/**
* Remove Directus-managed virtual/alias fields from the table schema array
* and return them as a separate array.
* @param array $schema Table schema array.
* @return array Alias fields
*/
public function filterSchemaAliasFields(&$schema)
{
$alias_fields = [];
foreach ($schema as $i => $col) {
// Is it a "virtual"/alias column?
if (TableSchema::isColumnAnAlias($col)) {
// Remove them from the standard schema
unset($schema[$i]);
$alias_fields[] = $col;
}
}
return $alias_fields;
}