Flutter: How i can make List for messages? - flutter

Question

I need to make a list of messages, I have this model
enum MessageType {sent, received}
class Messages {
MessageType status;
String contactName;
String message;
String time;
Messages({ this.status, this.message, this.contactName, this.time});
}
And this way to make a list
final response = await http.get(url);
if(response.statusCode == 200){
print(response.body);
var allMessages = (json.decode(response.body) as Map)['messages'] as Map<String, dynamic>;
var MessagesList = List<Messages>();
allMessages.forEach((String key, dynamic val){
var record = Messages(contactName: val['ownerName'], message: val['body'], time: '123', status: );
});
I have two questions.
How can I substitute the value 'received' in status?
2.how to set received or sent depending on which id?
If id = 1, then put 'received', if other then put 'sent'

Answer 1

You should do something like this.
Convert your JSON to a List of Message using a custom "fromJson" method and, during the conversion, set the MessageType as needed.
enum MessageType { sent, received }
class Message {
MessageType status;
String contactName;
String message;
String time;
Message({this.status, this.message, this.contactName, this.time});
factory Message.fromJson(Map<String, dynamic> json) => Message(
status: json["status"] == 1 ? MessageType.received : MessageType.sent,
contactName: json["contactName"],
message: json["message"],
time: json["time"],
);
}
Future<List<Message>> getMessage() async {
final response = await http.get(url);
if (response.statusCode == 200) {
print(response.body);
List<Message> allMessages = List<Message>.from(
json.decode(response.body).map((x) => Message.fromJson(x)));
return allMessages;
}
}

Answer 2

You should be able to just use an inline ternary operator like this: testCondition ? trueValue : falseValue
implemented in your code would look like this:
allMessages.forEach((String key, dynamic val){var record = Messages(
contactName: val['ownerName'],
message: val['body'],
time: '123',
status: id==1 ? MessageType.received : MessageType.sent);
});
Hope this helps!