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<?php
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/**
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* @file
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* Definition of views_handler_filter_fields_compare.
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*/
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/**
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* A handler to filter a view using fields comparison.
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*
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* @ingroup views_filter_handlers
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*/
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class views_handler_filter_fields_compare extends views_handler_filter {
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function can_expose() {
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return FALSE;
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}
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/**
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* Overrides views_handler_filter#option_definition().
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*/
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function option_definition() {
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$options = parent::option_definition();
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$options['left_field'] = $options['right_field'] = array('default' => '');
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return $options;
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}
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/**
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* Provide a list of all operators.
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*/
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function fields_operator_options() {
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return array(
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'<' => t('Is less than'),
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'<=' => t('Is less than or equal to'),
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'=' => t('Is equal to'),
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'<>' => t('Is not equal to'),
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'>=' => t('Is greater than or equal to'),
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'>' => t('Is greater than')
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);
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}
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/**
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* Provide a list of available fields.
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*/
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function field_options() {
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$options = array();
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$field_handlers = $this->view->display_handler->get_handlers('field');
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foreach ($field_handlers as $field => $handler) {
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if ($handler->table != 'views') {
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$options[$field] = $handler->ui_name();
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}
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}
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return $options;
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}
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/**
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* Overrides views_handler_filter#options_form().
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*/
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function options_form(&$form, &$form_state) {
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parent::options_form($form, $form_state);
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$field_options = $this->field_options();
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$form['left_field'] = array(
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'#type' => 'select',
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'#title' => t('Left field'),
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'#default_value' => $this->options['left_field'],
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'#options' => $field_options,
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'#weight' => -3,
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);
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$form['operator'] = array(
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'#type' => 'select',
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'#title' => t('Operator'),
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'#default_value' => $this->options['operator'],
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'#options' => $this->fields_operator_options(),
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'#weight' => -2,
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);
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$form['right_field'] = array(
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'#type' => 'select',
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'#title' => t('Right field'),
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'#default_value' => $this->options['right_field'],
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'#options' => $field_options,
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'#weight' => -1,
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);
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}
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/**
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* Overrides views_handler_filter#query().
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*
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* Build extra condition from existing fields (from existing joins).
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*/
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function query() {
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$left = $this->options['left_field'];
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$right = $this->options['right_field'];
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// Get all existing field handlers.
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$field_handlers = $this->view->display_handler->get_handlers('field');
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// Make sure the selected fields still exist.
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if (!isset($field_handlers[$left], $field_handlers[$right])) {
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return;
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}
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// Get the left table and field.
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$left_handler = $field_handlers[$left];
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$left_handler->set_relationship();
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$left_table_alias = $this->query->ensure_table($left_handler->table, $left_handler->relationship);
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// Get the left table and field.
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$right_handler = $field_handlers[$right];
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$right_handler->set_relationship();
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$right_table_alias = $this->query->ensure_table($right_handler->table, $right_handler->relationship);
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// Build piece of SQL.
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$snippet =
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$left_table_alias . '.' . $left_handler->real_field .
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' ' . $this->options['operator'] . ' ' .
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$right_table_alias . '.' . $right_handler->real_field;
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$this->query->add_where_expression($this->options['group'], $snippet);
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}
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/**
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* Overrides views_handler_filter#admin_summary().
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*/
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function admin_summary() {
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return check_plain(
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$this->options['left_field'] . ' ' .
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$this->options['operator'] . ' ' .
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$this->options['right_field']
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);
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}
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}
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