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