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Contents
require 'observer'
require 'singleton'
require 'set'
module MongoMapper
module Observing #:nodoc:
def self.included(model)
model.class_eval do
extend Observable
end
end
end
class Observer
include Singleton
class << self
def observe(*models)
models.flatten!
models.collect! { |model| model.is_a?(Symbol) ? model.to_s.camelize.constantize : model }
define_method(:observed_classes) { Set.new(models) }
end
def observed_class
if observed_class_name = name[/(.*)Observer/, 1]
observed_class_name.constantize
else
nil
end
end
end
def initialize
Set.new(observed_classes).each { |klass| add_observer! klass }
end
def update(observed_method, object) #:nodoc:
send(observed_method, object) if respond_to?(observed_method)
end
protected
def observed_classes
Set.new([self.class.observed_class].compact.flatten)
end
def add_observer!(klass)
klass.add_observer(self)
end
end
end
Version data entries
90 entries across 90 versions & 14 rubygems