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Miguel Beltran 0305894b0e Compass App: Activities screen, error handling and logs (#2371) ... This PR introduces the Activities screen, handling of errors in view models and commands, and logs using the dart `logging` package. **Activities** - The screen loads a list of activities, split in daytime and evening activities, and the user can select them. - Server adds the endpoint `/destination/<id>/activitity` which was missing before. Screencast provided: [Screencast from 2024-07-29 16-29-02.webm](https://github.com/user-attachments/assets/a56024d8-0a9c-49e7-8fd0-c895da15badc) **Error handling** _UI Error handling:_ In the screencast you can see a `SnackBar` appearing, since the "Confirm" button is not yet implemented. The `saveActivities` Command returns an error `Result.error()`, then the error state is exposed by the Command and consumed by the listener in the `ActivityScreen`, which displays a `SnackBar` and consumes the state. Functionality is similar to the one found in [UI events - Consuming events can trigger state updates](https://developer.android.com/topic/architecture/ui-layer/events#consuming-trigger-updates) from the Android architecture guide, as the command state is "consumed" and cleared. The Snackbar also includes an action to "try again". Tapping on it calls to the failed Command `execute()` so users can run the action again. For example, here the `saveActivities` command failed, so `error` is `true`. Then we call to `clearResult()` to remove the failed status, and show a `SnackBar`, with the `SnackBarAction` that runs `saveActivities` again when tapped. ```dart if (widget.viewModel.saveActivities.error) { widget.viewModel.saveActivities.clearResult(); ScaffoldMessenger.of(context).showSnackBar( SnackBar( content: const Text('Error while saving activities'), action: SnackBarAction( label: "Try again", onPressed: widget.viewModel.saveActivities.execute, ), ), ); } ``` Since commands expose `running`, `error` and `completed`, it is easy to implement loading and error indicator widgets: [Screencast from 2024-07-29 16-55-42.webm](https://github.com/user-attachments/assets/fb5772d0-7b9d-4ded-8fa2-9ce347f4d555) As side node, we can easily simulate that state by adding these lines in any of the repository implementations: ```dart await Future.delayed(Durations.extralong1); return Result.error(Exception('ERROR!')); ``` _In-code error handling:_ The project introduces the `logging` package. In the entry point `main_development.dart` the log level is configured. Then in code, a `Logger` is creaded in each View Model with the name of the class. Then the log calls are used depending on the `Result` response, some finer traces are also added. By default, they are printed to the IDE debug console, for example: ``` [SearchFormViewModel] Continents (7) loaded [SearchFormViewModel] ItineraryConfig loaded [SearchFormViewModel] Selected continent: Asia [SearchFormViewModel] Selected date range: 2024-07-30 00:00:00.000 - 2024-08-08 00:00:00.000 [SearchFormViewModel] Set guests number: 1 [SearchFormViewModel] ItineraryConfig saved ``` **Other changes** - The json files containing destinations and activities are moved into the `app/assets/` folders, and the server is querying those files instead of their own copy. This is done to avoid file duplication but we can make a copy of those assets files for the server if we decide to. **TODO Next** - I will implement the "book a trip" screen which would complete the main application flow, which should introduce a more complex "component/use case" outside a view model. ## Pre-launch Checklist - [x] I read the [Flutter Style Guide] _recently_, and have followed its advice. - [x] I signed the [CLA]. - [x] I read the [Contributors Guide]. - [x] I updated/added relevant documentation (doc comments with `///`). - [x] All existing and new tests are passing. If you need help, consider asking for advice on the #hackers-devrel channel on [Discord]. <!-- Links --> [Flutter Style Guide]: https://github.com/flutter/flutter/blob/master/docs/contributing/Style-guide-for-Flutter-repo.md [CLA]: https://cla.developers.google.com/ [Discord]: https://github.com/flutter/flutter/blob/master/docs/contributing/Chat.md [Contributors Guide]: https://github.com/flutter/samples/blob/main/CONTRIBUTING.md		4 months ago
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command_test.dart	Compass App: Activities screen, error handling and logs (#2371)	4 months ago