Remove `.superclass_delegating_accessor`. Refer #14271

4 files changed, 4 insertions, 168 deletions

diff --git a/activesupport/CHANGELOG.md b/activesupport/CHANGELOG.md
index d6fa651e39..e757180f50 100644
--- a/activesupport/CHANGELOG.md
+++ b/activesupport/CHANGELOG.md
@@ -1,3 +1,7 @@
+*   Remove `Class#superclass_delegating_accessor`, use `Class#class_attribute` instead.
+
+    *Akshay Vishnoi*
+
 *   Patch `Delegator` to work with `#try`.
 
     Fixes #5790.
diff --git a/activesupport/lib/active_support/core_ext/class.rb b/activesupport/lib/active_support/core_ext/class.rb
index c750a10bb2..ef903d59b5 100644
--- a/activesupport/lib/active_support/core_ext/class.rb
+++ b/activesupport/lib/active_support/core_ext/class.rb
@@ -1,3 +1,2 @@
 require 'active_support/core_ext/class/attribute'
-require 'active_support/core_ext/class/delegating_attributes'
 require 'active_support/core_ext/class/subclasses'
diff --git a/activesupport/lib/active_support/core_ext/class/delegating_attributes.rb b/activesupport/lib/active_support/core_ext/class/delegating_attributes.rb
deleted file mode 100644
index 1c305c5970..0000000000
--- a/activesupport/lib/active_support/core_ext/class/delegating_attributes.rb
+++ /dev/null
@@ -1,45 +0,0 @@
-require 'active_support/core_ext/kernel/singleton_class'
-require 'active_support/core_ext/module/remove_method'
-require 'active_support/core_ext/module/deprecation'
-
-
-class Class
-  def superclass_delegating_accessor(name, options = {})
-    # Create private _name and _name= methods that can still be used if the public
-    # methods are overridden.
-    _superclass_delegating_accessor("_#{name}", options)
-
-    # Generate the public methods name, name=, and name?.
-    # These methods dispatch to the private _name, and _name= methods, making them
-    # overridable.
-    singleton_class.send(:define_method, name) { send("_#{name}") }
-    singleton_class.send(:define_method, "#{name}?") { !!send("_#{name}") }
-    singleton_class.send(:define_method, "#{name}=") { |value| send("_#{name}=", value) }
-
-    # If an instance_reader is needed, generate public instance methods name and name?.
-    if options[:instance_reader] != false
-      define_method(name) { send("_#{name}") }
-      define_method("#{name}?") { !!send("#{name}") }
-    end
-  end
-
-  deprecate superclass_delegating_accessor: :class_attribute
-
-  private
-    # Take the object being set and store it in a method. This gives us automatic
-    # inheritance behavior, without having to store the object in an instance
-    # variable and look up the superclass chain manually.
-    def _stash_object_in_method(object, method, instance_reader = true)
-      singleton_class.remove_possible_method(method)
-      singleton_class.send(:define_method, method) { object }
-      remove_possible_method(method)
-      define_method(method) { object } if instance_reader
-    end
-
-    def _superclass_delegating_accessor(name, options = {})
-      singleton_class.send(:define_method, "#{name}=") do |value|
-        _stash_object_in_method(value, name, options[:instance_reader] != false)
-      end
-      send("#{name}=", nil)
-    end
-end
diff --git a/activesupport/test/core_ext/class/delegating_attributes_test.rb b/activesupport/test/core_ext/class/delegating_attributes_test.rb
deleted file mode 100644
index 447b1d10ad..0000000000
--- a/activesupport/test/core_ext/class/delegating_attributes_test.rb
+++ /dev/null
@@ -1,122 +0,0 @@
-require 'abstract_unit'
-require 'active_support/core_ext/class/delegating_attributes'
-
-module DelegatingFixtures
-  class Parent
-  end
-
-  class Child < Parent
-    ActiveSupport::Deprecation.silence do
-      superclass_delegating_accessor :some_attribute
-    end
-  end
-
-  class Mokopuna < Child
-  end
-
-  class PercysMom
-    ActiveSupport::Deprecation.silence do
-      superclass_delegating_accessor :superpower
-    end
-  end
-
-  class Percy < PercysMom
-  end
-end
-
-class DelegatingAttributesTest < ActiveSupport::TestCase
-  include DelegatingFixtures
-  attr_reader :single_class
-
-  def setup
-    @single_class = Class.new(Object)
-  end
-
-  def test_simple_accessor_declaration
-    assert_deprecated do
-      single_class.superclass_delegating_accessor :both
-    end
-
-    # Class should have accessor and mutator
-    # the instance should have an accessor only
-    assert_respond_to single_class, :both
-    assert_respond_to single_class, :both=
-    assert single_class.public_instance_methods.map(&:to_s).include?("both")
-    assert !single_class.public_instance_methods.map(&:to_s).include?("both=")
-  end
-
-  def test_simple_accessor_declaration_with_instance_reader_false
-    _instance_methods = single_class.public_instance_methods
-
-    assert_deprecated do
-      single_class.superclass_delegating_accessor :no_instance_reader, :instance_reader => false
-    end
-
-    assert_respond_to single_class, :no_instance_reader
-    assert_respond_to single_class, :no_instance_reader=
-    assert !_instance_methods.include?(:no_instance_reader)
-    assert !_instance_methods.include?(:no_instance_reader?)
-    assert !_instance_methods.include?(:_no_instance_reader)
-  end
-
-  def test_working_with_simple_attributes
-    assert_deprecated do
-      single_class.superclass_delegating_accessor :both
-    end
-
-    single_class.both = "HMMM"
-
-    assert_equal "HMMM", single_class.both
-    assert_equal true, single_class.both?
-
-    assert_equal "HMMM", single_class.new.both
-    assert_equal true, single_class.new.both?
-
-    single_class.both = false
-    assert_equal false, single_class.both?
-  end
-
-  def test_child_class_delegates_to_parent_but_can_be_overridden
-    parent = Class.new
-
-    assert_deprecated do
-      parent.superclass_delegating_accessor :both
-    end
-
-    child = Class.new(parent)
-    parent.both = "1"
-    assert_equal "1", child.both
-
-    child.both = "2"
-    assert_equal "1", parent.both
-    assert_equal "2", child.both
-
-    parent.both = "3"
-    assert_equal "3", parent.both
-    assert_equal "2", child.both
-  end
-
-  def test_delegation_stops_at_the_right_level
-    assert_nil Percy.superpower
-    assert_nil PercysMom.superpower
-
-    PercysMom.superpower = :heatvision
-    assert_equal :heatvision, Percy.superpower
-  end
-
-  def test_delegation_stops_for_nil
-    Mokopuna.some_attribute = nil
-    Child.some_attribute="1"
-
-    assert_equal "1", Child.some_attribute
-    assert_nil Mokopuna.some_attribute
-  ensure
-    Child.some_attribute=nil
-  end
-
-  def test_deprecation_warning
-    assert_deprecated(/superclass_delegating_accessor is deprecated/) do
-      single_class.superclass_delegating_accessor :test_attribute
-    end
-  end
-end