loadCategory function
Implementation
Future<String?> loadCategory() async{
try{
var querySnapshot = await FirebaseFirestore.instance.collection("category").get();
categories = [];
for (var result in querySnapshot.docs) {
var _data = result.data();
var t = CategoryData.fromJson(result.id, _data);
categories.add(t);
}
// addStat("categories", parent.categories.length);
}catch(ex){
return "loadCategory " + ex.toString();
}
return null;
}