module Fog class Model def self.attribute(name, other_names = []) class_eval <<-EOS, __FILE__, __LINE__ attr_accessor :#{name} EOS @attributes ||= [] @attributes |= [name] for other_name in [*other_names] aliases[other_name] = name end end def self.identity(name, other_names = []) @identity = name self.attribute(name, other_names) end def self.aliases @aliases ||= {} end def self.attributes @attributes ||= [] end def attributes attributes = {} for attribute in self.class.attributes attributes[attribute] = send("#{attribute}") end attributes end def collection @collection end def identity send(self.class.instance_variable_get('@identity')) end def initialize(new_attributes = {}) merge_attributes(new_attributes) end def inspect data = "#<#{self.class.name}" for attribute in self.class.attributes data << " #{attribute}=#{send(attribute).inspect}" end data << ">" end def merge_attributes(new_attributes = {}) for key, value in new_attributes if aliased_key = self.class.aliases[key] send("#{aliased_key}=", value) else send("#{key}=", value) end end self end def new_record? !identity end def reload new_attributes = collection.get(identity).attributes merge_attributes(new_attributes) end private def collection=(new_collection) @collection = new_collection end def connection=(new_connection) @connection = new_connection end def connection @connection end def remap_attributes(attributes, mapping) for key, value in mapping if attributes.key?(key) attributes[value] = attributes.delete(key) end end end end end