function field_system_info_alter

Implements hook_system_info_alter().

Goes through a list of all modules that provide a field type, and makes them required if there are any active fields of that type.

Related topics

File

modules/field/field.module, line 366

Code

function field_system_info_alter(&$info, $file, $type) {
    if ($type == 'module' && module_hook($file->name, 'field_info')) {
        $fields = field_read_fields(array(
            'module' => $file->name,
        ), array(
            'include_deleted' => TRUE,
        ));
        if ($fields) {
            $info['required'] = TRUE;
            // Provide an explanation message (only mention pending deletions if there
            // remains no actual, non-deleted fields)
            $non_deleted = FALSE;
            foreach ($fields as $field) {
                if (empty($field['deleted'])) {
                    $non_deleted = TRUE;
                    break;
                }
            }
            if ($non_deleted) {
                if (module_exists('field_ui')) {
                    $explanation = t('Field type(s) in use - see <a href="@fields-page">Field list</a>', array(
                        '@fields-page' => url('admin/reports/fields'),
                    ));
                }
                else {
                    $explanation = t('Fields type(s) in use');
                }
            }
            else {
                $explanation = t('Fields pending deletion');
            }
            $info['explanation'] = $explanation;
        }
    }
}