serializeColumns static method
convert tableColumns into List of Map
Implementation
static List<Map> serializeColumns(List list) {
var rslts = <Map>[];
for (Object m in list) {
if (m is Map) {
rslts.add(m);
} else if (m is TableColumn) {
rslts.add(m.getData());
}
}
return rslts;
}