rails--rails/activerecord/CHANGELOG.md

• Fix undesirable RangeError by Type::Integer. Add Type::UnsignedInteger.

  Ryuta Kamizono

• Add foreign_type option to has_one and has_many association macros.

  This option enables to define the column name of associated object's type for polymorphic associations.

  Ulisses Almeida, Kassio Borges

• Remove deprecated behavior allowing nested arrays to be passed as query values.

  Melanie Gilman

• Deprecate passing a class as a value in a query. Users should pass strings instead.

  Melanie Gilman

• add_timestamps and remove_timestamps now properly reversible with options.

  Noam Gagliardi-Rabinovich

• ActiveRecord::ConnectionAdapters::ColumnDumper#column_spec and ActiveRecord::ConnectionAdapters::ColumnDumper#prepare_column_options no longer have a types argument. They should access connection#native_database_types directly.

  Yves Senn

Please check 4-2-stable for previous changes.