Ruby on Rails

On Sep 1, 7:03 am, 7stud -- <li...@ruby-forum.com> wrote:
> Conrad Taylor wrote in post #1019592:
>
> > On Thu, Sep 1, 2011 at 1:53 AM, 7stud -- <li...@ruby-forum.com> wrote:
>
> >> > The above can easily be fixed by adding a $ after the *.  For example,
>
> >> > /^[1-9]\d*$/
>
> >> Why do you continue to claim that you can use anchors in a constraint?
>
> > In regards to Rails routing, the start anchor ^ is implied as stated in
> > section
> > 3.8 of the routing documentation.
>
> Nevertheless, you can't use anchors in the regex which you specify for a
> constraint, or you will get an error:
>
> ArgumentError
> Regexp anchor characters are not allowed in routing requirements:
> /^[1-9]\d*/
>

Yes, this is correct and it's the current expected behavior.

> Even though I tested the regex constraint before, I am now getting
> different results--they show that the regex has an implied anchor at
> both the beginning and at the end of the regex.  For instance, if this
> is the only route in my routes.db file:
>
>  match "/users/:id" => "users#show",
>                         :constraints => {:id => /[1-9]\d*/}
>
> ...then the following urls match:
>
> http://localhost:3000/users/1http://localhost:3000/users/10
>
> but these urls do not match:
>
> http://localhost:3000/users/a1http://localhost:3000/users/1ahttp://localhost:3000/users/aahttp://localhost:3000/users/01
>
> They produce a routing error:
>
>   No route matches "/users/xx"
>
> If there was no implied 'begining of string' anchor in the regex, then
> the url:
>
> http://localhost:3000/users/a1
>
> would match.  And if there was no implied 'end of string' anchor in the
> regex, then the url:
>
> http://localhost:3000/users/1a
>
> would match.
>
> With the following route being the only route in my routes.rb file:
>
>   resources :users
>
> ...then all the following urls match:
>
> http://localhost:3000/users/1http://localhost:3000/users/a1http://localhost:3000/users/1ahttp://localhost:3000/users/aahttp://localhost:3000/users/01
>
> Just about any characters will match in the :id position.   So,  Jim
> ruther Nill gave Bruno the right suggestion from the start.

Yes, this is exactly what I instructed Bruno to do in my initial
response to his question.

-Conrad

>
> --
> Posted viahttp://www.ruby-forum.com/.

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