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-rw-r--r--actionpack/lib/action_dispatch/routing/route_set.rb5
1 files changed, 5 insertions, 0 deletions
diff --git a/actionpack/lib/action_dispatch/routing/route_set.rb b/actionpack/lib/action_dispatch/routing/route_set.rb
index 1d09091dc7..963a9107da 100644
--- a/actionpack/lib/action_dispatch/routing/route_set.rb
+++ b/actionpack/lib/action_dispatch/routing/route_set.rb
@@ -240,6 +240,11 @@ module ActionDispatch
end
def eval_block(block)
+ if block.arity == 1
+ raise "You are using the old router DSL which has been removed in Rails 3.1. " <<
+ "Please check how to update your routes file at: http://www.engineyard.com/blog/2010/the-lowdown-on-routes-in-rails-3/ " <<
+ "or add the rails_legacy_mapper gem to your Gemfile"
+ end
mapper = Mapper.new(self)
if default_scope
mapper.with_default_scope(default_scope, &block)