CODEWITHSUNDEEP
flutterdartjson-serializable
BeniaminoBaggins
BeniaminoBaggins

Reputation: 12433

Methods on JsonSerializable classes causing error

When I add the getter color below, it doesn't create fromJson method anymore. I get this error when I run my app:

Error: Method not found: 'Alert.fromJson'.

How come? I thought @JsonKey(ignore: true) would ignore it? Can I not put methods on JsonSerialzable classes?

import 'package:equatable/equatable.dart';
import 'package:flutter/material.dart';
import 'package:json_annotation/json_annotation.dart';
import 'package:new_day_flutter/domain/entity/alert/alert_enum.dart';
import 'package:new_day_flutter/domain/entity/alert/alert_severity.dart';
import 'package:new_day_flutter/presentation/theme/palette.dart';

part 'alert.g.dart';

@JsonSerializable(constructor: '_', createFactory: true)
class Alert extends Equatable {
  final AlertEnum alert;
  final DateTime time;
  final AlertSeverityEnum severity;

  const Alert._(
      {required this.alert, required this.time, required this.severity});

  factory Alert.highAlarm({required DateTime time}) {
    return Alert._(
        alert: AlertEnum.highAlarm,
        time: time,
        severity: AlertSeverityEnum.medium);
  }

  factory Alert.lowAlarm({required DateTime time}) {
    return Alert._(
        alert: AlertEnum.lowAlarm,
        time: time,
        severity: AlertSeverityEnum.medium);
  }

  factory Alert.lockout({required DateTime time}) {
    return Alert._(
        alert: AlertEnum.lockout, time: time, severity: AlertSeverityEnum.high);
  }

  factory Alert.solutionLow({required DateTime time}) {
    return Alert._(
        alert: AlertEnum.solutionLow,
        time: time,
        severity: AlertSeverityEnum.low);
  }

  @JsonKey(ignore: true)
  Color get color {
    if (severity == AlertSeverityEnum.high) {
      return errorRed;
    }
    if (severity == AlertSeverityEnum.medium) {
      return warningOrange;
    }
    if (severity == AlertSeverityEnum.low) {
      return bluelabBlue;
    }

    return bluelabBlue;
  }

  @override
  List<Object> get props => [alert, time, severity];

  Map<String, dynamic> toJson() => _$AlertToJson(this);
}

Upvotes: 2

Views: 1202

Answers (1)

Nitrodon
Nitrodon

Reputation: 3435

json_serializable will generate an implementation of fromJson, but it can't add a factory or static method to your class. You'll have to create the factory yourself (and let the generated implementation do all the real work):

  factory Alert.fromJson(Map<String, dynamic> json) => _$AlertFromJson(json);

You may have accidentally deleted that code somehow when you added the color getter.

Upvotes: 2

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