Annoying json_serializable bug

[jhionan]

On my production project freezed is not generating g.dart file, the problem is that I could not reproduce this bug on a test project.

Creating a test project everything works fine, copying the working fine class of test to production and the .g.dart is not generated.

I tried do add all pubspec dependencies of production project at test project, and test still working.
json_serializable classes is working well when not generated by freezed.

I dont know what to do to find this bug, any idea?

[rrousselGit]

Without having some code to reproduce the error I cannot help you

A quick check though:
Freezed doesn't generate .g.dart but .freezed.dart.
Did you use the right part?

[jhionan]

This is the annoying part, freezed.dart is being generated, and it have the expected @JsonSerializable() annotations. I try to dig deeper, but i couldn't reproduce it into a new project (because it works).

…

On Thu, 13 Feb 2020, 00:27 Remi Rousselet, ***@***.***> wrote: Without having some code to reproduce the error I cannot help you A quick check though: Freezed doesn't generate .g.dart but .freezed.dart. Did you use the right part? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#29?email_source=notifications&email_token=AJAO2XKPN3TRRZWD52VODELRCS43LA5CNFSM4KUIL7O2YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOELTIEOI#issuecomment-585531961>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AJAO2XIP274SID26S7CRDLLRCS43LANCNFSM4KUIL7OQ> .

[rrousselGit]

It may have something to do with the package versions.

build_runner didn't support having a generator outputting dart code for another generator until last week.

[jhionan]

tried to force a version on build_runner, is not that. build_runner dont send any error feedback when generating stuffs.

dev_dependencies: flutter_test: sdk: flutter json_annotation: ^3.0.1 build_runner: ^1.7.4 mockito: 4.1.1 mobx_codegen: ^1.0.1 json_serializable: ^3.2.5 freezed: ^0.2.4

I just used your example:
`import 'package:flutter/foundation.dart';
import 'package:json_annotation/json_annotation.dart';

part 'aaa.freezed.dart';
part 'aaa.g.dart';

@immutable
abstract class Model with _$Model {
factory Model.first(String a) = First;
factory Model.second(int b, bool c) = Second;

factory Model.fromJson(Map<String, dynamic> json) => _$ModelFromJson(json);
}`

and still not generating .g.dart.

[rrousselGit]

I see that you're using mobx_codegen. What happens if you remove it?

[rrousselGit]

Also, could you try adding the following file at the root of your project?

# build.yaml
targets:
  $default:
    builders:
      freezed|freezed:
        enabled: false


builders:
  freezed:
    import: "package:freezed/builder.dart"
    builder_factories: ["freezed"]
    build_extensions: { ".dart": [".freezed.dart"] }
    auto_apply: dependents
    build_to: source
    runs_before:
      - json_serializable|json_serializable
      - source_gen|combining_builder

[jhionan]

after this build yaml .freezed.dart stopped get generated too. but this can be a clue because I have a build.yaml for json_serializable.
I `ll try a consistent way to reproduce.

[nonoyona]

On my production project freezed is not generating g.dart file, the problem is that I could not reproduce this bug on a test project.

Creating a test project everything works fine, copying the working fine class of test to production and the .g.dart is not generated.

I tried do add all pubspec dependencies of production project at test project, and test still working.
json_serializable classes are working well when not generated by freezed.

I don't know what to do to find this bug, any idea?

I am having the same issue

Edit: never mind, I just ran pub upgrade and it worked

[jhionan]

Already tried to comment all dependences that could generate stuffs..

So far no good =/

Next test: comment ALL dependences of project and see if it will generate.

[rrousselGit]

Sadly I can't do much to help here.

Consider uploading your pubspec.lock and potentially use dependency_overrides to ensure that the version of build_runner+co is the right one

[jhionan]

Sadly I can't do much to help here.

Consider uploading your pubspec.lock and potentially use dependency_overrides to ensure that the version of build_runner+co is the right one

It worked!!!

Just deleted pubspec.lock, I guess build_runner was with an old version, even forcing it on pubspec.

Tks so much!

[viktordineout]

None of the above worked for me. This fixed it:

A note which I found in the Freezed readme:

Note:
Freezed will only generate a fromJson if the factory is using =>.

My fromJson function had a body which was defaulting values with putIfAbsent. When replacing the body with the fat arrow, I needed another place to default a value, which I did like so: @Default([]) List<String> staffLogs, in the constructor.

Hope this helps anyone.