More than one field has the JSON key `item`.

[fatherchill]

Unsure if this is a new feature or just a case of not understanding how to use it correctly.

I use xml2json to convert an xml into Google Data json. A 'section' has one or more 'item' children. If there is only one, it becomes an Object property. If there are multiple, an Array.

Currently I have: @jsonkey(name: "item", nullable: true)
final List items;

But it throws an error when encountering an item Object.

Is there any way to ensure that a single Item Object will get serialized into a , or is there another way of handling this?

[kevmoo]

We recently added fromJson, toJson properties to JsonKey that let you provide methods to handle conversion yourself. You could detect if the value is a list or a single value and populate the property accordingly.

[fatherchill]

Thanks, I appreciate the clarification. I know this isn't a help forum, but for the life of me I can't figure out what syntax I need to use with the fromJson and there isn't really any documentation for those functions. You mind helping me understand how I can use fromJson to handle either a list or a single item in the following case?

@JsonKey(name: 'book',)
 final List<Book> books;

 BooksContainer(
     this.books,
     );

[kevmoo]

Something like

List<Book> _decodeBooks(Object input) {
  // your code here
}

class MyClass {
  @JsonKey(name: 'book', fromJson: _decodeBooks)
  final List<Book> books;
}

[fatherchill]

Thanks -- it took a bit for me to understand, but it's working now!

…

On 06/07/2018 11:11 PM, Kevin Moore wrote: Something like List<Book> _decodeBooks(Object input) { // your code here } class MyClass { @jsonkey(name: 'book', fromJson: _decodeBooks) final List<Book> books; } — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#165 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AKIP-dn4oSOcaHl6ayYMkXsNlzYK-8tXks5t6YjigaJpZM4UFm_G>.

[kevmoo]

Awesome! On Sun, Jun 10, 2018, 07:30 Christopher Hill <notifications@github.com> wrote:

…

Thanks -- it took a bit for me to understand, but it's working now! On 06/07/2018 11:11 PM, Kevin Moore wrote: > > Something like > > List<Book> _decodeBooks(Object input) { > // your code here > } > > class MyClass { > @jsonkey(name: 'book', fromJson: _decodeBooks) > final List<Book> books; > } > > — > You are receiving this because you authored the thread. > Reply to this email directly, view it on GitHub > < #165 (comment)>, > or mute the thread > < https://github.com/notifications/unsubscribe-auth/AKIP-dn4oSOcaHl6ayYMkXsNlzYK-8tXks5t6YjigaJpZM4UFm_G >. > — You are receiving this because you modified the open/close state. Reply to this email directly, view it on GitHub <#165 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AABCirA8MschvZ9u-H0_SFYGQcD2U4u2ks5t7S2WgaJpZM4UFm_G> .

[fatherchill]

I don't want to hastily open another issue. Yet after implementing fromJSON, debugging and running from Android Studio works fine, but release builds give a type mismatch error in my fromJSON method.

06-16 10:23:59.541 6695 6712 E flutter : [ERROR:topaz/lib/tonic/logging/dart_error.cc(16)] Unhandled exception:
06-16 10:23:59.541 6695 6712 E flutter : type '_OneByteString' is not a subtype of type 'int' of 'index'
06-16 10:23:59.541 6695 6712 E flutter : #0 _GrowableList.[] (dart:core/runtime/libgrowable_array.dart:0)

Is there a problem in my code or is this an actual issue?

The offending method is below and here is the repository: https://github.com/fatherchill/world_liturgy_app/tree/CalendarAndCollects

List<dynamic> _decodePrayerBookorService(itemOrList){
//  debugPrint(itemOrList);
  print('begin decode Prayerbook or Service');

  List<dynamic> list = [];
  if (itemOrList == null){
    return null;
  }
  if (itemOrList.runtimeType.toString() == 'List<dynamic>'){
    list = itemOrList;
  }else{
    list.add(itemOrList);
  }

  print(list.toString().substring(0,20));

  if (list.first['service'] != null){
    return list.map((e) =>
    e == null ? null : new PrayerBook.fromJson(e as Map<String, dynamic>))
        ?.toList();
  }else if (list.first['section'] != null){
    return list.map((e) =>
    e == null ? null : new Service.fromJson(e as Map<String, dynamic>))
        ?.toList();
  }else{
    return null;
  }

}

[kevmoo]

List<dynamic> list = [];
  if (itemOrList == null){
    return null;
  }
  if (itemOrList.runtimeType.toString() == 'List<dynamic>'){
    list = itemOrList;
  }else{
    list.add(itemOrList);
  }

Don't do that!

  if (itemOrList == null){
    return null;
  }
  List list;
  if (itemOrList.runtimeType.toString() == 'List<dynamic>'){
    list = itemOrList;
  }else{
    list = [itemOrList];
  }

Not sure if that'll help...but it's better...

[fatherchill]

Thanks. I appreciate the coding pointers though that wasn't the solution. The problem was that in the release build runtimeType returns '_GrowableList<dynamic>' while debug builds return 'List<dynamic>'.

…

On 06/16/2018 09:01 PM, Kevin Moore wrote: List<dynamic> list= []; if (itemOrList== null){ return null; } if (itemOrList.runtimeType.toString()== 'List<dynamic>'){ list= itemOrList; }else{ list.add(itemOrList); } Don't do that! if (itemOrList== null){ return null; } List list; if (itemOrList.runtimeType.toString()== 'List<dynamic>'){ list= itemOrList; }else{ list= [itemOrList]; } Not sure if that'll help...but it's better... — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#165 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AKIP-S7CWgZoxN2mmtRsczZQHql_QfrDks5t9UfmgaJpZM4UFm_G>.

[a-wallen]

For anyone else coming to this issue due to: More than one field has the JSON key for name <name>, you might be in this situation

class MyClass 
{
  SomeType A;

  @JsonKey(name: 'A')
  SomeType B;
}

It is possible if you are trying to rename a field on deserialization. You can solve it like this:

class MyClass 
{
  @JsonKey(ignore: true)
  SomeType A;

  @JsonKey(name: 'A')
  SomeType B;
}