class ActiveRecord::XmlSerializer::Attribute

def compute_type
  klass = @serializable.class
  type = if klass.serialized_attributes.key?(name)
           super
         elsif klass.columns_hash.key?(name)
           klass.columns_hash[name].type
         else
           NilClass
         end
  { :text => :string,
    :time => :datetime }[type] || type
end