getData

You define the data (aka rows) of the grid in the grid's getData() method:

public function getData()
{
  return wire()->pages->findRaw([
    'template' => 'yourtemplate'
  ], [
    'id',
    'title',
    'created',
  ], [
    'nulls' => true,
    'indexed' => false,
  ]);
}

Flatten

When dealing with more complex Fieldtypes (like a page reference field or an options field) that data returned from the findRaw() call can not directly be consumed from RockGrid. In that case we need to flatten the data from a nested array to a plain string:

  public function getData()
  {
    $data = $this->wire->pages->findRaw([
      'template' => RockMigrationsConstants::template_server,
    ], [
      'id',
      'title',
      RockMigrationsConstants::field_os . '.title',
      RockMigrationsConstants::field_hoster . '.title',
    ], [
      'nulls' => true,
      'indexed' => false,
    ]);

    foreach ($data as &$row) {
      $row['os'] = RockGrid::flatten($row['os']);
      $row['hoster'] = RockGrid::flatten($row['hoster']);
    }

    return $data;
  }