Question

My nested resource are associated in the models and the routes.rb:

resources :foos do
  resources :bars
end

My app is routing ok, but I can’t seem to prove any assertions about my nested routes:

describe BarsController do

it "should have a route to 'show'" do
  assert_generates "/foos/bars/1", 
                   {controller: :bars, action: :show, id: "1"}
end

Here is the error:

Failure/Error: assert_generates "/foos/bars/1",
ActionController::RoutingError:
No route matches {:controller=>"bars", :action=>"show", :id=>"1"}

How do I test these nested routes?

Answer 1

When you run rake routes you should see that your nested routes look something like this:

foo_bar GET    /foos/:foo_id/bars/:id(.:format)      bars#show

So two parameters are required to match this route: foo_id and id. Since you’re only supplying the id, it’s failing to find a route.

Also, for testing routes in rspec, you may find it more useful to use the built-in routes_to matcher instead of falling back to assert_*, like this:

it "routes to the 'show' action" do
  { get: "/foos/123/bars/456" }.
    should route_to controller: "bars",
      action: "show",
      foo_id: "123",
      id: "456"
end