How to (de-)serialize a list of objects? - json

Question

I found an example of JSON serialization and deserialization to objects in Flutter
but how to do that with a list of persons like:
[
{
"name": "John",
"age": 30,
"cars": [
{
"name": "BMW",
"models": [
"320",
"X3",
"X5"
]
}
]
},
{
"name": "John",
"age": 30,
"cars": [
{
"name": "Ford",
"models": [
"Fiesta",
"Focus",
"Mustang"
]
}
]
}
]
When I call _person = serializers.deserializeWith(Person.serializer, JSON.decode(json)); I get this error:
The following _CastError was thrown attaching to the render tree:
type '_InternalLinkedHashMap<String, dynamic>' is not a subtype of type 'String' in type cast where
_InternalLinkedHashMap is from dart:collection
String is from dart:core
String is from dart:core
I created a surrounding Persons class:
abstract class Persons implements Built<Persons, PersonsBuilder> {
BuiltList<Person> get persons;
Persons._();
factory Persons([updates(PersonsBuilder b)]) = _$Persons;
static Serializer<Persons> get serializer => _$personsSerializer;
}
and call _person = serializers.deserializeWith(Persons.serializer, JSON.decode(json)); but the error is the same.
How to (de-)serialize a Json list of objects?

Answer 1

Instead of
_person = serializers.deserializeWith(Person.serializer, JSON.decode(json));
Try
_person = serializers.deserializeWith(Person.serializer, (JSON.decode(json) as List).first);
Or
var personList = (JSON.decode(json) as List).map((j) => serializers.deserializeWith(Person.serializer, j)).toList();