public function export()
{
$export_dir = Kohana::$cache_dir . DIRECTORY_SEPARATOR . 'exports';
@mkdir($export_dir);
$filename = $export_dir . DIRECTORY_SEPARATOR . uniqid() . '.csv';
if (Kohana::$is_windows) {
$filename = str_replace('\\', '/', $filename);
}
$headers_query = new Database_Query_Builder_Select();
$data_query = new Database_Query_Builder_Select();
$headers_query->union($data_query);
$alias_num = 1;
foreach ($this->get_columns() as $col) {
$header = "'" . WebDB_Text::titlecase($col->get_name()) . "'";
$headers_query->select(DB::expr($header));
if ($col->is_foreign_key()) {
$fk1_alias = "e{$alias_num}";
$alias_num++;
$fk1_table = $col->get_referenced_table();
$data_query->join(array($fk1_table->get_name(), $fk1_alias), 'LEFT OUTER');
$data_query->on($this->get_name() . '.' . $col->get_name(), '=', "{$fk1_alias}.id");
$select = $fk1_alias . '.' . $fk1_table->get_title_column()->get_name();
if ($fk1_table->get_title_column()->is_foreign_key()) {
$fk2_alias = "e{$alias_num}";
$alias_num++;
$fk2_table = $fk1_table->get_title_column()->get_referenced_table();
$data_query->join(array($fk2_table->get_name(), $fk2_alias), 'LEFT OUTER');
$data_query->on($fk1_alias . '.' . $fk1_table->get_title_column()->get_name(), '=', "{$fk2_alias}.id");
$select = $fk2_alias . '.' . $fk2_table->get_title_column()->get_name();
}
} else {
$select = $this->get_name() . '.' . $col->get_name();
}
$data_query->select(DB::expr("REPLACE(IFNULL({$select}, ''),'\r\n', '\n')"));
}
$data_query->from($this->get_name());
$this->add_get_filters();
$this->apply_filters($data_query);
$data_query->outfile($filename);
$headers_query->outfile();
$headers_query->execute($this->_db);
if (!file_exists($filename)) {
throw new Kohana_Exception("Export file not created: {$filename}");
}
return $filename;
}
