Module: ActiveModel::Observing::ClassMethods
- Defined in:
- lib/active_model/observing.rb
Instance Method Summary collapse
- #add_observer(observer) ⇒ Object
- #count_observers ⇒ Object
-
#instantiate_observers ⇒ Object
Instantiate the global Active Record observers.
- #notify_observers(*arg) ⇒ Object
-
#observers ⇒ Object
Gets the current observers.
-
#observers=(*values) ⇒ Object
Active Model Observers Activation.
Instance Method Details
#add_observer(observer) ⇒ Object
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# File 'lib/active_model/observing.rb', line 42 def add_observer(observer) unless observer.respond_to? :update raise ArgumentError, "observer needs to respond to `update'" end @observer_instances ||= [] @observer_instances << observer end |
#count_observers ⇒ Object
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# File 'lib/active_model/observing.rb', line 58 def count_observers @observer_instances.size end |
#instantiate_observers ⇒ Object
Instantiate the global Active Record observers.
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# File 'lib/active_model/observing.rb', line 38 def instantiate_observers observers.each { |o| instantiate_observer(o) } end |
#notify_observers(*arg) ⇒ Object
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# File 'lib/active_model/observing.rb', line 50 def notify_observers(*arg) if defined? @observer_instances for observer in @observer_instances observer.update(*arg) end end end |
#observers ⇒ Object
Gets the current observers.
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# File 'lib/active_model/observing.rb', line 33 def observers @observers ||= [] end |
#observers=(*values) ⇒ Object
Active Model Observers Activation
Activates the observers assigned. Examples:
# Calls PersonObserver.instance
ActiveRecord::Base.observers = :person_observer
# Calls Cacher.instance and GarbageCollector.instance
ActiveRecord::Base.observers = :cacher, :garbage_collector
# Same as above, just using explicit class references
ActiveRecord::Base.observers = Cacher, GarbageCollector
Note: Setting this does not instantiate the observers yet. instantiate_observers
is called during startup, and before each development request.
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# File 'lib/active_model/observing.rb', line 28 def observers=(*values) @observers = values.flatten end |