public function Book::query in Drupal 8

Same name and namespace in other branches

1. 9 core/modules/book/src/Plugin/migrate/source/Book.php \Drupal\book\Plugin\migrate\source\Book::query()

Return value

\Drupal\Core\Database\Query\SelectInterface

Overrides SqlBase::query

File

core/modules/book/src/Plugin/migrate/source/Book.php, line 20

Class

Book

Drupal 6 and 7 book source.

Namespace

Drupal\book\Plugin\migrate\source

Code

public function query() {
  $query = $this
    ->select('book', 'b')
    ->fields('b', [
    'nid',
    'bid',
  ]);
  $query
    ->join('menu_links', 'ml', 'b.mlid = ml.mlid');
  $ml_fields = [
    'mlid',
    'plid',
    'weight',
    'has_children',
    'depth',
  ];
  foreach (range(1, 9) as $i) {
    $field = "p{$i}";
    $ml_fields[] = $field;
    $query
      ->orderBy('ml.' . $field);
  }
  return $query
    ->fields('ml', $ml_fields);
}