diff options
Diffstat (limited to 'activesupport/lib/active_support/core_ext/module')
| -rw-r--r-- | activesupport/lib/active_support/core_ext/module/delegation.rb | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/activesupport/lib/active_support/core_ext/module/delegation.rb b/activesupport/lib/active_support/core_ext/module/delegation.rb index 19f692e943..d82758e40d 100644 --- a/activesupport/lib/active_support/core_ext/module/delegation.rb +++ b/activesupport/lib/active_support/core_ext/module/delegation.rb @@ -20,7 +20,8 @@ class Module # ==== Options # * <tt>:to</tt> - Specifies the target object # * <tt>:prefix</tt> - Prefixes the new method with the target name or a custom prefix - # * <tt>:allow_nil</tt> - if set to true, prevents a +NoMethodError+ from being raised + # * <tt>:allow_nil</tt> - if set to true, prevents a +Module::DelegationError+ + # from being raised # # The macro receives one or more method names (specified as symbols or # strings) and the name of the target object via the <tt>:to</tt> option @@ -112,18 +113,19 @@ class Module # invoice.customer_address # => 'Vimmersvej 13' # # If the target is +nil+ and does not respond to the delegated method a - # +NoMethodError+ is raised, as with any other value. Sometimes, however, it - # makes sense to be robust to that situation and that is the purpose of the - # <tt>:allow_nil</tt> option: If the target is not +nil+, or it is and - # responds to the method, everything works as usual. But if it is +nil+ and - # does not respond to the delegated method, +nil+ is returned. + # +Module::DelegationError+ is raised, as with any other value. Sometimes, + # however, it makes sense to be robust to that situation and that is the + # purpose of the <tt>:allow_nil</tt> option: If the target is not +nil+, or it + # is and responds to the method, everything works as usual. But if it is +nil+ + # and does not respond to the delegated method, +nil+ is returned. # # class User < ActiveRecord::Base # has_one :profile # delegate :age, to: :profile # end # - # User.new.age # raises NoMethodError: undefined method `age' + # User.new.age + # # => Module::DelegationError: User#age delegated to profile.age, but profile is nil # # But if not having a profile yet is fine and should not be an error # condition: |