Support for loading routes from engines

Adding a recursion for getting routes form mounted engines.

Also checking if we need to add the api_base_url to the path instead
of removing the api_base_url when loading the path from routes:
doesn't play well with inheritance of api_base_url.

lib/apipie/application.rb

@@ -29,17 +29,26 @@ def set_resource_id(controller, resource_id)
       @controller_to_resource_id[controller] = resource_id
     end
 
-    def apipie_routes
-      unless @apipie_api_routes
-        # ensure routes are loaded
-        Rails.application.reload_routes! unless Rails.application.routes.routes.any?
-
-        regex = Regexp.new("\\A#{Apipie.configuration.api_base_url.values.join('|')}")
-        @apipie_api_routes = Rails.application.routes.routes.select do |x|
-          regex =~ x.path.spec.to_s
+    def rails_routes(route_set = nil)
+      if route_set.nil? && @rails_routes
+        return @rails_routes
+      end
+      route_set ||= Rails.application.routes
+      # ensure routes are loaded
+      Rails.application.reload_routes! unless Rails.application.routes.routes.any?
+
+      flatten_routes = []
+
+      route_set.routes.each do |route|
+        if route.app.respond_to?(:routes) && route.app.routes.is_a?(ActionDispatch::Routing::RouteSet)
+          # recursively go though the moutned engines
+          flatten_routes.concat(rails_routes(route.app.routes))
+        else
+          flatten_routes << route
         end
       end
-      @apipie_api_routes
+
+      @rails_routes = flatten_routes
     end
 
     # the app might be nested when using contraints, namespaces etc.
@@ -50,10 +59,12 @@ def route_app_controller(app, route)
       elsif app.respond_to?(:app)
         return route_app_controller(app.app, route)
       end
+    rescue ActionController::RoutingError
+      # some errors in the routes will not stop us here: just ignoring
     end
 
     def routes_for_action(controller, method, args)
-      routes = apipie_routes.select do |route|
+      routes = rails_routes.select do |route|
         controller == route_app_controller(route.app, route) &&
             method.to_s == route.defaults[:action]
       end

lib/apipie/method_description.rb

@@ -104,7 +104,10 @@ def doc_url
     end
 
     def create_api_url(api)
-      path = "#{@resource._api_base_url}#{api.path}"
+      path = api.path
+      unless path.start_with?(@resource._api_base_url)
+        path = "#{@resource._api_base_url}#{path}"
+      end
       path = path[0..-2] if path[-1..-1] == '/'
       return path
     end