gistfile1.rb

if defined?(ActiveRecord)
  class ActiveRecord::Base
    def read_attribute_with_enforcing_utf8(attr_name)
      v = read_attribute_without_enforcing_utf8(attr_name)
      if String === v && column_for_attribute(attr_name).text?
        return v.force_encoding(Encoding::UTF_8) if v.encoding == Encoding::ASCII_8BIT
      end
      return v
    end
    alias_method_chain :read_attribute, :enforcing_utf8

    class << self
      private
      def define_read_method_with_enforcing_utf8(symbol, attr_name, column)
        define_read_method_without_enforcing_utf8(symbol, attr_name, column)
        if column.text?
          self.class_eval <<-END_DEFINITION, __FILE__, __LINE__
            def #{symbol}_with_enforcing_utf8
              v = #{symbol}_without_enforcing_utf8
              v = v.force_encoding(Encoding::UTF_8) if v && v.encoding == Encoding::ASCII_8BIT
              return v
            end
            alias_method_chain :#{symbol}, :enforcing_utf8
          END_DEFINITION
        end
      end
      alias_method_chain :define_read_method, :enforcing_utf8
    end
  end
end