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<?php
namespace Drupal\views\Plugin\views\join;
/**
* Join handler for relationships that join with a subquery as the left field.
*
* For example:
* @code
* LEFT JOIN node node_term_data ON ([YOUR SUBQUERY HERE]) = node_term_data.nid
* @endcode
*
* Join definition: same as \Drupal\views\Plugin\views\join\JoinPluginBase,
* except:
* - left_query: The subquery to use in the left side of the join clause.
*
* @ingroup views_join_handlers
* @ViewsJoin("subquery")
*/
class Subquery extends JoinPluginBase {
/**
* Constructs a Subquery object.
*/
public function __construct(array $configuration, $plugin_id, $plugin_definition) {
parent::__construct($configuration, $plugin_id, $plugin_definition);
$this->left_query = $this->configuration['left_query'];
}
/**
* Builds the SQL for the join this object represents.
*
* @param \Drupal\Core\Database\Query\SelectInterface $select_query
* The select query object.
* @param string $table
* The base table to join.
* @param \Drupal\views\Plugin\views\query\QueryPluginBase $view_query
* The source views query.
*/
public function buildJoin($select_query, $table, $view_query) {
if (empty($this->configuration['table formula'])) {
$right_table = "{" . $this->table . "}";
}
else {
$right_table = $this->configuration['table formula'];
}
// Add our join condition, using a subquery on the left instead of a field.
$condition = "($this->left_query) = $table[alias].$this->field";
$arguments = [];
// Tack on the extra.
// This is just copied verbatim from the parent class, which itself has a
// bug: https://www.drupal.org/node/1118100.
if (isset($this->extra)) {
if (is_array($this->extra)) {
$extras = [];
foreach ($this->extra as $info) {
// Figure out the table name. Remember, only use aliases provided
// if at all possible.
$join_table = '';
if (!array_key_exists('table', $info)) {
$join_table = $table['alias'] . '.';
}
elseif (isset($info['table'])) {
$join_table = $info['table'] . '.';
}
$placeholder = ':views_join_condition_' . $select_query->nextPlaceholder();
if (is_array($info['value'])) {
$operator = !empty($info['operator']) ? $info['operator'] : 'IN';
// Transform from IN() notation to = notation if just one value.
if (count($info['value']) == 1) {
$info['value'] = array_shift($info['value']);
$operator = $operator == 'NOT IN' ? '!=' : '=';
}
}
else {
$operator = !empty($info['operator']) ? $info['operator'] : '=';
}
$extras[] = "$join_table$info[field] $operator $placeholder";
$arguments[$placeholder] = $info['value'];
}
if ($extras) {
if (count($extras) == 1) {
$condition .= ' AND ' . array_shift($extras);
}
else {
$condition .= ' AND (' . implode(' ' . $this->extraOperator . ' ', $extras) . ')';
}
}
}
elseif ($this->extra && is_string($this->extra)) {
$condition .= " AND ($this->extra)";
}
}
$select_query->addJoin($this->type, $right_table, $table['alias'], $condition, $arguments);
}
}