diff options
Diffstat (limited to 'activesupport/lib/active_support/core_ext/module/delegation.rb')
| -rw-r--r-- | activesupport/lib/active_support/core_ext/module/delegation.rb | 21 |
1 files changed, 13 insertions, 8 deletions
diff --git a/activesupport/lib/active_support/core_ext/module/delegation.rb b/activesupport/lib/active_support/core_ext/module/delegation.rb index df8aefea5a..381181b2f4 100644 --- a/activesupport/lib/active_support/core_ext/module/delegation.rb +++ b/activesupport/lib/active_support/core_ext/module/delegation.rb @@ -1,14 +1,19 @@ class Module # Provides a delegate class method to easily expose contained objects' methods # as your own. Pass one or more methods (specified as symbols or strings) - # and the name of the target object as the final <tt>:to</tt> option (also a symbol - # or string). At least one method and the <tt>:to</tt> option are required. + # and the name of the target object via the <tt>:to</tt> option (also a symbol + # or string). At least one method and the <tt>:to</tt> option are required. # # Delegation is particularly useful with Active Record associations: # # class Greeter < ActiveRecord::Base - # def hello() "hello" end - # def goodbye() "goodbye" end + # def hello + # "hello" + # end + # + # def goodbye + # "goodbye" + # end # end # # class Foo < ActiveRecord::Base @@ -72,9 +77,9 @@ class Module # invoice.customer_name # => "John Doe" # invoice.customer_address # => "Vimmersvej 13" # - # If the object to which you delegate can be nil, you may want to use the - # :allow_nil option. In that case, it returns nil instead of raising a - # NoMethodError exception: + # If the delegate object is +nil+ an exception is raised, and that happens + # no matter whether +nil+ responds to the delegated method. You can get a + # +nil+ instead with the +:allow_nil+ option. # # class Foo # attr_accessor :bar @@ -124,7 +129,7 @@ class Module #{to}.__send__(#{method.inspect}, *args, &block) # client.__send__(:name, *args, &block) rescue NoMethodError # rescue NoMethodError if #{to}.nil? # if client.nil? - #{on_nil} + #{on_nil} # return # depends on :allow_nil else # else raise # raise end # end |