diff options
Diffstat (limited to 'activerecord/lib')
| -rw-r--r-- | activerecord/lib/active_record/observer.rb | 23 |
1 files changed, 12 insertions, 11 deletions
diff --git a/activerecord/lib/active_record/observer.rb b/activerecord/lib/active_record/observer.rb index 856d3fc968..698b3ff412 100644 --- a/activerecord/lib/active_record/observer.rb +++ b/activerecord/lib/active_record/observer.rb @@ -1,10 +1,11 @@ require 'singleton' module ActiveRecord - # Observers can be programmed to react to lifecycle callbacks in another class to implement - # trigger-like behavior outside the original class. This is a great way to reduce the clutter that - # normally comes when the model class is burdened with excess responsibility that doesn't pertain to - # the core and nature of the class. Example: + # Observer classes respond to lifecycle callbacks to implement trigger-like + # behavior outside the original class. This is a great way to reduce the + # clutter that normally comes when the model class is burdened with + # functionality that doesn't pertain to the core responsibility of the + # class. Example: # # class CommentObserver < ActiveRecord::Observer # def after_save(comment) @@ -12,13 +13,13 @@ module ActiveRecord # end # end # - # This Observer is triggered when a Comment#save is finished and sends a notification about it to the administrator. + # This Observer sends an email when a Comment#save is finished. # - # == Observing a class that can't be infered + # == Observing a class that can't be inferred # # Observers will by default be mapped to the class with which they share a name. So CommentObserver will # be tied to observing Comment, ProductManagerObserver to ProductManager, and so on. If you want to name your observer - # something else than the class you're interested in observing, you can implement the observed_class class method. Like this: + # differently than the class you're interested in observing, you can use the Observer.observe class method: # # class AuditObserver < ActiveRecord::Observer # observe Account @@ -28,9 +29,7 @@ module ActiveRecord # end # end # - # == Observing multiple classes at once - # - # If the audit observer needs to watch more than one kind of object, this can be specified in an array, like this: + # If the audit observer needs to watch more than one kind of object, this can be specified with multiple arguments: # # class AuditObserver < ActiveRecord::Observer # observe Account, Balance @@ -42,6 +41,8 @@ module ActiveRecord # # The AuditObserver will now act on both updates to Account and Balance by treating them both as records. # + # == Available callback methods + # # The observer can implement callback methods for each of the methods described in the Callbacks module. class Observer include Singleton @@ -75,4 +76,4 @@ module ActiveRecord self.class.name.scan(/(.*)Observer/)[0][0] end end -end
\ No newline at end of file +end |