Ruby on Rails Routing URL params with a period
Example
If you want to support a url parameter more complex than an id number, you may run into trouble with the parser if the value contains a period. Anything following a period will be assumed to be a format (i.e. json, xml).
You can work around this limitation by using a constraint to broaden the accepted input.
For example, if you want to reference a user record by email address in the url:
resources :users, constraints: { id: /.*/ }
