Methods
Public Instance methods
Instantiate the global Active Record observers.
[ show source ]
# File activerecord/lib/active_record/observer.rb, line 34
34: def instantiate_observers
35: return if @observers.blank?
36: @observers.each do |observer|
37: if observer.respond_to?(:to_sym) # Symbol or String
38: observer.to_s.camelize.constantize.instance
39: elsif observer.respond_to?(:instance)
40: observer.instance
41: else
42: 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 BigBrother.instance"
43: end
44: end
45: end
Gets the current observers.
[ show source ]
# File activerecord/lib/active_record/observer.rb, line 29
29: def observers
30: @observers ||= []
31: end
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.
[ show source ]
# File activerecord/lib/active_record/observer.rb, line 24
24: def observers=(*observers)
25: @observers = observers.flatten
26: end
Protected Instance methods
Notify observers when the observed class is subclassed.
[ show source ]
# File activerecord/lib/active_record/observer.rb, line 49
49: def inherited(subclass)
50: super
51: changed
52: notify_observers :observed_class_inherited, subclass
53: end