Use freezed on class that has a Color member in it

[ToddManUtah]

I want to create a model called "Categories" and make it compatible with to/fromJson. It will have 2 fields: String name and Color color. When I use freezed, I can get the following code to generate:

import 'dart:ui';
import 'package:flutter/material.dart';
import 'package:freezed_annotation/freezed_annotation.dart';

part 'category.freezed.dart';
part 'category.g.dart';

@freezed
class Category with _$Category {
  const factory Category({
    required String name,
    @JsonKey(includeFromJson: false, includeToJson: false) Color? color,
  }) = _Category;

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

I have 2 problems:

1. I'd like to assign a default color to "color" and not make it optional. I can't seem to get this to work.
2. I'd also like to remove the named parameters. But when I remove the curly brackets, I get the following error:

code:

import 'dart:ui';
import 'package:flutter/material.dart';
import 'package:freezed_annotation/freezed_annotation.dart';

part 'category.freezed.dart';
part 'category.g.dart';

@freezed
class Category with _$Category {
  const factory Category(
    required String name,
    @JsonKey(includeFromJson: false, includeToJson: false) Color? color,
  ) = _Category;

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

error:
This builder requires Dart inputs without syntax errors.
However, package:shopping_list/models/category.dart (or an existing part) contains the following errors.
category.dart:24:5: Can't have modifier 'required' here.

If I remove the "required" in front of String name, I get the following error:
Cannot populate the required constructor argument: color. It is assigned to a field not meant to be used in fromJson.
package:shopping_list/models/category.freezed.dart:114:9
╷
114 │ const _$_Category(this.name,

Like I said, I'd like to exclude Color color from the to/fromJson but I'd like to give it a default value so that it's not optional. Any ideas?

[rrousselGit]

The problem is that your name parameter is "required" but it isn't "named". You're missing the {}

Do:

const factory Category({required String name, ...}) = _Category;`

[ToddManUtah]

Is there a way of doing this WITHOUT using named parameters? In other words, I'd like to use positional arguments/parameters:

ie: Category('meat') & Category('dairy', Colors.blue) VS Category(name: 'meat') & Category(name: 'dairy', color: Colors.blue)

When I remove the curly braces AND remove 'required' from in front of name, I get the following error:
Cannot populate the required constructor argument: color. It is assigned to a field not meant to be used in fromJson.
package:shopping_list/models/category.freezed.dart:114:9
╷
114 │ const _$_Category(this.name,

[rrousselGit]

Don't specify the required keyword then. The error you shared initially has nothing to do with Color or Freezed. It's simply not valid Dart code

As for fromJson, Color is not serializable. If you want a from/toJson, you'll need a custom JsonConverter

[ToddManUtah]

BTW: Thanks for all the work you do. I've been using Riverpod extensively and have trained my whole development team how and where to use it. I thought I'd experiment with Freezed and it's really awesome as well. Thanks again for all your hard work.