Fix nested attribute loading from anonymous classes under Ruby 1.9

In Ruby 1.8, anonymous classes have an empty string for a name. In Ruby 1.9, name is nil. This causes an error when loading nested attributes from an anonymous class as we determine its namespace. Stringify the name before we try to split it.

lib/active_resource/base.rb

@@ -1490,7 +1490,7 @@ def find_or_create_resource_for(name)
         if self.class.const_defined?(*const_args)
           self.class.const_get(*const_args)
         else
-          ancestors = self.class.name.split("::")
+          ancestors = self.class.name.to_s.split("::")
           if ancestors.size > 1
             find_or_create_resource_in_modules(resource_name, ancestors)
           else

test/cases/base/load_test.rb

@@ -108,6 +108,12 @@ def test_load_one_with_unknown_resource
     assert_equal @first_address.values.first.stringify_keys, address.attributes
   end
 
+  def test_load_one_with_unknown_resource_from_anonymous_subclass
+    subclass = Class.new(Person).tap { |c| c.element_name = 'person' }
+    address = silence_warnings { subclass.new.load(@first_address).address }
+    assert_kind_of subclass::Address, address
+  end
+
   def test_load_collection_with_existing_resource
     addresses = @person.load(@addresses_from_json).street_addresses
     assert_kind_of Array, addresses