feat: migrate from ActiveSupport::Autoload to Zeitwerk (#457)

Author: seuros

closure_tree.gemspec

@@ -27,6 +27,7 @@ Gem::Specification.new do |gem|
 
   gem.add_dependency 'activerecord', '>= 7.2.0'
   gem.add_dependency 'with_advisory_lock', '>= 7.0.0'
+  gem.add_dependency 'zeitwerk', '~> 2.7'
 
   gem.add_development_dependency 'database_cleaner'
   gem.add_development_dependency 'minitest'

lib/closure_tree.rb

@@ -1,50 +1,22 @@
 # frozen_string_literal: true
 
 require 'active_record'
+require 'zeitwerk'
 
-module ClosureTree
-  extend ActiveSupport::Autoload
-
-  autoload :HasClosureTree
-  autoload :HasClosureTreeRoot
-  autoload :Support
-  autoload :HierarchyMaintenance
-  autoload :Model
-  autoload :Finders
-  autoload :HashTree
-  autoload :Digraphs
-  autoload :DeterministicOrdering
-  autoload :NumericDeterministicOrdering
-  autoload :Configuration
-  autoload :AdapterSupport
+loader = Zeitwerk::Loader.for_gem
+loader.ignore("#{__dir__}/generators")
+loader.setup
 
+module ClosureTree
   def self.configure
-    yield configuration
+    ActiveSupport::Deprecation.new.warn(
+      'ClosureTree.configure is deprecated and will be removed in a future version. ' \
+      'Configuration is no longer needed.'
+    )
+    yield if block_given?
   end
-
-  def self.configuration
-    @configuration ||= Configuration.new
-  end
-end
-
-ActiveSupport.on_load :active_record do
-  ActiveRecord::Base.extend ClosureTree::HasClosureTree
-  ActiveRecord::Base.extend ClosureTree::HasClosureTreeRoot
-end
-
-# Adapter injection for different database types
-ActiveSupport.on_load :active_record_postgresqladapter do
-  prepend ClosureTree::AdapterSupport
-end
-
-ActiveSupport.on_load :active_record_mysql2adapter do
-  prepend ClosureTree::AdapterSupport
-end
-
-ActiveSupport.on_load :active_record_trilogyadapter do
-  prepend ClosureTree::AdapterSupport
 end
 
-ActiveSupport.on_load :active_record_sqlite3adapter do
-  prepend ClosureTree::AdapterSupport
+ActiveSupport.on_load(:active_record) do
+  extend ClosureTree::HasClosureTree, ClosureTree::HasClosureTreeRoot
 end

lib/closure_tree/adapter_support.rb

@@ -36,8 +36,6 @@ def has_closure_tree(options = {})
       include ClosureTree::NumericDeterministicOrdering if _ct.order_is_numeric?
 
       connection_pool.release_connection
-    rescue StandardError => e
-      raise e unless ClosureTree.configuration.database_less
     end
 
     alias acts_as_tree has_closure_tree

lib/closure_tree/configuration.rb

@@ -1,12 +1,5 @@
 # frozen_string_literal: true
 
-require 'closure_tree/support_flags'
-require 'closure_tree/support_attributes'
-require 'closure_tree/numeric_order_support'
-require 'closure_tree/active_record_support'
-require 'closure_tree/hash_tree_support'
-require 'closure_tree/arel_helpers'
-
 # This class and mixins are an effort to reduce the namespace pollution to models that act_as_tree.
 module ClosureTree
   class Support