Easier Bulk Attribute Setting/Updating for Datamapper

resource.rb

# Mass assign of attributes
#
# ==== Parameters
# value_hash <Hash[<Symbol>]>::
#
# --
# @api public
def attributes=(values_hash)
  values_hash.each do |name, value|
    name = name.to_s.sub(/\?\z/, '')

    if self.class.public_method_defined?(setter = "#{name}=")
      send(setter, value)
    else
      raise ArgumentError, "The property '#{name}' is not a public property."
    end
  end
end


# Updates attributes and saves model
#
# ==== Parameters
# attributes<Hash> Attributes to be updated
# keys<Symbol, String, Array> keys of Hash to update (others won't be updated)
#
# ==== Returns
# <TrueClass, FalseClass> if model got saved or not
#
#-
# @api public
def update_attributes(hash, *update_only)
  set_attributes(hash, *update_only)
  save
end


# Sets attributes on a model
#
# ==== Parameters
# attributes<Hash> Attributes to be updated
# keys<Symbol, String, Array> keys of Hash to update (others won't be set)
#
# ==== Returns
# <Hash> of key/values updated
#
#-
# @api public
def set_attributes(values_hash, *update_only)
  unless values_hash.is_a?(Hash)
    raise ArgumentError, "Expecting the first parameter of " +
      "set_attributes to be a hash; got #{values_hash.inspect}"
  end
  unless update_only.empty? 
    truncated_hash = {}
    update_only.each { |attr|  truncated_hash[attr] = values_hash[attr] }
    values_hash = truncated_hash
  end
  self.attributes = values_hash
  return values_hash
end