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<?php
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/**
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* @file
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* Definition of views_handler_filter_term_node_tid_depth.
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*/
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/**
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* Filter for taxonomy terms with depth (including selection by simple
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* hierarchical select).
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*
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* This handler is actually part of the node table and has some restrictions,
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* because it uses a subquery to find nodes with.
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*
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* @ingroup views_filter_handlers
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*/
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class shs_handler_filter_term_node_tid_depth extends shs_handler_filter_term_node_tid {
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function operator_options($which = 'title') {
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return array(
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'or' => t('Is one of'),
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);
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}
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function option_definition() {
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$options = parent::option_definition();
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$options['depth'] = array('default' => 0);
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return $options;
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}
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function extra_options_form(&$form, &$form_state) {
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parent::extra_options_form($form, $form_state);
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$form['depth'] = array(
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'#type' => 'weight',
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'#title' => t('Depth'),
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'#default_value' => $this->options['depth'],
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'#description' => t('The depth will match nodes tagged with terms in the hierarchy. For example, if you have the term "fruit" and a child term "apple", with a depth of 1 (or higher) then filtering for the term "fruit" will get nodes that are tagged with "apple" as well as "fruit". If negative, the reverse is true; searching for "apple" will also pick up nodes tagged with "fruit" if depth is -1 (or lower).'),
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);
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}
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function query() {
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// Check if multiple select allowed.
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if ($this->options['expose']['multiple']) {
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// If no filter values are present, then do nothing.
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if ($this->value == 'All') {
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return;
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}
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else {
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$this->value = explode('+', $this->value[0]);
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$this->value = explode(',', end($this->value));
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$operator = 'IN';
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}
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}
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else {
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// If no filter values are present, then do nothing.
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if (count($this->value) == 0) {
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return;
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}
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elseif (count($this->value) == 1) {
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// $this->value is an array with a single element so convert it.
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if (is_array($this->value)) {
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$this->value = current($this->value);
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}
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$operator = '=';
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}
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else {
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$operator = 'IN';
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}
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}
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// The normal use of ensure_my_table() here breaks Views.
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// So instead we trick the filter into using the alias of the base table.
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// See http://drupal.org/node/271833
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// If a relationship is set, we must use the alias it provides.
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if (!empty($this->relationship)) {
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$this->table_alias = $this->relationship;
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}
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// If no relationship, then use the alias of the base table.
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elseif (isset($this->query->table_queue[$this->query->base_table]['alias'])) {
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$this->table_alias = $this->query->table_queue[$this->query->base_table]['alias'];
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}
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// This should never happen, but if it does, we fail quietly.
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else {
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return;
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}
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// Now build the subqueries.
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$subquery = db_select('taxonomy_index', 'tn');
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$subquery->addField('tn', 'nid');
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$where = db_or()->condition('tn.tid', $this->value, $operator);
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$last = "tn";
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if ($this->options['depth'] > 0) {
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$subquery->leftJoin('taxonomy_term_hierarchy', 'th', "th.tid = tn.tid");
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$last = "th";
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foreach (range(1, abs($this->options['depth'])) as $count) {
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$subquery->leftJoin('taxonomy_term_hierarchy', "th$count", "$last.parent = th$count.tid");
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$where->condition("th$count.tid", $this->value, $operator);
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$last = "th$count";
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}
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}
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elseif ($this->options['depth'] < 0) {
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foreach (range(1, abs($this->options['depth'])) as $count) {
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$subquery->leftJoin('taxonomy_term_hierarchy', "th$count", "$last.tid = th$count.parent");
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$where->condition("th$count.tid", $this->value, $operator);
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$last = "th$count";
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}
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}
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$subquery->condition($where);
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$this->query->add_where($this->options['group'], "$this->table_alias.$this->real_field", $subquery, 'IN');
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}
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}
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