Fix SchemaMigration parent class mismatch for Rails 7.1

Author: westonganger

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 ## Unreleased
 
-* Nothing yet
+* [#31](https://github.com/westonganger/protected_attributes_continued/pull/31) - Fix SchemaMigration parent class mistmatch for Rails 7.1+
 * [View Full Diff](https://github.com/westonganger/protected_attributes_continued/compare/v1.8.2...master)
 
 ## v1.8.2 - 2021-07-13

lib/active_record/mass_assignment_security.rb

@@ -21,6 +21,8 @@ class ActiveRecord::Base
   include ActiveRecord::MassAssignmentSecurity::Inheritance
 end
 
-class ActiveRecord::SchemaMigration < ActiveRecord::Base
-  attr_accessible :version
+if ActiveRecord.version <= Gem::Version.new("7.0")
+  class ActiveRecord::SchemaMigration < ActiveRecord::Base
+    attr_accessible :version
+  end
 end

test/attribute_sanitization_test.rb

@@ -254,13 +254,7 @@ def test_create_with_bang_with_without_protection_with_attr_protected_attributes
   def test_protection_against_class_attribute_writers
     attribute_writers = [:logger, :configurations, :primary_key_prefix_type, :table_name_prefix, :table_name_suffix, :pluralize_table_names,
      :lock_optimistically, :default_scopes, :connection_handler, :nested_attributes_options,
-     :attribute_method_matchers, :time_zone_aware_attributes, :skip_time_zone_conversion_for_attributes]
-
-    if Rails::VERSION::MAJOR <= 6
-      attribute_writers += [:default_timezone, :schema_format, :timestamped_migrations]
-    end
-
-    attribute_writers.push(:_attr_readonly) if ActiveRecord::VERSION::MAJOR == 4 && ActiveRecord::VERSION::MINOR == 0
+     :time_zone_aware_attributes, :skip_time_zone_conversion_for_attributes]
 
     attribute_writers.each do |method|
       assert_respond_to Task, method