diff options
Diffstat (limited to 'activemodel/lib/active_model/observing.rb')
-rw-r--r-- | activemodel/lib/active_model/observing.rb | 35 |
1 files changed, 21 insertions, 14 deletions
diff --git a/activemodel/lib/active_model/observing.rb b/activemodel/lib/active_model/observing.rb index 32f2aa46bd..f3781f7a68 100644 --- a/activemodel/lib/active_model/observing.rb +++ b/activemodel/lib/active_model/observing.rb @@ -4,6 +4,8 @@ require 'active_support/core_ext/module/aliasing' require 'active_support/core_ext/module/remove_method' require 'active_support/core_ext/string/inflections' require 'active_support/core_ext/enumerable' +require 'active_support/deprecation' +require 'active_support/core_ext/object/try' require 'active_support/descendants_tracker' module ActiveModel @@ -69,27 +71,34 @@ module ActiveModel end # Notify list of observers of a change. - def notify_observers(*arg) - observer_instances.each { |observer| observer.update(*arg) } + def notify_observers(*args) + observer_instances.each { |observer| observer.update(*args) } end # Total number of observers. - def count_observers + def observers_count observer_instances.size end + def count_observers + msg = "count_observers is deprecated in favor of observers_count" + ActiveSupport::Deprecation.warn(msg) + observers_count + end + protected def instantiate_observer(observer) #:nodoc: # string/symbol if observer.respond_to?(:to_sym) - observer.to_s.camelize.constantize.instance - elsif observer.respond_to?(:instance) + observer = observer.to_s.camelize.constantize + end + if observer.respond_to?(:instance) observer.instance else raise ArgumentError, - "#{observer} must be a lowercase, underscored class name (or an " + - "instance of the class itself) responding to the instance " + - "method. Example: Person.observers = :big_brother # calls " + + "#{observer} must be a lowercase, underscored class name (or " + + "the class itself) responding to the method :instance. " + + "Example: Person.observers = :big_brother # calls " + "BigBrother.instance" end end @@ -186,7 +195,7 @@ module ActiveModel def observe(*models) models.flatten! models.collect! { |model| model.respond_to?(:to_sym) ? model.to_s.camelize.constantize : model } - redefine_method(:observed_classes) { models } + singleton_class.redefine_method(:observed_classes) { models } end # Returns an array of Classes to observe. @@ -205,15 +214,12 @@ module ActiveModel # The class observed by default is inferred from the observer's class name: # assert_equal Person, PersonObserver.observed_class def observed_class - if observed_class_name = name[/(.*)Observer/, 1] - observed_class_name.constantize - else - nil - end + name[/(.*)Observer/, 1].try :constantize end end # Start observing the declared classes and their subclasses. + # Called automatically by the instance method. def initialize observed_classes.each { |klass| add_observer!(klass) } end @@ -242,6 +248,7 @@ module ActiveModel klass.add_observer(self) end + # Returns true if notifications are disabled for this object. def disabled_for?(object) klass = object.class return false unless klass.respond_to?(:observers) |