Use call_args in the define_proxy_method namespace.

activemodel/lib/active_model/attribute_methods.rb

@@ -409,10 +409,11 @@ def define_proxy_call(code_generator, name, proxy_target, parameters, *call_args
             mangled_name = "__temp__#{name.unpack1("h*")}"
           end
 
-          code_generator.define_cached_method(name, as: mangled_name, namespace: :"#{namespace}_#{proxy_target}") do |batch|
-            call_args.map!(&:inspect)
-            call_args << parameters if parameters
+          call_args.map!(&:inspect)
+          call_args << parameters if parameters
+          namespace = :"#{namespace}_#{proxy_target}_#{call_args.join("_")}}"
 
+          code_generator.define_cached_method(name, as: mangled_name, namespace: namespace) do |batch|
             body = if CALL_COMPILABLE_REGEXP.match?(proxy_target)
               "self.#{proxy_target}(#{call_args.join(", ")})"
             else

activerecord/test/cases/attribute_methods_test.rb

@@ -1144,6 +1144,23 @@ def some_method_that_is_not_on_super
     assert_equal "abcd", model.read_attribute_before_type_cast("new_bank_balance")
   end
 
+  ToBeLoadedFirst = Class.new(ActiveRecord::Base) do
+    self.table_name = "topics"
+    alias_attribute :subject, :author_name
+  end
+
+  ToBeLoadedSecond = Class.new(ActiveRecord::Base) do
+    self.table_name = "topics"
+    alias_attribute :subject, :title
+  end
+
+  test "aliases to the same attribute name do not conflict with each other" do
+    first_model_object = ToBeLoadedFirst.new(author_name: "author 1")
+    assert_equal("author 1", first_model_object.subject)
+    second_model_object = ToBeLoadedSecond.new(title: "foo")
+    assert_equal("foo", second_model_object.subject)
+  end
+
   ClassWithDeprecatedAliasAttributeBehavior = Class.new(ActiveRecord::Base) do
     self.table_name = "topics"
     alias_attribute :subject, :title