Json_serializable.dart: Support custom DateTime formats

[westy92]

I'd like to (un)serialize a DateTime in a custom format, such as:

 new DateFormat('M/d/yyyy');

Currently I get a runtime exception:

I/flutter (20794): FormatException: Invalid date format
I/flutter (20794): 04/10/2015

[westy92]

Is it possible using a method like this?

[thosakwe]

I think that the TypeHelper functionality could potentially solve this for you. I'm not 100% sure how to use it, but it seems like once it's documented it'll be a possibility.

[kevmoo]

This will be easily solved with https://github.com/dart-lang/json_serializable/pull/146

[kevmoo]

See here for how you can get this done w/out creating a custom TypeHelper.

https://github.com/dart-lang/json_serializable/blob/bb96ddc0c241d07879d06f2209a210d2e73df31b/json_serializable/test/test_files/json_test_example.dart#L125-L151

Will be published soon!

[westy92]

Thanks! I got this to work. Leaving a DateTime with a custom format example for others:

@JsonSerializable()
class Test extends Object with _$TestSerializerMixin {

  @JsonKey(fromJson: _fromJson, toJson: _toJson)
  final DateTime date;

  Test({
    this.date,
  });

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

final _dateFormatter = new DateFormat('M/d/yyyy');
DateTime _fromJson(String date) => _dateFormatter.parse(date);
String _toJson(DateTime date) => _dateFormatter.format(date);

[kevmoo]

So glad!

On Thu, May 10, 2018, 21:57 Seth Westphal [e-mail] wrote:

Thanks! I got this to work. Leaving a DateTime with a custom format
example for others:

@JsonSerializable()class Test extends Object with _$TestSerializerMixin {

@JsonKey(fromJson: _fromJson, toJson: _toJson)
final DateTime date;

Test({
this.date,
});

factory Test.fromJson(Map json) => _$TestFromJson(json);
}
final _dateFormatter = new DateFormat('M/d/yyyy');DateTime _fromJson(String date) => _dateFormatter.parse(date);String _toJson(DateTime date) => _dateFormatter.format(date);

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[tulioccalazans]

Ah, its gotta be a static member.

static final _dateFormatter = DateFormat('M/d/yyyy');
static DateTime _fromJson(String date) => _dateFormatter.parse(date);
static String _toJson(DateTime date) => _dateFormatter.format(date);