Updated rails autoloading to new zeitwerk

See https://edgeguides.rubyonrails.org/upgrading_ruby_on_rails.html#autoloading
for more details.

Author: tmuntaner

bin/rmt-data-import

@@ -21,7 +21,6 @@ require 'json'
 require_relative '../config/initializers_cli/disable_deprecation_warnings'
 require_relative '../config/initializers_cli/rmt_fast_gettext'
 require_relative '../config/initializers_cli/rmt_fast_gettext_cli_locale'
-require 'rmt/cli/smt_importer'
 
 no_systems = false
 data_dir = nil
@@ -35,8 +34,8 @@ ActiveRecord::Base.establish_connection(db_config)
 
 begin
   Time.zone ||= 'UTC'
-  script = SMTImporter.new(data_dir, no_systems)
+  script = RMT::CLI::SMTImporter.new(data_dir, no_systems)
   script.run ARGV
-rescue SMTImporter::ImportException
+rescue RMT::CLI::SMTImporter::ImportException
   exit 1
 end

config/application.rb

@@ -54,10 +54,9 @@ class Application < Rails::Application
 
     # Initialize configuration defaults for originally generated Rails version.
     config.load_defaults 6.0
-    config.autoloader = :classic
 
-    config.autoload_paths << Rails.root.join('lib')
-    config.autoload_paths << Rails.root.join('app', 'validators')
+    config.eager_load_paths << Rails.root.join('lib')
+    config.eager_load_paths << Rails.root.join('app', 'validators')
 
     # Settings in config/environments/* take precedence over those specified here.
     # Application configuration can go into files in config/initializers

config/initializers/zeitwerk.rb

@@ -0,0 +1,11 @@
+Rails.autoloaders.each do |autoloader|
+  autoloader.inflector = Zeitwerk::Inflector.new
+  autoloader.inflector.inflect(
+    'rmt' => 'RMT',
+    'cli' => 'CLI',
+    'suse' => 'SUSE',
+    'scc' => 'SCC',
+    'gpg' => 'GPG',
+    'smt_importer' => 'SMTImporter'
+  )
+end

lib/rmt/cli/smt_importer.rb

@@ -1,7 +1,7 @@
 require 'csv'
 require 'ostruct'
 
-class SMTImporter
+class RMT::CLI::SMTImporter
   attr_accessor :data_dir
   attr_accessor :no_systems
 

spec/lib/rmt/cli/smt_importer_spec.rb

@@ -1,7 +1,7 @@
 require 'rails_helper'
 require 'rmt/cli/smt_importer'
 
-describe SMTImporter do
+describe RMT::CLI::SMTImporter do
   let(:data_dir) { File.join(Dir.pwd, 'spec/fixtures/files/csv') }
   let(:no_systems) { false }
   let(:importer) { described_class.new(data_dir, no_systems) }
@@ -281,7 +281,7 @@
 
     it 'shows the help output when invalid arguments supplied' do
       expect do
-        expect { importer.parse_cli_arguments ['--nope-nope'] }.to raise_exception SMTImporter::ImportException
+        expect { importer.parse_cli_arguments ['--nope-nope'] }.to raise_exception RMT::CLI::SMTImporter::ImportException
       end.to output(<<-OUTPUT.strip_heredoc).to_stdout
         Usage: rspec [options]
             -d, --data PATH                  Path to unpacked SMT data tarball
@@ -294,7 +294,7 @@
   describe '#check_products_exist' do
     it 'warns and exits if no product exists' do
       expect do
-        expect { importer.check_products_exist }.to raise_exception SMTImporter::ImportException
+        expect { importer.check_products_exist }.to raise_exception RMT::CLI::SMTImporter::ImportException
       end.to output(<<-OUTPUT.strip_heredoc).to_stderr
         RMT has not been synced to SCC yet. Please run 'rmt-cli sync' before
         importing data from SMT.