Correctly display rack apps with dynamic constraints in RoutesInspector

If you used dynamic constraint like that:

  scope :constraint => MyConstraint.new do
    mount RackApp => "/foo"
  end

routes were not displayed correctly when using `rake routes`.
This commit fixes it. If you want nice display of dynamic
constraints in `rake routes` output, please just override
to_s method in your constraint's class.

1 files changed, 17 insertions, 0 deletions

diff --git a/railties/test/application/route_inspect_test.rb b/railties/test/application/route_inspect_test.rb
index 2ad5ee6c4c..6503251b9f 100644
--- a/railties/test/application/route_inspect_test.rb
+++ b/railties/test/application/route_inspect_test.rb
@@ -127,5 +127,22 @@ module ApplicationTests
       output = @inspector.format @set.routes
       assert_equal ["  /foo/:id(.:format) #{RackApp.name} {:id=>/[A-Z]\\d{5}/}"], output
     end
+
+    def test_rake_routes_shows_route_with_rack_app_nested_with_dynamic_constraints
+      constraint = Class.new do
+        def to_s
+          "( my custom constraint )"
+        end
+      end
+
+      @set.draw do
+        scope :constraint => constraint.new do
+          mount RackApp => '/foo'
+        end
+      end
+
+      output = @inspector.format @set.routes
+      assert_equal ["  /foo #{RackApp.name} {:constraint=>( my custom constraint )}"], output
+    end
   end
 end