class AWS::DynamoDB::AttributeCollection::UpdateBuilder

def attribute_updates(action, attributes, our_opts = {})
  new_updates = attributes.inject({}) do |new_updates, (name, value)|
    name = name.to_s
    context = "in value for attribute #{name}"
    value = [value].flatten if our_opts[:setify]
    new_updates.update(name => {
                         :action => action,
                         :value =>
                         format_attribute_value(value, context)
                       })
  end
  add_updates(new_updates)
end