Merge pull request #7613 from marcandre/delegate_to_class

Nice and easy delegation to the class

activesupport/lib/active_support/core_ext/module/delegation.rb

@@ -123,6 +123,9 @@ def delegate(*methods)
     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.

activesupport/test/core_ext/module_test.rb

@@ -34,6 +34,12 @@ class Someone < Struct.new(:name, :place)
   delegate :street, :city, :to_f, :to => :place
   delegate :name=, :to => :place, :prefix => true
   delegate :upcase, :to => "place.city"
+  delegate :table_name, :to => :class
+  delegate :table_name, :to => :class, :prefix => true
+
+  def self.table_name
+    'some_table'
+  end
 
   FAILED_DELEGATE_LINE = __LINE__ + 1
   delegate :foo, :to => :place
@@ -111,6 +117,11 @@ def test_delegation_to_instance_variable
     assert_equal "DAVID HANSSON", david.upcase
   end
 
+  def test_delegation_to_class_method
+    assert_equal 'some_table', @david.table_name
+    assert_equal 'some_table', @david.class_table_name
+  end
+
   def test_missing_delegation_target
     assert_raise(ArgumentError) do
       Name.send :delegate, :nowhere