let Zeitwerk autoload the `lib/` directory

this also allows the UseCase classes to be hot reloaded in dev 🎉

- remove use_case requires (except for the exporter as Zeitwerk
  doesn't know about the subclasses)
- move version.rb to lib/retrospring so that Zeitwerk knows where
  to find Retrospring::Version

app/controllers/ajax/moderation_controller.rb

@@ -1,5 +1,5 @@
-require 'use_case/user/ban'
-require 'use_case/user/unban'
+# frozen_string_literal: true
+
 require 'errors'
 
 class Ajax::ModerationController < AjaxController

app/controllers/ajax/question_controller.rb

@@ -1,9 +1,6 @@
 # frozen_string_literal: true
 
 require "errors"
-require "use_case/question/create"
-require "use_case/question/create_followers"
-require "use_case/question/destroy"
 
 class Ajax::QuestionController < AjaxController
   def destroy

app/controllers/ajax/relationship_controller.rb

@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require "use_case/relationship/create"
-require "use_case/relationship/destroy"
 require "errors"
 
 class Ajax::RelationshipController < AjaxController

config/application.rb

@@ -8,8 +8,6 @@ start = Time.now
 Bundler.require(*Rails.groups)
 puts 'processing time of bundler require: ' + "#{(Time.now - start).round(3).to_s.ljust(5, '0')}s".light_green
 
-require_relative "../lib/version"
-
 module Justask
   class Application < Rails::Application
     # Settings in config/environments/* take precedence over those specified here.
@@ -17,7 +15,11 @@ module Justask
     # -- all .rb files in that directory are automatically loaded.
 
     config.load_defaults 6.0
-    config.autoload_paths += %W["#{config.root}/app/validators"]
+    # add `lib/` to the autoload paths so zeitwerk can find e.g. our `UseCase`s
+    # without an explicit `require`, and also take care of hot reloading the code
+    # (really useful in development!)
+    config.autoload_paths << config.root.join("lib")
+    config.eager_load_paths << config.root.join("lib")
 
     # Use Sidekiq for background jobs
     config.active_job.queue_adapter = :sidekiq

lib/tasks/version.rake

@@ -9,7 +9,7 @@ namespace :version do
     now = Time.now.utc
     today_ymd = %i[year month day].map { now.public_send(_1) }
 
-    version_path = Rails.root.join("lib/version.rb")
+    version_path = Rails.root.join("lib/retrospring/version.rb")
     version_contents = File.read(version_path)
 
     patch_contents = lambda do |key, val|
@@ -35,7 +35,7 @@ namespace :version do
 
   desc "Commit and tag a new release"
   task commit: :environment do
-    version_path = Rails.root.join("lib/version.rb")
+    version_path = Rails.root.join("lib/retrospring/version.rb")
 
     puts "Committing version"
     sh %(git commit -m 'Bump version to #{Retrospring::Version}' -- #{version_path.to_s.inspect})

lib/use_case/data_export/answers.rb

@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require "use_case/data_export/base"
-
 module UseCase
   module DataExport
     class Answers < UseCase::DataExport::Base

lib/use_case/data_export/appendables.rb

@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require "use_case/data_export/base"
-
 module UseCase
   module DataExport
     class Appendables < UseCase::DataExport::Base

lib/use_case/data_export/base.rb

@@ -2,8 +2,6 @@
 
 require "json"
 
-require "use_case/base"
-
 module UseCase
   module DataExport
     class Base < UseCase::Base

lib/use_case/data_export/comments.rb

@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require "use_case/data_export/base"
-
 module UseCase
   module DataExport
     class Comments < UseCase::DataExport::Base

lib/use_case/data_export/mute_rules.rb

@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require "use_case/data_export/base"
-
 module UseCase
   module DataExport
     class MuteRules < UseCase::DataExport::Base

lib/use_case/data_export/questions.rb

@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require "use_case/data_export/base"
-
 module UseCase
   module DataExport
     class Questions < UseCase::DataExport::Base

lib/use_case/data_export/relationships.rb

@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require "use_case/data_export/base"
-
 module UseCase
   module DataExport
     class Relationships < UseCase::DataExport::Base

lib/use_case/data_export/theme.rb

@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require "use_case/data_export/base"
-
 module UseCase
   module DataExport
     class Theme < UseCase::DataExport::Base

lib/use_case/data_export/user.rb

@@ -2,8 +2,6 @@
 
 require "httparty"
 
-require "use_case/data_export/base"
-
 module UseCase
   module DataExport
     class User < UseCase::DataExport::Base

lib/use_case/question/create.rb

@@ -1,6 +1,5 @@
 # frozen_string_literal: true
 
-require "use_case/base"
 require "errors"
 
 module UseCase

lib/use_case/question/create_followers.rb

@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require "use_case/base"
-
 module UseCase
   module Question
     class CreateFollowers < UseCase::Base

lib/use_case/question/destroy.rb

@@ -1,6 +1,5 @@
 # frozen_string_literal: true
 
-require "use_case/base"
 require "errors"
 
 module UseCase

lib/use_case/relationship/create.rb

@@ -1,6 +1,5 @@
 # frozen_string_literal: true
 
-require "use_case/base"
 require "errors"
 
 module UseCase

lib/use_case/relationship/destroy.rb

@@ -1,6 +1,5 @@
 # frozen_string_literal: true
 
-require "use_case/base"
 require "errors"
 
 module UseCase

lib/use_case/user/ban.rb

@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require "use_case/base"
-
 module UseCase
   module User
     class Ban < UseCase::Base

lib/use_case/user/unban.rb

@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require 'use_case/base'
-
 module UseCase
   module User
     class Unban < UseCase::Base

spec/lib/retrospring/version_spec.rb

@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require "version"
-
 RSpec.describe Retrospring::Version do
   before(:each) do
     allow(Retrospring::Version).to receive(:year) { 1984 }

spec/lib/use_case/data_export/answers_spec.rb

@@ -2,8 +2,6 @@
 
 require "rails_helper"
 
-require "use_case/data_export/answers"
-
 describe UseCase::DataExport::Answers, :data_export do
   include ActiveSupport::Testing::TimeHelpers
 

spec/lib/use_case/data_export/appendables_spec.rb

@@ -2,8 +2,6 @@
 
 require "rails_helper"
 
-require "use_case/data_export/appendables"
-
 describe UseCase::DataExport::Appendables, :data_export do
   include ActiveSupport::Testing::TimeHelpers
 

spec/lib/use_case/data_export/comments_spec.rb

@@ -2,8 +2,6 @@
 
 require "rails_helper"
 
-require "use_case/data_export/comments"
-
 describe UseCase::DataExport::Comments, :data_export do
   include ActiveSupport::Testing::TimeHelpers
 

spec/lib/use_case/data_export/mute_rules_spec.rb

@@ -2,8 +2,6 @@
 
 require "rails_helper"
 
-require "use_case/data_export/mute_rules"
-
 describe UseCase::DataExport::MuteRules, :data_export do
   include ActiveSupport::Testing::TimeHelpers
 

spec/lib/use_case/data_export/questions_spec.rb

@@ -2,8 +2,6 @@
 
 require "rails_helper"
 
-require "use_case/data_export/questions"
-
 describe UseCase::DataExport::Questions, :data_export do
   include ActiveSupport::Testing::TimeHelpers
 

spec/lib/use_case/data_export/relationships_spec.rb

@@ -2,8 +2,6 @@
 
 require "rails_helper"
 
-require "use_case/data_export/relationships"
-
 describe UseCase::DataExport::Relationships, :data_export do
   include ActiveSupport::Testing::TimeHelpers
 

spec/lib/use_case/data_export/theme_spec.rb

@@ -2,8 +2,6 @@
 
 require "rails_helper"
 
-require "use_case/data_export/theme"
-
 describe UseCase::DataExport::Theme, :data_export do
   include ActiveSupport::Testing::TimeHelpers
 

spec/lib/use_case/data_export/user_spec.rb

@@ -2,8 +2,6 @@
 
 require "rails_helper"
 
-require "use_case/data_export/user"
-
 describe UseCase::DataExport::User, :data_export do
   let(:user_params) do
     {

spec/lib/use_case/question/create_followers_spec.rb

@@ -2,7 +2,6 @@
 
 require "rails_helper"
 require "errors"
-require "use_case/question/create_followers"
 
 describe UseCase::Question::CreateFollowers do
   subject do

spec/lib/use_case/question/create_spec.rb

@@ -2,7 +2,6 @@
 
 require "rails_helper"
 require "errors"
-require "use_case/question/create"
 
 describe UseCase::Question::Create do
   subject do

spec/lib/use_case/question/destroy_spec.rb

@@ -2,7 +2,6 @@
 
 require "rails_helper"
 require "errors"
-require "use_case/question/destroy"
 
 describe UseCase::Question::Destroy do
   subject do

spec/lib/use_case/relationship/create_spec.rb

@@ -2,7 +2,6 @@
 
 require "rails_helper"
 
-require "use_case/relationship/create"
 require "errors"
 
 describe UseCase::Relationship::Create do

spec/lib/use_case/relationship/destroy_spec.rb

@@ -2,7 +2,6 @@
 
 require "rails_helper"
 
-require "use_case/relationship/destroy"
 require "errors"
 
 describe UseCase::Relationship::Destroy do

spec/support/example_exporter.rb

@@ -2,8 +2,6 @@
 
 raise ArgumentError.new("This file should only be required in the 'test' environment!  Current environment: #{Rails.env}") unless Rails.env.test?
 
-require "use_case/data_export/base"
-
 # an example exporter to be used for the tests of `Exporter`
 #
 # this only returning basic files, nothing user-specific.  each exporter should be tested individually.