02_freezed_classes.md

Freezed Classes

To demonstrate converting of API responses in JSON to freezed model classes, we're going to use jsonplaceholder user API as an example.

To define the user type in the API as freezed model classes in Dart,

• Create model dart files into the packages/model folder. Please refer them in the folder including how to export with the barrel files.

• Add following melos scripts to generate the model classes with build_runner:

  generate:
    run: melos run generate:dart && melos run generate:flutter
    description: Build all generated files for Dart & Flutter packages in this project.

  generate:dart:
    run: melos exec -c 1 --depends-on="build_runner" --no-flutter -- "dart run build_runner build --delete-conflicting-outputs"
    description: Build all generated files for Dart packages in this project.

  generate:flutter:
    run: melos exec -c 1 --depends-on="build_runner" --flutter -- "flutter pub run build_runner build --delete-conflicting-outputs"
    description: Build all generated files for Flutter packages in this project.

Run the script to generate freezed model classes with melos:

melos run generate:dart

Run the test from vscode and with melos:

• Test with VSCode:

• Add following melos scripts to test the model classes with melos.

  test:
    run: melos run test:dart --no-select && melos run test:flutter --no-select && melos run test:genhtml_lcov
    description: Run all Dart & Flutter tests in this project.

  test:dart:
    run: melos exec  -c 1 --fail-fast -- "\$MELOS_ROOT_PATH/scripts/coverage.sh"
    description: Run Dart tests for a specific package in this project.
    select-package:
      flutter: false
      dir-exists: test

  test:flutter:
    run: melos exec --dir-exists="test" -c 1 --fail-fast -- "flutter test --coverage --exclude-tags=golden"
    description: Run Flutter tests for a specific package in this project.
    select-package:
      flutter: true
      dir-exists: test

  test:genhtml_lcov:
    run: melos exec --file-exists="coverage/lcov.info" -c 1 --fail-fast -- "genhtml coverage/lcov.info -o coverage"
    description: Generate line coverage report from lcov.info.

  test:golden:
    run: melos exec --dir-exists="test" -c 1 --fail-fast -- "flutter test --update-goldens --tags=golden"
    description: Run Flutter golden tests for a specific package in this project.
    select-package:
      flutter: true
      dir-exists: test

melos run test