From afa68eb1766d8893a1bb79bf989061f3d8f98049 Mon Sep 17 00:00:00 2001
From: Carl Lerche <me@carllerche.com>
Date: Tue, 10 Jul 2012 16:16:00 -0700
Subject: Raise a helpful error message on #mount misuse

---
 actionpack/lib/action_dispatch/routing/mapper.rb | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'actionpack/lib')

diff --git a/actionpack/lib/action_dispatch/routing/mapper.rb b/actionpack/lib/action_dispatch/routing/mapper.rb
index 53a4afecb3..a49b12621e 100644
--- a/actionpack/lib/action_dispatch/routing/mapper.rb
+++ b/actionpack/lib/action_dispatch/routing/mapper.rb
@@ -430,6 +430,10 @@ module ActionDispatch
           if options
             path = options.delete(:at)
           else
+            unless Hash === app
+              raise ArgumentError, "must be called with mount point"
+            end
+
             options = app
             app, path = options.find { |k, v| k.respond_to?(:call) }
             options.delete(app) if app
-- 
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