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 | 36 |
1 files changed, 25 insertions, 11 deletions
diff --git a/activesupport/lib/active_support/core_ext/module/delegation.rb b/activesupport/lib/active_support/core_ext/module/delegation.rb index 39a1240c61..e608eeaf42 100644 --- a/activesupport/lib/active_support/core_ext/module/delegation.rb +++ b/activesupport/lib/active_support/core_ext/module/delegation.rb @@ -18,7 +18,7 @@ class Module # # class Foo < ActiveRecord::Base # belongs_to :greeter - # delegate :hello, :to => :greeter + # delegate :hello, to: :greeter # end # # Foo.new.hello # => "hello" @@ -28,7 +28,7 @@ class Module # # class Foo < ActiveRecord::Base # belongs_to :greeter - # delegate :hello, :goodbye, :to => :greeter + # delegate :hello, :goodbye, to: :greeter # end # # Foo.new.goodbye # => "goodbye" @@ -43,15 +43,27 @@ class Module # def initialize # @instance_array = [8,9,10,11] # end - # delegate :sum, :to => :CONSTANT_ARRAY - # delegate :min, :to => :@@class_array - # delegate :max, :to => :@instance_array + # delegate :sum, to: :CONSTANT_ARRAY + # delegate :min, to: :@@class_array + # delegate :max, to: :@instance_array # end # # Foo.new.sum # => 6 # Foo.new.min # => 4 # Foo.new.max # => 11 # + # It's also possible to delegate a method to the class by using +:class+: + # + # class Foo + # def self.hello + # "world" + # end + # + # delegate :hello, to: :class + # end + # + # Foo.new.hello # => "world" + # # Delegates can optionally be prefixed using the <tt>:prefix</tt> option. If the value # is <tt>true</tt>, the delegate methods are prefixed with the name of the object being # delegated to. @@ -59,7 +71,7 @@ class Module # Person = Struct.new(:name, :address) # # class Invoice < Struct.new(:client) - # delegate :name, :address, :to => :client, :prefix => true + # delegate :name, :address, to: :client, prefix: true # end # # john_doe = Person.new('John Doe', 'Vimmersvej 13') @@ -70,7 +82,7 @@ class Module # It is also possible to supply a custom prefix. # # class Invoice < Struct.new(:client) - # delegate :name, :address, :to => :client, :prefix => :customer + # delegate :name, :address, to: :client, prefix: :customer # end # # invoice = Invoice.new(john_doe) @@ -86,7 +98,7 @@ class Module # def initialize(bar = nil) # @bar = bar # end - # delegate :zoo, :to => :bar + # delegate :zoo, to: :bar # end # # Foo.new.zoo # raises NoMethodError exception (you called nil.zoo) @@ -96,15 +108,14 @@ class Module # def initialize(bar = nil) # @bar = bar # end - # delegate :zoo, :to => :bar, :allow_nil => true + # delegate :zoo, to: :bar, allow_nil: true # end # # Foo.new.zoo # returns nil - # def delegate(*methods) options = methods.pop unless options.is_a?(Hash) && to = options[: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).' + raise ArgumentError, 'Delegation needs a target. Supply an options hash with a :to key as the last argument (e.g. delegate :hello, to: :greeter).' end prefix, allow_nil = options.values_at(:prefix, :allow_nil) @@ -123,6 +134,9 @@ class Module file, line = caller.first.split(':', 2) line = line.to_i + to = to.to_s + to = 'self.class' if to == 'class' + methods.each do |method| # Attribute writer methods only accept one argument. Makes sure []= # methods still accept two arguments. |