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authorDaniel Schierbeck <daniel.schierbeck@gmail.com>2011-08-29 13:07:03 +0200
committerDaniel Schierbeck <dasch@zendesk.com>2012-04-12 13:47:52 +0200
commit1bac04e854b42fc0e47162e251105434d356d2b4 (patch)
tree6efbf7e413dd4dd7346ed4945283efd6d0fb15c8
parent1db54dffaffb83c7a1dacb4db7e4204c7bd1ddba (diff)
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Optimize the performance of #delegate
Remove the use of #__send__ in order to boost performance. This also means that you can no longer delegate to private methods on the target object.
-rw-r--r--activesupport/lib/active_support/core_ext/module/delegation.rb22
-rw-r--r--activesupport/test/core_ext/module_test.rb19
2 files changed, 32 insertions, 9 deletions
diff --git a/activesupport/lib/active_support/core_ext/module/delegation.rb b/activesupport/lib/active_support/core_ext/module/delegation.rb
index af92b869fd..0ea58d4224 100644
--- a/activesupport/lib/active_support/core_ext/module/delegation.rb
+++ b/activesupport/lib/active_support/core_ext/module/delegation.rb
@@ -124,23 +124,27 @@ class Module
file, line = caller.first.split(':', 2)
line = line.to_i
- if allow_nil
- methods.each do |method|
+ methods.each do |method|
+ method = method.to_s
+
+ # Attribute writer methods only accept one argument. Makes sure []=
+ # methods still accept two arguments.
+ definition = (method =~ /[^\]]=$/) ? "arg" : "*args, &block"
+
+ if allow_nil
module_eval(<<-EOS, file, line - 2)
- def #{method_prefix}#{method}(*args, &block) # def customer_name(*args, &block)
+ def #{method_prefix}#{method}(#{definition}) # def customer_name(*args, &block)
if #{to} || #{to}.respond_to?(:#{method}) # if client || client.respond_to?(:name)
- #{to}.__send__(:#{method}, *args, &block) # client.__send__(:name, *args, &block)
+ #{to}.#{method}(#{definition}) # client.name(*args, &block)
end # end
end # end
EOS
- end
- else
- methods.each do |method|
+ else
exception = %(raise "#{self}##{method_prefix}#{method} delegated to #{to}.#{method}, but #{to} is nil: \#{self.inspect}")
module_eval(<<-EOS, file, line - 1)
- def #{method_prefix}#{method}(*args, &block) # def customer_name(*args, &block)
- #{to}.__send__(:#{method}, *args, &block) # client.__send__(:name, *args, &block)
+ def #{method_prefix}#{method}(#{definition}) # def customer_name(*args, &block)
+ #{to}.#{method}(#{definition}) # client.name(*args, &block)
rescue NoMethodError # rescue NoMethodError
if #{to}.nil? # if client.nil?
#{exception} # # add helpful message to the exception
diff --git a/activesupport/test/core_ext/module_test.rb b/activesupport/test/core_ext/module_test.rb
index 09ca4e7296..6e1b3ca010 100644
--- a/activesupport/test/core_ext/module_test.rb
+++ b/activesupport/test/core_ext/module_test.rb
@@ -60,6 +60,14 @@ Tester = Struct.new(:client) do
delegate :name, :to => :client, :prefix => false
end
+class ParameterSet
+ delegate :[], :[]=, :to => :@params
+
+ def initialize
+ @params = {:foo => "bar"}
+ end
+end
+
class Name
delegate :upcase, :to => :@full_name
@@ -83,6 +91,17 @@ class ModuleTest < ActiveSupport::TestCase
assert_equal "Fred", @david.place.name
end
+ def test_delegation_to_index_get_method
+ @params = ParameterSet.new
+ assert_equal "bar", @params[:foo]
+ end
+
+ def test_delegation_to_index_set_method
+ @params = ParameterSet.new
+ @params[:foo] = "baz"
+ assert_equal "baz", @params[:foo]
+ end
+
def test_delegation_down_hierarchy
assert_equal "CHICAGO", @david.upcase
end