/**
* Set where to fetch which columns
*
* This notifies the repository about each desired query column.
*
* @param mixed $target The target from which to fetch the columns
* @param array $columns If null or an empty array, all columns will be fetched
*
* @return $this
*/
public function from($target, array $columns = null)
{
$this->query = $this->repository->getDataSource()->select();
$this->query->from($this->repository->requireTable($target, $this));
$this->query->columns($this->prepareQueryColumns($target, $columns));
$this->target = $target;
return $this;
}
