Add notes on how to override the default :id constraint [#5994 state:resolved]

1 files changed, 4 insertions, 0 deletions

diff --git a/railties/guides/source/routing.textile b/railties/guides/source/routing.textile
index 28a207c436..d214031b31 100644
--- a/railties/guides/source/routing.textile
+++ b/railties/guides/source/routing.textile
@@ -391,6 +391,8 @@ NOTE: You can't use +namespace+ or +:module+ with a +:controller+ path segment.
 match ':controller(/:action(/:id))', :controller => /admin\/[^\/]+/
 </ruby>
 
+TIP: By default dynamic segments don't accept dots - this is because the dot is used as a separator for formatted routes. If you need to use a dot within a dynamic segment add a constraint which overrides this - for example +:id => /[^\/]+/+ allows anything except a slash.
+
 h4. Static Segments
 
 You can specify static segments when creating a route:
@@ -646,6 +648,8 @@ end
 
 NOTE: Of course, you can use the more advanced constraints available in non-resourceful routes in this context.
 
+TIP: By default the +:id+ parameter doesn't accept dots - this is because the dot is used as a separator for formatted routes. If you need to use a dot within an +:id+ add a constraint which overrides this - for example +:id => /[^\/]+/+ allows anything except a slash.
+
 h4. Overriding the Named Helpers
 
 The +:as+ option lets you override the normal naming for the named route helpers. For example: