, this handler is being used to get to the nodes base table. Your argument must be 'term_node', 'tid', as this is the argument that should be added to a node view to filter on terms.

A note on performance: This relationship uses a correlated subquery, which is expensive. Subsequent versions of this handler could also implement the alternative way of doing this, with a join -- though this looks like it could be pretty messy to implement. This is also an expensive method, so providing both methods and allowing the user to choose which one works fastest for their data might be the best way. If your use of this relationship handler is likely to result in large data sets, you might want to consider storing statistics in a separate table, in the same way as node_comment_statistics.

Plugin annotation

@ViewsRelationship("groupwise_max");

Hierarchy

Expanded class hierarchy of GroupwiseMax

Related topics

File

core/modules/views/src/Plugin/views/relationship/GroupwiseMax.php, line 62

Namespace

Drupal\views\Plugin\views\relationship
View source
class GroupwiseMax extends RelationshipPluginBase {
    
    /**
     * {@inheritdoc}
     */
    protected function defineOptions() {
        $options = parent::defineOptions();
        $options['subquery_sort'] = [
            'default' => NULL,
        ];
        // Descending more useful.
        $options['subquery_order'] = [
            'default' => 'DESC',
        ];
        $options['subquery_regenerate'] = [
            'default' => FALSE,
        ];
        $options['subquery_view'] = [
            'default' => FALSE,
        ];
        $options['subquery_namespace'] = [
            'default' => FALSE,
        ];
        return $options;
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildOptionsForm(&$form, FormStateInterface $form_state) {
        parent::buildOptionsForm($form, $form_state);
        // Get the sorts that apply to our base.
        $sorts = Views::viewsDataHelper()->fetchFields($this->definition['base'], 'sort');
        $sort_options = [];
        foreach ($sorts as $sort_id => $sort) {
            $sort_options[$sort_id] = "{$sort['group']}: {$sort['title']}";
        }
        $base_table_data = Views::viewsData()->get($this->definition['base']);
        // Extends the relationship's basic options, allowing the user to pick a
        // sort and an order for it.
        $form['subquery_sort'] = [
            '#type' => 'select',
            '#title' => $this->t('Representative sort criteria'),
            // Provide the base field as sane default sort option.
'#default_value' => !empty($this->options['subquery_sort']) ? $this->options['subquery_sort'] : $this->definition['base'] . '.' . $base_table_data['table']['base']['field'],
            '#options' => $sort_options,
            '#description' => $this->t("The sort criteria is applied to the data brought in by the relationship to determine how a representative item is obtained for each row. For example, to show the most recent node for each user, pick 'Content: Updated date'."),
        ];
        $form['subquery_order'] = [
            '#type' => 'radios',
            '#title' => $this->t('Representative sort order'),
            '#description' => $this->t("The ordering to use for the sort criteria selected above."),
            '#options' => [
                'ASC' => $this->t('Ascending'),
                'DESC' => $this->t('Descending'),
            ],
            '#default_value' => $this->options['subquery_order'],
        ];
        $form['subquery_namespace'] = [
            '#type' => 'textfield',
            '#title' => $this->t('Subquery namespace'),
            '#description' => $this->t('Advanced. Enter a namespace for the subquery used by this relationship.'),
            '#default_value' => $this->options['subquery_namespace'],
        ];
        // WIP: This stuff doesn't work yet: namespacing issues.
        // A list of suitable views to pick one as the subview.
        $views = [
            '' => '- None -',
        ];
        foreach (Views::getAllViews() as $view) {
            // Only get views that are suitable:
            // - base must the base that our relationship joins towards
            // - must have fields.
            if ($view->get('base_table') == $this->definition['base'] && !empty($view->getDisplay('default')['display_options']['fields'])) {
                // TODO: check the field is the correct sort?
                // or let users hang themselves at this stage and check later?
                $views[$view->id()] = $view->id();
            }
        }
        $form['subquery_view'] = [
            '#type' => 'select',
            '#title' => $this->t('Representative view'),
            '#default_value' => $this->options['subquery_view'],
            '#options' => $views,
            '#description' => $this->t('Advanced. Use another view to generate the relationship subquery. This allows you to use filtering and more than one sort. If you pick a view here, the sort options above are ignored. Your view must have the ID of its base as its only field, and should have some kind of sorting.'),
        ];
        $form['subquery_regenerate'] = [
            '#type' => 'checkbox',
            '#title' => $this->t('Generate subquery each time view is run'),
            '#default_value' => $this->options['subquery_regenerate'],
            '#description' => $this->t('Will re-generate the subquery for this relationship every time the view is run, instead of only when these options are saved. Use for testing if you are making changes elsewhere. WARNING: seriously impairs performance.'),
        ];
    }
    
    /**
     * Helper function to create a pseudo view.
     *
     * We use this to obtain our subquery SQL.
     */
    protected function getTemporaryView() {
        $view = View::create([
            'base_table' => $this->definition['base'],
        ]);
        $view->addDisplay('default');
        return $view->getExecutable();
    }
    
    /**
     * When the form is submitted, make sure to clear the subquery string cache.
     */
    public function submitOptionsForm(&$form, FormStateInterface $form_state) {
        $cid = 'views_relationship_groupwise_max:' . $this->view->storage
            ->id() . ':' . $this->view->current_display . ':' . $this->options['id'];
        \Drupal::cache('data')->delete($cid);
    }
    
    /**
     * Generate a subquery given the user options, as set in the options.
     *
     * These are passed in rather than picked up from the object because we
     * generate the subquery when the options are saved, rather than when the view
     * is run. This saves considerable time.
     *
     * @param $options
     *   An array of options:
     *    - subquery_sort: the id of a views sort.
     *    - subquery_order: either ASC or DESC.
     *
     * @return string
     *   The subquery SQL string, ready for use in the main query.
     */
    protected function leftQuery($options) {
        // Either load another view, or create one on the fly.
        if ($options['subquery_view']) {
            $temp_view = Views::getView($options['subquery_view']);
            // Remove all fields from default display
            unset($temp_view->display['default']['display_options']['fields']);
        }
        else {
            // Create a new view object on the fly, which we use to generate a query
            // object and then get the SQL we need for the subquery.
            $temp_view = $this->getTemporaryView();
            // Add the sort from the options to the default display.
            // This is broken, in that the sort order field also gets added as a
            // select field. See https://www.drupal.org/node/844910.
            // We work around this further down.
            $sort = $options['subquery_sort'];
            [
                $sort_table,
                $sort_field,
            ] = explode('.', $sort);
            $sort_options = [
                'order' => $options['subquery_order'],
            ];
            $temp_view->addHandler('default', 'sort', $sort_table, $sort_field, $sort_options);
        }
        // Get the namespace string.
        $temp_view->namespace = !empty($options['subquery_namespace']) ? '_' . $options['subquery_namespace'] : '_INNER';
        $this->subquery_namespace = !empty($options['subquery_namespace']) ? '_' . $options['subquery_namespace'] : 'INNER';
        // The value we add here does nothing, but doing this adds the right tables
        // and puts in a WHERE clause with a placeholder we can grab later.
        $temp_view->args[] = '**CORRELATED**';
        // Add the base table ID field.
        $temp_view->addHandler('default', 'field', $this->definition['base'], $this->definition['field']);
        $relationship_id = NULL;
        // Add the used relationship for the subjoin, if defined.
        if (isset($this->definition['relationship'])) {
            [
                $relationship_table,
                $relationship_field,
            ] = explode(':', $this->definition['relationship']);
            $relationship_id = $temp_view->addHandler('default', 'relationship', $relationship_table, $relationship_field);
        }
        $temp_item_options = [
            'relationship' => $relationship_id,
        ];
        // Add the correct argument for our relationship's base
        // ie the 'how to get back to base' argument.
        // The relationship definition tells us which one to use.
        $temp_view->addHandler('default', 'argument', $this->definition['argument table'], $this->definition['argument field'], $temp_item_options);
        // Build the view. The creates the query object and produces the query
        // string but does not run any queries.
        $temp_view->build();
        // Now take the SelectQuery object the View has built and massage it
        // somewhat so we can get the SQL query from it.
        $subquery = $temp_view->build_info['query'];
        // Workaround until https://www.drupal.org/node/844910 is fixed:
        // Remove all fields from the SELECT except the base id.
        $fields =& $subquery->getFields();
        foreach (array_keys($fields) as $field_name) {
            // The base id for this subquery is stored in our definition.
            if ($field_name != $this->definition['field']) {
                unset($fields[$field_name]);
            }
        }
        // Make every alias in the subquery safe within the outer query by
        // appending a namespace to it, '_inner' by default.
        $tables =& $subquery->getTables();
        foreach (array_keys($tables) as $table_name) {
            $tables[$table_name]['alias'] .= $this->subquery_namespace;
            // Namespace the join on every table.
            if (isset($tables[$table_name]['condition'])) {
                $tables[$table_name]['condition'] = $this->conditionNamespace($tables[$table_name]['condition']);
            }
        }
        // Namespace fields.
        foreach (array_keys($fields) as $field_name) {
            $fields[$field_name]['table'] .= $this->subquery_namespace;
            $fields[$field_name]['alias'] .= $this->subquery_namespace;
        }
        // Namespace conditions.
        $where =& $subquery->conditions();
        $this->alterSubqueryCondition($subquery, $where);
        // Not sure why, but our sort order clause doesn't have a table.
        // TODO: the call to addHandler() above to add the sort handler is probably
        // wrong -- needs attention from someone who understands it.
        // In the meantime, this works, but with a leap of faith.
        $orders =& $subquery->getOrderBy();
        foreach ($orders as $order_key => $order) {
            // But if we're using a whole view, we don't know what we have!
            if ($options['subquery_view']) {
                [
                    $sort_table,
                    $sort_field,
                ] = explode('.', $order_key);
            }
            $orders[$sort_table . $this->subquery_namespace . '.' . $sort_field] = $order;
            unset($orders[$order_key]);
        }
        // The query we get doesn't include the LIMIT, so add it here.
        $subquery->range(0, 1);
        // Extract the SQL the temporary view built.
        $subquery_sql = $subquery->__toString();
        // Replace the placeholder with the outer, correlated field.
        // Eg, change the placeholder ':users_uid' into the outer field 'users.uid'.
        // We have to work directly with the SQL, because putting a name of a field
        // into a SelectQuery that it does not recognize (because it's outer) just
        // makes it treat it as a string.
        $outer_placeholder = ':' . str_replace('.', '_', $this->definition['outer field']);
        $subquery_sql = str_replace($outer_placeholder, $this->definition['outer field'], $subquery_sql);
        return $subquery_sql;
    }
    
    /**
     * Recursive helper to add a namespace to conditions.
     *
     * Similar to _views_query_tag_alter_condition().
     *
     * (Though why is the condition we get in a simple query 3 levels deep???)
     */
    protected function alterSubqueryCondition(AlterableInterface $query, &$conditions) {
        foreach ($conditions as $condition_id => &$condition) {
            // Skip the #conjunction element.
            if (is_numeric($condition_id)) {
                if (is_string($condition['field'])) {
                    $condition['field'] = $this->conditionNamespace($condition['field']);
                }
                elseif (is_object($condition['field'])) {
                    $sub_conditions =& $condition['field']->conditions();
                    $this->alterSubqueryCondition($query, $sub_conditions);
                }
            }
        }
    }
    
    /**
     * Helper function to namespace query pieces.
     *
     * Turns 'foo.bar' into '"foo_NAMESPACE".bar'.
     * PostgreSQL doesn't support mixed-cased identifiers unless quoted, so we
     * need to quote each single part to prevent from query exceptions.
     */
    protected function conditionNamespace($string) {
        $parts = explode(' = ', $string);
        foreach ($parts as &$part) {
            if (strpos($part, '.') !== FALSE) {
                $part = '"' . str_replace('.', $this->subquery_namespace . '".', $part);
            }
        }
        return implode(' = ', $parts);
    }
    
    /**
     * {@inheritdoc}
     */
    public function query() {
        // Figure out what base table this relationship brings to the party.
        $table_data = Views::viewsData()->get($this->definition['base']);
        $base_field = empty($this->definition['base field']) ? $table_data['table']['base']['field'] : $this->definition['base field'];
        $this->ensureMyTable();
        $def = $this->definition;
        $def['table'] = $this->definition['base'];
        $def['field'] = $base_field;
        $def['left_table'] = $this->tableAlias;
        $def['left_field'] = $this->field;
        $def['adjusted'] = TRUE;
        if (!empty($this->options['required'])) {
            $def['type'] = 'INNER';
        }
        if ($this->options['subquery_regenerate']) {
            // For testing only, regenerate the subquery each time.
            $def['left_query'] = $this->leftQuery($this->options);
        }
        else {
            // Get the stored subquery SQL string.
            $cid = 'views_relationship_groupwise_max:' . $this->view->storage
                ->id() . ':' . $this->view->current_display . ':' . $this->options['id'];
            $cache = \Drupal::cache('data')->get($cid);
            if (isset($cache->data)) {
                $def['left_query'] = $cache->data;
            }
            else {
                $def['left_query'] = $this->leftQuery($this->options);
                \Drupal::cache('data')->set($cid, $def['left_query']);
            }
        }
        if (!empty($def['join_id'])) {
            $id = $def['join_id'];
        }
        else {
            $id = 'subquery';
        }
        $join = Views::pluginManager('join')->createInstance($id, $def);
        // use a short alias for this:
        $alias = $def['table'] . '_' . $this->table;
        $this->alias = $this->query
            ->addRelationship($alias, $join, $this->definition['base'], $this->relationship);
    }

}

Members

Title Sort descending Modifiers Object type Summary Overriden Title Overrides
DerivativeInspectionInterface::getBaseId public function Gets the base_plugin_id of the plugin instance. 1
DerivativeInspectionInterface::getDerivativeId public function Gets the derivative_id of the plugin instance. 1
GroupwiseMax::alterSubqueryCondition protected function Recursive helper to add a namespace to conditions.
GroupwiseMax::buildOptionsForm public function Provide a form to edit options for this plugin. Overrides RelationshipPluginBase::buildOptionsForm
GroupwiseMax::conditionNamespace protected function Helper function to namespace query pieces.
GroupwiseMax::defineOptions protected function Information about options for all kinds of purposes will be held here. Overrides RelationshipPluginBase::defineOptions
GroupwiseMax::getTemporaryView protected function Helper function to create a pseudo view.
GroupwiseMax::leftQuery protected function Generate a subquery given the user options, as set in the options.
GroupwiseMax::query public function Add anything to the query that we might need to. Overrides RelationshipPluginBase::query
GroupwiseMax::submitOptionsForm public function When the form is submitted, make sure to clear the subquery string cache. Overrides PluginBase::submitOptionsForm
HandlerBase::$field public property With field you can override the realField if the real field is not set.
HandlerBase::$moduleHandler protected property The module handler. 3
HandlerBase::$query public property Where the $query object will reside. 7
HandlerBase::$realField public property The real field.
HandlerBase::$relationship public property The relationship used for this field.
HandlerBase::$table public property The table this handler is attached to.
HandlerBase::$tableAlias public property The alias of the table of this handler which is used in the query.
HandlerBase::$viewsData protected property The views data service.
HandlerBase::acceptExposedInput public function Take input from exposed handlers and assign to this handler, if necessary. 1
HandlerBase::access public function Check whether given user has access to this handler. Overrides ViewsHandlerInterface::access 4
HandlerBase::adminLabel public function Return a string representing this handler's name in the UI. Overrides ViewsHandlerInterface::adminLabel 4
HandlerBase::adminSummary public function Provide text for the administrative summary. Overrides ViewsHandlerInterface::adminSummary 4
HandlerBase::breakString public static function Breaks x,y,z and x+y+z into an array. Overrides ViewsHandlerInterface::breakString
HandlerBase::broken public function Determines if the handler is considered 'broken'. Overrides ViewsHandlerInterface::broken
HandlerBase::buildExposedForm public function Render our chunk of the exposed handler form when selecting. 1
HandlerBase::buildExposeForm public function Form for exposed handler options. 2
HandlerBase::buildExtraOptionsForm public function Provide a form for setting options. 1
HandlerBase::buildGroupByForm public function Provide a form for aggregation settings. 1
HandlerBase::canExpose public function Determine if a handler can be exposed. 2
HandlerBase::caseTransform protected function Transform a string by a certain method.
HandlerBase::defaultExposeOptions public function Set new exposed option defaults when exposed setting is flipped on. 2
HandlerBase::defineExtraOptions public function Provide defaults for the handler.
HandlerBase::displayExposedForm public function Displays the Expose form.
HandlerBase::ensureMyTable public function Ensures that the main table for this handler is in the query. Overrides ViewsHandlerInterface::ensureMyTable 2
HandlerBase::exposedInfo public function Get information about the exposed form for the form renderer. 1
HandlerBase::getDateField public function Creates cross-database SQL dates. 2
HandlerBase::getDateFormat public function Creates cross-database SQL date formatting. 2
HandlerBase::getEntityType public function Determines the entity type used by this handler. Overrides ViewsHandlerInterface::getEntityType
HandlerBase::getField public function Shortcut to get a handler's raw field value. Overrides ViewsHandlerInterface::getField
HandlerBase::getJoin public function Get the join object that should be used for this handler. Overrides ViewsHandlerInterface::getJoin
HandlerBase::getModuleHandler protected function Gets the module handler.
HandlerBase::getTableJoin public static function Fetches a handler to join one table to a primary table from the data cache. Overrides ViewsHandlerInterface::getTableJoin
HandlerBase::getViewsData protected function Gets views data service.
HandlerBase::hasExtraOptions public function Determines if the handler has extra options. 1
HandlerBase::isAGroup public function Returns TRUE if the exposed filter works like a grouped filter. 1
HandlerBase::isExposed public function Determine if this item is 'exposed'.
HandlerBase::multipleExposedInput public function Define if the exposed input has to be submitted multiple times. 1
HandlerBase::placeholder protected function Provides a unique placeholders for handlers.
HandlerBase::postExecute public function Run after the view is executed, before the result is cached. Overrides ViewsHandlerInterface::postExecute
HandlerBase::preQuery public function Run before the view is built. Overrides ViewsHandlerInterface::preQuery 2
HandlerBase::sanitizeValue public function Sanitize the value for output. Overrides ViewsHandlerInterface::sanitizeValue
HandlerBase::setModuleHandler public function Sets the module handler.
HandlerBase::setRelationship public function Sets up any needed relationship. Overrides ViewsHandlerInterface::setRelationship
HandlerBase::setViewsData public function
HandlerBase::showExposeButton public function Shortcut to display the expose/hide button. 2
HandlerBase::showExposeForm public function Shortcut to display the exposed options form. Overrides ViewsHandlerInterface::showExposeForm
HandlerBase::storeExposedInput public function If set to remember exposed input in the session, store it there. 1
HandlerBase::submitExposed public function Submit the exposed handler form.
HandlerBase::submitExposeForm public function Perform any necessary changes to the form exposes prior to storage.
HandlerBase::submitExtraOptionsForm public function Perform any necessary changes to the form values prior to storage.
HandlerBase::submitFormCalculateOptions public function Calculates options stored on the handler. 1
HandlerBase::submitGroupByForm public function Perform any necessary changes to the form values prior to storage. 1
HandlerBase::submitTemporaryForm public function Submits a temporary form.
HandlerBase::validate public function Validate that the plugin is correct and can be saved. Overrides PluginBase::validate 2
HandlerBase::validateExposed public function Validate the exposed handler form. 4
HandlerBase::validateExposeForm public function Validate the options form. 2
HandlerBase::validateExtraOptionsForm public function Validate the options form.
HandlerBase::__construct public function Constructs a Handler object. Overrides PluginBase::__construct 45
PluginBase::$definition public property Plugins' definition.
PluginBase::$displayHandler public property The display object this plugin is for.
PluginBase::$options public property Options for this plugin will be held here.
PluginBase::$renderer protected property Stores the render API renderer. 3
PluginBase::$usesOptions protected property Denotes whether the plugin has an additional options form. 8
PluginBase::$view public property The top object of a view. 1
PluginBase::create public static function Creates an instance of the plugin. Overrides ContainerFactoryPluginInterface::create 63
PluginBase::destroy public function Clears a plugin. Overrides ViewsPluginInterface::destroy 2
PluginBase::doFilterByDefinedOptions protected function Do the work to filter out stored options depending on the defined options.
PluginBase::filterByDefinedOptions public function Filter out stored options depending on the defined options. Overrides ViewsPluginInterface::filterByDefinedOptions
PluginBase::getAvailableGlobalTokens public function Returns an array of available token replacements. Overrides ViewsPluginInterface::getAvailableGlobalTokens
PluginBase::getProvider public function Returns the plugin provider. Overrides ViewsPluginInterface::getProvider
PluginBase::getRenderer protected function Returns the render API renderer. 1
PluginBase::globalTokenForm public function Adds elements for available core tokens to a form. Overrides ViewsPluginInterface::globalTokenForm
PluginBase::globalTokenReplace public function Returns a string with any core tokens replaced. Overrides ViewsPluginInterface::globalTokenReplace
PluginBase::INCLUDE_ENTITY constant Include entity row languages when listing languages.
PluginBase::INCLUDE_NEGOTIATED constant Include negotiated languages when listing languages.
PluginBase::listLanguages protected function Makes an array of languages, optionally including special languages.
PluginBase::pluginTitle public function Return the human readable name of the display. Overrides ViewsPluginInterface::pluginTitle
PluginBase::preRenderAddFieldsetMarkup public static function Moves form elements into fieldsets for presentation purposes. Overrides ViewsPluginInterface::preRenderAddFieldsetMarkup
PluginBase::preRenderFlattenData public static function Flattens the structure of form elements. Overrides ViewsPluginInterface::preRenderFlattenData
PluginBase::queryLanguageSubstitutions public static function Returns substitutions for Views queries for languages.
PluginBase::setOptionDefaults protected function Fills up the options of the plugin with defaults.
PluginBase::summaryTitle public function Returns the summary of the settings in the display. Overrides ViewsPluginInterface::summaryTitle 6
PluginBase::themeFunctions public function Provide a full list of possible theme templates used by this style. Overrides ViewsPluginInterface::themeFunctions 1
PluginBase::trustedCallbacks public static function Lists the trusted callbacks provided by the implementing class. Overrides TrustedCallbackInterface::trustedCallbacks 6
PluginBase::unpackOptions public function Unpacks options over our existing defaults. Overrides ViewsPluginInterface::unpackOptions
PluginBase::usesOptions public function Returns the usesOptions property. Overrides ViewsPluginInterface::usesOptions 8
PluginBase::validateOptionsForm public function Validate the options form. Overrides ViewsPluginInterface::validateOptionsForm 15
PluginBase::viewsTokenReplace protected function Replaces Views' tokens in a given string. 1
PluginBase::VIEWS_QUERY_LANGUAGE_SITE_DEFAULT constant Query string to indicate the site default language.
PluginInspectionInterface::getPluginDefinition public function Gets the definition of the plugin implementation. 6
PluginInspectionInterface::getPluginId public function Gets the plugin_id of the plugin instance. 2
RelationshipPluginBase::$alias public property The relationship alias.
RelationshipPluginBase::calculateDependencies public function Calculates dependencies for the configured plugin. Overrides HandlerBase::calculateDependencies 1
RelationshipPluginBase::init public function Overrides \Drupal\views\Plugin\views\HandlerBase::init(). Overrides HandlerBase::init
RelationshipPluginBase::usesGroupBy public function Provides the handler some groupby. Overrides HandlerBase::usesGroupBy
TrustedCallbackInterface::THROW_EXCEPTION constant Untrusted callbacks throw exceptions.
TrustedCallbackInterface::TRIGGER_SILENCED_DEPRECATION constant Untrusted callbacks trigger silenced E_USER_DEPRECATION errors.
TrustedCallbackInterface::TRIGGER_WARNING constant Untrusted callbacks trigger E_USER_WARNING errors.

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