loadCategory function

Future<String?> loadCategory()

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;
}