File field feeds - field collection https://www.drupal.org/node/1063434

feeds_file_field_collection.php

/**
 * Implements hook_feeds_processor_targets_alter().
 *
 * Overrides the file.inc mapping to correctly set the allowed extensions for
 * files inside field collections.
 */
function {my_module}_feeds_processor_targets_alter(array &$targets, $entity_type, $bundle) {
  if ($bundle == 'field_files_collection') {
    foreach ($targets as $target_id => &$target) {
      if ((isset($target['real_target'])) && $target['real_target'] == 'field_file') {
        if ($target_id == 'field_file:uri') {
          $target['callback'] = '{my_module}_file_feeds_set_target';
        }
      }
    }
  }
}

/**
 * Callback for mapping file fields inside field_collections.
 *
 * @see file_feeds_set_target()
 */
function {my_module}_file_feeds_set_target(FeedsSource $source, $entity, $target, array $values) {
  // Add default of uri for backwards compatibility.
  list($field_name, $sub_field) = explode(':', $target . ':uri');
  $info = field_info_field($field_name);

  // We're acting for uris only.
  if ($sub_field != 'uri') {
    return;
  }

  foreach ($values as $k => $v) {
    if (!($v instanceof FeedsEnclosure)) {
      if (is_string($v)) {
        $values[$k] = new FeedsEnclosure($v, file_get_mimetype($v));
      }
      else {
        // Set the value for FALSE rather than remove it to keep our deltas
        // correct.
        $values[$k] = FALSE;
      }
    }
  }

  $entity_type = $entity->entityType();
  $bundle = $entity->bundle();
  $instance_info = field_info_instance($entity_type, $field_name, $bundle);

  // Determine file destination.
  // @todo This needs review and debugging.
  $data = array();
  if (!empty($entity->uid)) {
    $data[$entity_type] = $entity;
  }

  $destination = file_field_widget_uri($info, $instance_info, $data);


  // Populate entity.
  $field = isset($entity->$field_name) ? $entity->$field_name : array(LANGUAGE_NONE => array());
  $delta = 0;
  foreach ($values as $v) {
    if ($info['cardinality'] == $delta) {
      break;
    }

    if (!isset($field[LANGUAGE_NONE][$delta])) {
      $field[LANGUAGE_NONE][$delta] = array();
    }


    if ($v) {
      try {
        $v->setAllowedExtensions($instance_info['settings']['file_extensions']);
        $field[LANGUAGE_NONE][$delta] += (array) $v->getFile($destination);
        // @todo: Figure out how to properly populate this field.
        $field[LANGUAGE_NONE][$delta]['display'] = 1;
      }
      catch (Exception $e) {
        watchdog('feeds', check_plain($e->getMessage()));
      }
    }

    $delta++;
  }

  $entity->$field_name = $field;
}


/**
 * Implements hook_module_implements_alter().
 */
function {my_module}_module_implements_alter(&$implementations, $hook) {
  switch ($hook) {
    case 'feeds_processor_targets_alter':
      // Move some of our hook implementations to the end of the list.
      $group = $implementations['{my_module}'];
      unset($implementations['{my_module}']);
      $implementations['{my_module}'] = $group;
      $hola = 1;
      break;
  }
}