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Versions: 12
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Stored size: 1.52 KB
Contents
module Hobo
module ModelSupport
# This module provides methods common to both Hobo::Model and Hobo::CompositeModel
def self.included(base)
base.extend(ClassMethods) if base.is_a? Class
end
module ClassMethods
def delegate_and_compose(*methods)
options = methods.pop
unless options.is_a?(Hash) && to = options[:to]
raise ArgumentError, ("Delegation needs a target. Supply an options hash " +
"with a :to key as the last argument (e.g. delegate :hello, :to => :greeter).")
end
use = options[:use]
methods.each do |method|
module_eval(<<-EOS, "(__COMPOSED_DELEGATION__)", 1)
def #{method}
@__#{method}_result__ ||= begin
obj = #{to}.__send__(#{method.inspect})
return nil if obj.nil?
if obj.nil?
nil
elsif obj.is_a?(Array)
obj.map {|o| self.compose_with(o, #{use.inspect})}
else
self.compose_with(obj, #{use.inspect})
end
end
end
EOS
end
end
end
end
end
Version data entries
12 entries across 12 versions & 1 rubygems