From fat controllers to use cases

Rails (API) app that shows different kinds of architecture (one per commit), and in the last one, how to use the Micro::Case gem to handle the application business logic.

Instructions to run this application

• Ruby version: 2.6.5
• System dependencies: sqlite3
• Configuration and database creation: bin/setup
• How to run the test suite: bin/rails test

The different kinds of architecture (project versions)

Version	Description	Rubycritic Score
1	Fat controller	91.53
2	Fat model, skinny controller	87.45
3	Concerns	89.25
4	Service objects	92.55
4.1	Service objects - Inheritance	92.93
4.2	Service objects - Inheritance overusing	93.15
5	Interactors	96.36
6	Domain objects	94.71
7	Use cases (Micro::Case)	94.97
7.1	Use cases - Dryer version	95.24
7.2	Use cases- Improving the SRP	95.11

Hint: in any of the versions above, use bin/rails rubycritic to see the full report result.

Extra: How to list all the use cases?

Use the use_cases task. e.g:

bin/rails use_cases

# Lines:
#     11 ./app/models/user/register/step/serialize_as_json.rb
#     12 ./app/models/user/register/step/validate_password.rb
#     17 ./app/models/user/register/step/create_record.rb
#     19 ./app/models/user/register/step/normalize_params.rb
#     10 ./app/models/user/register/flow.rb
#     18 ./app/models/todo/list/add_item.rb
#     16 ./app/models/todo/list/complete_item.rb
#     14 ./app/models/todo/list/delete_item.rb
#     12 ./app/models/todo/list/fetch_items.rb
#     14 ./app/models/todo/list/find_item.rb
#     19 ./app/models/todo/list/update_item.rb
#     16 ./app/models/todo/list/activate_item.rb
#     21 ./app/models/todo/serialize.rb
#    199 total
#
# Files: 13

Note: This task will only be available in the branches with use cases (v7, v7.1, v7.2).