Remove support to Marshal load Rails 5.x `ActiveModel::AttributeSet` format

activemodel/CHANGELOG.md

@@ -1,3 +1,7 @@
+*   Remove support to Marshal load Rails 5.x `ActiveModel::AttributeSet` format.
+
+    *Rafael Mendonça França*
+
 *   Remove support to Marshal and YAML load Rails 5.x error format.
 
     *Rafael Mendonça França*

activemodel/lib/active_model/attribute_set/builder.rb

@@ -144,16 +144,7 @@ module ActiveModel
     end
 
     def marshal_load(values)
-      if values.is_a?(Hash)
-        ActiveSupport::Deprecation.warn(<<~MSG)
-          Marshalling load from legacy attributes format is deprecated and will be removed in Rails 7.0.
-        MSG
-        empty_hash = {}.freeze
-        initialize(empty_hash, empty_hash, empty_hash, empty_hash, values)
-        @materialized = true
-      else
-        initialize(*values)
-      end
+      initialize(*values)
     end
 
     protected

activemodel/test/cases/attribute_set_test.rb

@@ -232,7 +232,7 @@ module ActiveModel
       assert_equal({ foo: "1" }, attributes.to_hash)
     end
 
-    test "marshalling dump/load legacy materialized attribute hash" do
+    test "marshalling dump/load materialized attribute hash" do
       builder = AttributeSet::Builder.new(foo: Type::String.new)
 
       def builder.build_from_database(values = {}, additional_types = {})
@@ -242,16 +242,8 @@ module ActiveModel
 
       attributes = builder.build_from_database(foo: "1")
 
-      attributes.instance_variable_get(:@attributes).instance_eval do
-        class << self
-          def marshal_dump
-            materialize # legacy marshal format before Rails 5.1
-          end
-        end
-      end
-
       data = Marshal.dump(attributes)
-      attributes = assert_deprecated { Marshal.load(data) }
+      attributes = Marshal.load(data)
       assert_equal({ foo: "1" }, attributes.to_hash)
     end
 

guides/source/7_0_release_notes.md

@@ -144,6 +144,8 @@ Please refer to the [Changelog][active-model] for detailed changes.
 
 *   Remove support to Marshal and YAML load Rails 5.x error format.
 
+*   Remove support to Marshal load Rails 5.x `ActiveModel::AttributeSet` format.
+
 ### Deprecations
 
 ### Notable changes