/**
* Resolve the given columns supposed to be fetched
*
* This notifies the repository about each desired query column.
*
* @param mixed $target The target where to look for each column
* @param array $desiredColumns Pass null or an empty array to require all query columns
*
* @return array The desired columns indexed by their respective alias
*/
protected function prepareQueryColumns($target, array $desiredColumns = null)
{
$this->customAliases = array();
if (empty($desiredColumns)) {
$columns = $this->repository->requireAllQueryColumns($target);
} else {
$columns = array();
foreach ($desiredColumns as $customAlias => $columnAlias) {
$resolvedColumn = $this->repository->requireQueryColumn($target, $columnAlias, $this);
if ($resolvedColumn !== $columnAlias) {
if (is_string($customAlias)) {
$columns[$customAlias] = $resolvedColumn;
$this->customAliases[$customAlias] = $columnAlias;
} else {
$columns[$columnAlias] = $resolvedColumn;
}
} elseif (is_string($customAlias)) {
$columns[$customAlias] = $columnAlias;
$this->customAliases[$customAlias] = $columnAlias;
} else {
$columns[] = $columnAlias;
}
}
}
return $columns;
}
/**
* Return this repository's query columns of the given table mapped to their respective aliases
*
* @param array|string $table
*
* @return array
*
* @throws ProgrammingError In case $table does not exist
*/
public function requireAllQueryColumns($table)
{
return parent::requireAllQueryColumns($this->removeTablePrefix($this->clearTableAlias($table)));
}
