Feature/#130 custom enum field

[jorre127]

fixes #130

[vanlooverenkoen]

Tested this:

DoubleStatus:
  path: status
  type: enum
  properties:
    value:
      type: double
      is_json_key: true
  values:
    status_0:
      properties:
        value: 0.1
    status_1:

and it gave me this:

// GENERATED CODE - DO NOT MODIFY BY HAND

import 'package:json_annotation/json_annotation.dart';

enum DoubleStatus {
  @JsonValue(0.1)
  STATUS_0(
    value: 0.1,
  ),
  @JsonValue(null)  <================ error ====================>
  STATUS_1(
    value: null, <================ error ====================>
  );

  final double value;

  const DoubleStatus({
    required this.value,
  });
}

[vanlooverenkoen]

rename is_json_key to is_json_value

[vanlooverenkoen]

Why is this deprecated? Because the map is still needed. but it should use the values fields from the enum values instead. Otherwise we will have to write our own mapping each time we want to map something. Keeping this logic will make it the same for all projects

[ikbendewilliam]

There is an issue with the lowercasing in enum names
This config results in this dart code:

    inBrowser:
      properties:
        value: inBrowser

  @JsonValue('inBrowser')
  inbrowser(
    value: 'inBrowser',
  );

I would expect inbrowser to still have a capital B

[ikbendewilliam]

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