Extend dangerous attribute methods with dangerous methods from Object

activerecord/lib/active_record/attribute_methods.rb

@@ -33,7 +33,8 @@ def dangerous_attribute_methods # :nodoc:
           Base.instance_methods +
           Base.private_instance_methods -
           Base.superclass.instance_methods -
-          Base.superclass.private_instance_methods
+          Base.superclass.private_instance_methods +
+          %i[__id__ dup freeze hash object_id class clone]
         ).map { |m| -m.to_s }.to_set.freeze
       end
     end

activerecord/test/cases/attribute_methods_test.rb

@@ -651,8 +651,8 @@ def topic.approved; false; end
     assert_predicate topic, :is_test?
   end
 
-  test "raises ActiveRecord::DangerousAttributeError when defining an AR method in a model" do
-    %w(save create_or_update).each do |method|
+  test "raises ActiveRecord::DangerousAttributeError when defining an AR method or dangerous Object method in a model" do
+    %w(save create_or_update hash dup).each do |method|
       klass = Class.new(ActiveRecord::Base)
       klass.class_eval "def #{method}() 'defined #{method}' end"
       assert_raise ActiveRecord::DangerousAttributeError do