backbone.js - URLからIDを取得する方法

Question

Backbone Marionette Web アプリを開発しています。このアプリでは、次のようなルートを取得しました。

projects/:id/tasks

そのルートの ID (URL) を取得するにはどうすればよいですか?

これを使用すると、URL全体が取得されます:

Backbone.history.fragment

アップデート

これが、プロジェクトのルートを定義する方法です。

@Projectapp.module "ProjectsApp", (ProjectsApp, App, Backbone, Marionette, $, _) ->

    class ProjectsApp.Router extends Marionette.AppRouter
        appRoutes:
            "projects/new" : "newProject"
            "projects/:id" : "showProject"
            "projects/:id/edit" : "editProject"
            "projects" : "listProjects"

    API =
        listProjects: ->
            new ProjectsApp.List.Controller

        newProject: ->
            new ProjectsApp.New.Controller

        showProject: (id, project) ->
            new ProjectsApp.Show.Controller
                id: id
                project: project

        editProject: (id, project) ->
            new ProjectsApp.Edit.Controller
                id: id
                project: project

    App.Router.on "route:newProject", (project_id) ->
        alert project_id

    App.commands.setHandler "new:crew:member", (region) ->
        API.newCrew region

    App.vent.on "project:new:clicked", (project) ->
        App.navigate "projects/new", true

    App.vent.on "project:tasks:clicked", (project) ->
        App.navigate "projects/#{project.id}/tasks", true

    App.vent.on "project:created", (project) ->
        App.navigate "projects/#{project.id}", true

    App.vent.on "project:show:clicked project:back:clicked", (project) ->
        App.navigate "projects/#{project.id}"
        API.showProject project.id, project

    App.vent.on "project:clicked project:edit:clicked", (project) ->
        App.navigate "projects/#{project.id}/edit"
        API.editProject project.id, project

    App.vent.on "project:cancelled project:list:back:clicked", (project) ->
        App.navigate "projects"
        API.listProjects()

    App.addInitializer ->
        new ProjectsApp.Router
            controller: API