Concatenate strings in UrlMappings?

I'm trying to create separate controllers for admin in my application. So far I've got something like this :

"/admin/article/$action?/$id?"(controller:"adminArticle")
"/admin/comment/$action?/$id?"(controller:"adminComment")

And so on for all the admin controllers. I would like to make it simpler, tried :

"/admin/$controller?/$action?/$id?"(controller:"admin" + controller[0].toUpperCase() + controller[1..-1])

and

"/admin/$controller/$action?/$id?"(controller:"admin$controller")

but neither of thi开发者_开发问答s solutions worked. Have you any idea how can I make this mappings more dynamic?

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You can customize the controller value if you use a closure.

/$mode/$contr"{
  action = "someAction"
  controller = {
    if (params.mode == "api") {
      return params.contr+"API"
    } 
    else {
      return params.contr
    }
  }
  constraints {
    mode inList:["menu", "api"]
  }
}

I hope this helps!

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Maybe you should not use the word "controller". I didn't try it, but this could work:

"/admin/$contr/$action?/$id?"(controller:"admin$contr") // if first letter of contr is upper case