I have and object and I wondering if there is a simple way to iterate through it keys and values?
class Post {
String id;
String title;
String article;
Post(
{
this.id,
this.title,
this.article
}
);
}
There is not.
What you are asking for is reflection. You can use the dart:mirrors API for that, if the library is available on your platform (it's not in Flutter).
You might be able to generate code for it by using package:reflectable.
Or you can use package:json_serializable to generate a Map from an object.
If you are just trying to do something for one particular class, I'd just manually
write:
dart
Map<String, dynamic> toJson() => {"id": id, "title": title, "article": article};
and then use that when you want to iterate.
This bugs me almost every day. It's also a problem on the web-side of Dart. In my opinion this is one of the major shortcomings of Dart...
However - here is my solution. I'm using a interface class for these "serializable" classes.
abstract class JsonTO {
Map<String, dynamic> toJson();
}
class Device implements JsonTO {
Map<String, dynamic> toJson() {
return ... Your serialization thing
}
}
main() {
final device = Device();
final json = device.toJson();
json.forEach((final String key, final value) {
_logger.info("Key: {{$key}} -> value: ${value}");
// do with this info whatever you want
});
}
You could also use a getter? It will require you to set up all of the fields once, but after that, you can call the complete list of fields and iterate through that.
class Person{
final String _firstName;
final String _secondName;
Person(this._firstName,this._secondName);
String get hisName{
return _firstName;
}
}
class Player extends Person{
final int _shirtNumber;
Player(String _firstName,String _secondName,this._shirtNumber) : super(_firstName, _secondName);
List get everything{
final stuff=[_firstName,_secondName,_shirtNumber];
return stuff;
}
}
void main(List<String> arguments) {
final foo = Player('David','Beckham',7);
print(foo.everything);
for (final blah in foo.everything){
print(blah);
}
}
All you have to do the name the object in which you have all properties e.g
var object = { this.id,
this.title,
this.article }
for (var property in object) {
if (object.hasOwnProperty(property)) {
// do stuff
}
}
