Fix ActiveRecord::NamedScope::Scope#respond_to? [#818 state:resolved]

Signed-off-by: Pratik Naik <pratiknaik@gmail.com>

activerecord/lib/active_record/named_scope.rb

@@ -103,7 +103,7 @@ class Scope
       attr_reader :proxy_scope, :proxy_options
 
       [].methods.each do |m|
-        unless m =~ /(^__|^nil\?|^send|^object_id$|class|extend|find|count|sum|average|maximum|minimum|paginate|first|last|empty?)/
+        unless m =~ /(^__|^nil\?|^send|^object_id$|class|extend|find|count|sum|average|maximum|minimum|paginate|first|last|empty?|respond_to?)/
           delegate m, :to => :proxy_found
         end
       end
@@ -140,6 +140,10 @@ def empty?
         @found ? @found.empty? : count.zero?
       end
 
+      def respond_to?(method)
+        super || @proxy_scope.respond_to?(method)
+      end
+
       protected
       def proxy_found
         @found || load_found

activerecord/test/cases/named_scope_test.rb

@@ -45,6 +45,12 @@ def test_delegates_finds_and_calculations_to_the_base_class
     assert_equal Topic.average(:replies_count), Topic.base.average(:replies_count)
   end
 
+  def test_scope_should_respond_to_own_methods_and_methods_of_the_proxy
+    assert Topic.approved.respond_to?(:proxy_found)
+    assert Topic.approved.respond_to?(:count)
+    assert Topic.approved.respond_to?(:length)
+  end
+
   def test_subclasses_inherit_scopes
     assert Topic.scopes.include?(:base)