function data_export_import_export_nodes_to_file in Data export import 7

Export the required dataset files.

This function will look at which content types have been selected for exporting to file and call a function to export thoese content types. The $dataset_files_created variable will hold the names of all the dataset files which were created so it can be handed back to the calling code for display to the user.

Parameters

array $form_state: Current values held in the form.

Return value

bool TRUE if all ran OK.

1 call to data_export_import_export_nodes_to_file()

data_export_import_export_nodes_form_submit in includes/profiles/nodes.inc

Function to process form to export nodes.

File

includes/profiles/nodes.inc, line 89

Enables nodes to be exported and imported.

Code

function data_export_import_export_nodes_to_file($form_state) {

  // See if any content types were selected - if none then exit out
  // gracefully.
  $at_least_one_content_type_is_selected_flag = FALSE;
  foreach ($form_state['values']['export_nodes']['content_types'] as $content_type => $value) {
    if ($value == 1) {
      $at_least_one_content_type_is_selected_flag = TRUE;
    }
  }
  if (!$at_least_one_content_type_is_selected_flag) {
    drupal_set_message(t("No content types selected."));
    return TRUE;
  }

  // Create the default directory to hold the datasets.
  $dataset_directory_parent_directory = variable_get('file_public_path', conf_path() . '/files') . "/data_export_import";
  file_prepare_directory($dataset_directory_parent_directory, FILE_CREATE_DIRECTORY);
  $dataset_directory = variable_get('file_public_path', conf_path() . '/files') . "/data_export_import/nodes/";
  file_prepare_directory($dataset_directory, FILE_CREATE_DIRECTORY);

  // Adding in the main values to the $batch variable.
  $batch = array();
  $batch['finished'] = 'data_export_import_batch_export_nodes_finished';
  $batch['title'] = t('Exporting nodes');
  $batch['init_message'] = t('The exportation of nodes starting.');
  $batch['progress_message'] = t('Processed @current out of @total.');
  $batch['error_message'] = t('Exporting nodes has encountered an error.');
  $batch['file'] = drupal_get_path('module', 'data_export_import') . '/includes/profiles/nodes.inc';

  // We can loop through which content types need to be exported.
  // The #post array will only contain values which have been set to
  // have a value of '1'. We will build up the $batch object with the
  // required operations.
  foreach ($form_state['values']['export_nodes']['content_types'] as $content_type => $value) {

    // This should mean that the rest of this loop will not be called if the
    // content_type was not selected.
    if ($value == 0) {
      continue;
    }
    $file_name = format_date(REQUEST_TIME, 'custom', 'Ymd_His') . "_nodes_" . $content_type . ".dataset";
    $file_path_and_name = $dataset_directory . "/" . $file_name;

    // Rebuild is needed to flush out content types which may have been deleted.
    node_types_rebuild();
    $node_types = node_type_get_types();

    // Save the content type variable to the file. By serializing the
    // variable we will change it to a character based format which is
    // safe to be output to a file.  This is made safer then by being
    // base64 encoded to make sure line endings and other characters
    // do not cause issues on importing the dataset.
    $content_type_data_serialized = serialize($node_types[$content_type]);
    $content_type_data_serialized_and_encoded = base64_encode($content_type_data_serialized);
    file_unmanaged_save_data($content_type_data_serialized_and_encoded . "\n", $file_path_and_name, FILE_EXISTS_REPLACE);

    // Here we will loop through the fields in the content type and
    // look for fields which are of type 'file'.  We will then send an
    // array of these fields into the
    // data_export_import_batch_export_nodes_to_file function - this
    // will mean that the
    // data_export_import_batch_export_nodes_to_file function will
    // know which are the file fields so it can store the file data.
    $fields_of_type_file = array();
    $fields_info = field_info_instances('node', $content_type);
    foreach ($fields_info as $field_name => $field_value) {
      $field_info = field_info_field($field_name);
      $type = $field_info['type'];
      if ($type == 'file' || $type == 'image') {
        $fields_of_type_file[] = $field_name;
      }
    }

    // Each content type being exported to a dataset file will be run
    // as a batch to prevent timeouts.
    $batch['operations'][] = array(
      'data_export_import_batch_export_nodes_to_file',
      array(
        $content_type,
        $file_path_and_name,
        $fields_of_type_file,
      ),
    );
  }

  // This is the key function which will set the batch up to be processed.
  batch_set($batch);

  // Since we are not calling this batch processing from a form we will need to
  // request that the batch is processed.
  batch_process('admin/config/system/data_export_import/nodes');
  return TRUE;
}