diff options
| -rw-r--r-- | activemodel/lib/active_model/observing.rb | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/activemodel/lib/active_model/observing.rb b/activemodel/lib/active_model/observing.rb index c1ac4eb4af..cfe71074a5 100644 --- a/activemodel/lib/active_model/observing.rb +++ b/activemodel/lib/active_model/observing.rb @@ -56,6 +56,8 @@ module ActiveModel end # Add a new observer to the pool. + # The new observer needs to respond to 'update', otherwise it + # raises an +ArgumentError+ exception. def add_observer(observer) unless observer.respond_to? :update raise ArgumentError, "observer needs to respond to `update'" @@ -144,8 +146,8 @@ module ActiveModel # 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 differently than - # the class you're interested in observing, you can use the Observer.observe class - # method which takes either the concrete class (Product) or a symbol for that + # the class you're interested in observing, you can use the <tt>Observer.observe</tt> + # class method which takes either the concrete class (Product) or a symbol for that # class (:product): # # class AuditObserver < ActiveModel::Observer |