Rails Route only with numeric param

Question

i have in my application a custom route, that need to match everytime the param is a number or an list of numbers splited by |

this is my code:

get '/lists' => 'cidades#list'
get '/list(/:id)' => 'cidades#list', :constraints => { :id => /[0-9|]+/ }
get '/list(/:name)' => 'cidades#list'

what i hope to accomplish is something like this:

/lists => cidades#list

/list/1 => cidades#list & param[:id] = "1"
/list/1|2|3|4 => cidades#list & param[:id] = "1|2|3|4"

/list/1a => cidades#list & param[:name] = "1a"

if i use this regexp: /[0-9|]+/ i get 1a to be valid, but i don't want this. I find this regexp: /\A[0-9|]+\Z/ but this gives me this error:

ArgumentError (Regexp anchor characters are not allowed in routing requirements: /\A[0-9|]+\Z/):

how can i create a constraint that will only match a numeric string? ( a string with only numbers )

Answer 1

By default rails anchors the routing regular expressions so there is no need for the \A and \Z. I think you're looking for something that follows this pattern:

:constraints => { :id => /[0-9]+(\%7C[0-9]+)*/ }

This will force the route to have at least one integer (0-9). Optionally, the route can be followed by a | character (which is converted to %7C by the browser). The | character is then followed by an additional integer (0-9). Putting this patter in its own group prevents having any lingering | after the integer ids.