getDairas method
Returns list of Daira object
this method looks for every daira in this wilaya and return the result as list of Daira
Implementation
List<Daira?>? getDairas() {
return algeria_cites
.where((element) => (element['wilaya_name_ascii'] == data!['wilaya_name_ascii']) && (element['daira_name'] == element['commune_name']))
.map((e) => Daira(data: e))
.toSet()
.toList();
}