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author | Genadi Samokovarov <gsamokovarov@gmail.com> | 2016-05-30 14:53:03 +0300 |
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committer | Genadi Samokovarov <gsamokovarov@gmail.com> | 2016-05-30 14:53:03 +0300 |
commit | a11a3861b474ef642ac48796572d6276436c7eb0 (patch) | |
tree | 5e7da0567079981991e9a23696c7d20faf4c9f2b /activesupport/lib/active_support/core_ext/module/delegation.rb | |
parent | e6ed3aaf437887bc25a1f715f21c5ca3ebbc966f (diff) | |
parent | 3f2e83d964fcb4cd7f7f2ed8fb2b2592ffc57647 (diff) | |
download | rails-a11a3861b474ef642ac48796572d6276436c7eb0.tar.gz rails-a11a3861b474ef642ac48796572d6276436c7eb0.tar.bz2 rails-a11a3861b474ef642ac48796572d6276436c7eb0.zip |
Merge branch 'master' into always-inherit-from-application-record
Diffstat (limited to 'activesupport/lib/active_support/core_ext/module/delegation.rb')
-rw-r--r-- | activesupport/lib/active_support/core_ext/module/delegation.rb | 65 |
1 files changed, 64 insertions, 1 deletions
diff --git a/activesupport/lib/active_support/core_ext/module/delegation.rb b/activesupport/lib/active_support/core_ext/module/delegation.rb index 24450cd221..7f968d10b5 100644 --- a/activesupport/lib/active_support/core_ext/module/delegation.rb +++ b/activesupport/lib/active_support/core_ext/module/delegation.rb @@ -148,7 +148,6 @@ class Module # Foo.new("Bar").name # raises NoMethodError: undefined method `name' # # The target method must be public, otherwise it will raise +NoMethodError+. - # def delegate(*methods, to: nil, prefix: nil, allow_nil: nil) unless to raise ArgumentError, 'Delegation needs a target. Supply an options hash with a :to key as the last argument (e.g. delegate :hello, to: :greeter).' @@ -212,4 +211,68 @@ class Module module_eval(method_def, file, line) end end + + # When building decorators, a common pattern may emerge: + # + # class Partition + # def initialize(first_event) + # @events = [ first_event ] + # end + # + # def people + # if @events.first.detail.people.any? + # @events.collect { |e| Array(e.detail.people) }.flatten.uniq + # else + # @events.collect(&:creator).uniq + # end + # end + # + # private + # def respond_to_missing?(name, include_private = false) + # @events.respond_to?(name, include_private) + # end + # + # def method_missing(method, *args, &block) + # @events.send(method, *args, &block) + # end + # end + # + # With `Module#delegate_missing_to`, the above is condensed to: + # + # class Partition + # delegate_missing_to :@events + # + # def initialize(first_event) + # @events = [ first_event ] + # end + # + # def people + # if @events.first.detail.people.any? + # @events.collect { |e| Array(e.detail.people) }.flatten.uniq + # else + # @events.collect(&:creator).uniq + # end + # end + # end + # + # The target can be anything callable withing the object. E.g. instance + # variables, methods, constants ant the likes. + def delegate_missing_to(target) + target = target.to_s + target = "self.#{target}" if DELEGATION_RESERVED_METHOD_NAMES.include?(target) + + module_eval <<-RUBY, __FILE__, __LINE__ + 1 + def respond_to_missing?(name, include_private = false) + #{target}.respond_to?(name, include_private) + end + + def method_missing(method, *args, &block) + if #{target}.respond_to?(method) + #{target}.public_send(method, *args, &block) + else + super + end + end + RUBY + end end |