using json serializable on a received array instead of an object - Is it possible ?

[Adam Zedan]

I am currently receiving something like this as json

[

  {

    "employee": {

      "user": {

        "first_name": "...",

        "last_name": "Mob",

      },

      "employee_zip": 12345,

    },

    "imageA": "http://127.0.0.1:8000/media/images/patient_images/blank.jpeg",

  }

]

Notice the above is an array and not an object. This is what my dart file looks like

@JsonSerializable()
class myList extends Object with _$myListSerializerMixin {

    @JsonKey(name: "")
    final List<myResponse> response;

    myList(this.response);

    factory myList.fromJson(Map<String, dynamic> json) =>
            _$portfolioResponseListFromJson(json);
}

Now when I try to do the following 

myList foo = myList.fromJson(json.decode(response));

I get the exception:

[VERBOSE-2:dart_error.cc(16)] Unhandled exception:

type 'List<dynamic>' is not a subtype of type 'Map<String, dynamic>' where

  List is from dart:core

  Map is from dart:core

  String is from dart:core

Any suggestions on how I can fix this ?

[Thetyne]

you need multiple class like :

class Employe

{

Employe(...);

User user;

}

class User

{

User (...);

String first_name;

String last_name;

}

class Foo{

Foo(...)

Employe employee;

String imageA;

}

and after serialization ((each class need serializable attribute and internal parser):

final parsed = json.decode(response).cast<Map<String, dynamic>>();

List<Foo> fooList = parsed.map<Foo>((json) => new Foo.fromJson(json)).toList();

[Kris Giesing]

If I'm understanding the situation, then I think that cast will fail? If the decoded JSON object really is a list, not a map, it's the List.cast method that would be invoked.

To the OP: I think your fromJson method needs to take dynamic, and do something different depending on whether the input is a list or a map. You can use the type test operators for this kind of thing. I'm not entirely sure what you want out of the JSON list, but you could for example extract the first element of the list and use that for the map your method originally required.

Note that this is more a general Dart question than a Flutter question.

Hope this helps,

- Kris

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[Kris Giesing]

@Thetyne: Whoops, actually, I misinterpreted what you wrote. You're casting the list to a list of maps, which would also work.