Printing my List is fine in the terminal but when I want to save it to the Cache, I am getting this error :

Error: The argument type 'List<Map<String, dynamic>>' can't be assigned to the parameter type 'List<String>'.

The Error is pointing towards :

await WriteCache.setListString(key: 'cache4', value: incidentList);

This is my code :

onTap: () async {
                  var newMessage = await (ReadCache.getString(key: 'cache1'));

                  var response = await http.get(
                    Uri.parse(
                        'http://192.168.1.8:8080/HongLeong/MENU_REQUEST.do?_dc=1658076505340&reset_context=1&table_id=25510&id_MenuAction=3&path=
Loss Event
&ViewType=MENU_REQUEST&gui_open_popup=1&id_Window=17&activeWindowId=mw_17&noOrigUserDate=true&LocalDate=20220718&LocalTime=00482500&TimeZone=Asia/Shanghai&UserDate=0&UserTime=0&server_name=OPRISK_DATACOLLECTOR&key_id_list=&cell_context_id=0&id_Desktop=100252&operation_key=1000184&operation_sub_num=-1&is_json=1&is_popup=0&is_search_window=0&ccsfw_conf_by_user=0&is_batch=0&previousToken=1658069547560&historyToken=1658076505339&historyUrl=1'),
                    headers: {HttpHeaders.cookieHeader: newMessage},
                  );

                  LossEventResponseModel lossEventResponseModel =
                  LossEventResponseModel.fromJson(jsonDecode(response.body));

                  final listNode = lossEventResponseModel.response.genericListAnswer.listNode;

                  List<Map<String, dynamic>> incidentList = [
                    for (final json in listNode.map((x) => x.toJson()))
                      {
                        'Code': json['field'][0]['field_value'],
                        'Description': json['field'][1]['field_value'],
                        'Organisation Unit': json['field'][46]['field_value'],
                        'Date Reported': json['field'][18]['field_value'],
                      }
                  ];

                  await WriteCache.setListString(key: 'cache4', value: incidentList);
                  print(incidentList);



                  Navigator.of(context).push(
                      MaterialPageRoute(builder: (context) => const LossEvent()));
                },

This is what I am printing :

 [{Code: LE-0000000002, Description: test_01, Organisation Unit: 01_01_04_01_SA - Shah Alam, Date Reported: 18/09/2020}, {Code: LE-0000000003, Description: Transactions not reported (intentional), Organisation Unit: 01_01_04_01_HQ - Menara Hong Leong, Damansara City, Date Reported: 03/02/2018},and so on.....

I would really love to display it as :

Code: LE-0000000002,
Description: test_01,
Organisation Unit: 01_01_04_01_SA - Shah Alam,
Date Reported: Date Reported: 18/09/2020,

but the error is stopping me from doing so. Any advice on fixing my code would be great!

CodePudding user response：

You can check setListString takes key and list of String

 static Future setListString(
      {required String key, required List<String> value})

But you are trying to put list of map

List<Map<String, dynamic>> incidentList

You can do something like

final List<String>values =  [];

for(final item in incidentList){
values.addAll(item.values.map((e) => e.toString()));
}
await WriteCache.setListString(key: 'cache4', value: values);

More about cache_manager

CodePudding user response：

Storing the List

WriteCache.setListString() expects a value of type List<String>, but incidentList has the type List<Map<String, dynamic>>.

Instead, consider encoding your list as JSON, and store it using WriteCache.setString():

// Top of file:
import 'dart:convert';

// In onTap:
final incidentListJson = jsonEncode(incidentList);
await WriteCache.setString(key: 'cache4', value: incidentListJson);

Note: When reading the cache, you will also need to use decodeJson to convert the JSON string back into a list:

final incidentListJson = await ReadCache.getString(key: 'cache4');
final List incidentList = jsonDecode(incidentListJson);

Formatting the List

If you'd like the list to be formatted in the way you showed, you can define a function for that:

String formatIncidentList(List<Map<String, dynamic>> list) {
  return list.map(
    (incident) => incident.entries.map(
      (entry) => "${entry.key}: ${entry.value},"
    ),
  ).join("\n");
}

// Usage:
print(formatIncidentsList(incidentList));