Add documentation for redirect_to :back's RedirectBackError exception.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@4267 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

1 files changed, 4 insertions, 0 deletions

diff --git a/actionpack/lib/action_controller/base.rb b/actionpack/lib/action_controller/base.rb
index 5302ee6cad..3ed99ba793 100755
--- a/actionpack/lib/action_controller/base.rb
+++ b/actionpack/lib/action_controller/base.rb
@@ -850,6 +850,10 @@ module ActionController #:nodoc:
       #   redirect_to :back
       #
       # The redirection happens as a "302 Moved" header.
+      #
+      # When using <tt>redirect_to :back</tt>, if there is no referrer,
+      # RedirectBackError will be raised. You may specify some fallback
+      # behavior for this case by rescueing RedirectBackError.
       def redirect_to(options = {}, *parameters_for_method_reference) #:doc:
         case options
           when %r{^\w+://.*}