getExpense function
Implementation
Future<int> getExpense() async {
int amount = 0;
final results = await getRecords("expenses");
List items = results.items;
for (var element in items) {
amount = (amount + element.data['amount']) as int;
c.userPersonalAnalysis.addIf(!c.userPersonalAnalysis.containsValue(amount), "expense",amount);
}
return amount;
}