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How can you implement custom filter handler for an existing field in Views 3? With hook_views_data() you can expose a new table to views but how can you alter the handler for an existing field?

4

To add a Drupal 7 views custom filter handler for an existing field, you should implement the following hooks.

//in yourmodule.module
/**
 * Implements hook_views_api().
 */
function yourmodule_views_api() {
  return array(
    'api' => 3,
  );
}

// in yourmodule.views.inc
/**
 * Implements hook_field_views_data_alter().
 */    
function yourmodule_field_views_data_alter(&$result, $field, $module) {
  if($field['field_name'] == 'field_your_existing_field'){
    $name = $field['field_name'];
    foreach ($result as $table_name => $table_data) {
      if (isset($table_data[$field['field_name']]['field'])) {
        $result[$table_name][$field['field_name'] . '_value']['filter']['handler'] = 'your_custom_handler_in_separate_inc_file';
      }
    }
  }
}

//your custom handler class in separate file
class your_custom_handler_in_separate_inc_file extends existing_handler_class{
// your code goes here
}

//Don't forget to add your_custom_handler_in_separate_inc_file.inc file in your module's .info file like.

files[] = your_custom_handler_in_separate_inc_file.inc
  • I guess we can also change the field's data group to make it appear in a more explicit section under the views'UI. Thanks ! – B2F Oct 21 '14 at 19:54

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