Set idName correctly when using nested routes and dasherize

src/Routing/RouteBuilder.php

@@ -344,7 +344,7 @@ class RouteBuilder
         }
 
         if (is_callable($callback)) {
-            $idName = Inflector::singularize($urlName) . '_id';
+            $idName = Inflector::underscore(Inflector::singularize($name)) . '_id';
             $path = '/' . $urlName . '/:' . $idName;
             $this->scope($path, [], $callback);
         }