Require Active Support as is intended

> In order to have the smallest default footprint possible, Active Support loads the minimum dependencies by default. It is broken in small pieces so that only the desired extensions can be loaded.

https://guides.rubyonrails.org/active_support_core_extensions.html#stand-alone-active-support

This was changed in Rails 3, released 2010-08-29.

- We're not using anything from `core_ext/module/introspection`
- We're not using blank or present from `core_ext/object/blank`
- We're not using `autoload`

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+### Changed
+
+- Explicitly require less of `active_support` (#837)
+
 ## 2.4.0 (2024-08-26)
 
 ## Changed

lib/pundit.rb

@@ -1,12 +1,9 @@
 # frozen_string_literal: true
 
+require "active_support"
+
 require "pundit/version"
 require "pundit/policy_finder"
-require "active_support/concern"
-require "active_support/core_ext/string/inflections"
-require "active_support/core_ext/object/blank"
-require "active_support/core_ext/module/introspection"
-require "active_support/dependencies/autoload"
 require "pundit/authorization"
 require "pundit/context"
 require "pundit/cache_store/null_store"

lib/pundit/policy_finder.rb

@@ -1,5 +1,8 @@
 # frozen_string_literal: true
 
+# String#safe_constantize, String#demodulize, String#underscore, String#camelize
+require "active_support/core_ext/string/inflections"
+
 module Pundit
   # Finds policy and scope classes for given object.
   # @api public

lib/pundit/rspec.rb

@@ -1,5 +1,8 @@
 # frozen_string_literal: true
 
+# Array#to_sentence
+require "active_support/core_ext/array/conversions"
+
 module Pundit
   module RSpec
     module Matchers

pundit.gemspec

@@ -22,11 +22,10 @@ Gem::Specification.new do |gem|
   gem.metadata      = { "rubygems_mfa_required" => "true" }
 
   gem.add_dependency "activesupport", ">= 3.0.0"
-  gem.add_development_dependency "actionpack", ">= 3.0.0"
-  gem.add_development_dependency "activemodel", ">= 3.0.0"
+  gem.add_development_dependency "actionpack", ">= 3.0.0" # Used to test strong parameters.
+  gem.add_development_dependency "activemodel", ">= 3.0.0" # Used to test ActiveModel::Naming.
   gem.add_development_dependency "bundler"
-  gem.add_development_dependency "pry"
-  gem.add_development_dependency "railties", ">= 3.0.0"
+  gem.add_development_dependency "railties", ">= 3.0.0" # Used to test generators.
   gem.add_development_dependency "rake"
   gem.add_development_dependency "rspec", ">= 3.0.0"
   gem.add_development_dependency "rubocop"

spec/authorization_spec.rb

@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 require "spec_helper"
+require "action_controller/metal/strong_parameters"
 
 describe Pundit::Authorization do
   def to_params(*args, **kwargs, &block)
@@ -157,7 +158,7 @@ def to_params(*args, **kwargs, &block)
     end
 
     it "allows policy to be injected" do
-      new_policy = OpenStruct.new
+      new_policy = double
       controller.policies[post] = new_policy
 
       expect(controller.policy(post)).to eq new_policy
@@ -182,7 +183,7 @@ def to_params(*args, **kwargs, &block)
     end
 
     it "allows policy_scope to be injected" do
-      new_scope = OpenStruct.new
+      new_scope = double
       controller.policy_scopes[Post] = new_scope
 
       expect(controller.policy_scope(Post)).to eq new_scope

spec/spec_helper.rb

@@ -20,14 +20,7 @@
 
 require "pundit"
 require "pundit/rspec"
-
-require "rack"
-require "rack/test"
-require "pry"
-require "active_support"
-require "active_support/core_ext"
 require "active_model/naming"
-require "action_controller/metal/strong_parameters"
 
 # Load all supporting files: models, policies, etc.
 require "zeitwerk"

spec/support/models/customer/post.rb

@@ -2,9 +2,7 @@
 
 module Customer
   class Post < ::Post
-    def model_name
-      OpenStruct.new(param_key: "customer_post")
-    end
+    extend ActiveModel::Naming
 
     def self.policy_class
       PostPolicy