RSpec: Controller spec with polymorphic resource, "No route matches" error - ruby-on-rails

Question

I'm learning RSpec by writing specs for an existing project. I'm having trouble with a controller spec for a polymorphic resource Notes. Virtually any other model can have a relationship with Notes like this: has_many :notes, as: :noteable
In addition, the app is multi-tenant, where each Account can have many Users. Each Account is accessed by :slug instead of :id in the URL. So my mulit-tenant, polymorphic routing looks like this:
# config/routes.rb
...
scope ':slug', module: 'accounts' do
...
resources :customers do
resources :notes
end
resources :products do
resources :notes
end
end
This results in routes like this for the :new action
new_customer_note GET /:slug/customers/:customer_id/notes/new(.:format) accounts/notes#new
new_product_note GET /:slug/products/:product_id/notes/new(.:format) accounts/notes#new
Now on to the testing problem. First, here's an example of how I test other non-polymorphic controllers, like invitations_controller:
# from spec/controllers/accounts/invitation_controller_spec.rb
require 'rails_helper'
describe Accounts::InvitationsController do
describe 'creating and sending invitation' do
before :each do
#owner = create(:user)
sign_in #owner
#account = create(:account, owner: #owner)
end
describe 'GET #new' do
it "assigns a new Invitation to #invitation" do
get :new, slug: #account.slug
expect(assigns(:invitation)).to be_a_new(Invitation)
end
end
...
end
When i try to use a similar approach to test the polymorphic notes_controller, I get confused :-)
# from spec/controllers/accounts/notes_controller_spec.rb
require 'rails_helper'
describe Accounts::NotesController do
before :each do
#owner = create(:user)
sign_in #owner
#account = create(:account, owner: #owner)
#noteable = create(:customer, account: #account)
end
describe 'GET #new' do
it 'assigns a new note to #note for the noteable object' do
get :new, slug: #account.slug, noteable: #noteable # no idea how to fix this :-)
expect(:note).to be_a_new(:note)
end
end
end
Here I'm just creating a Customer as #noteable in the before block, but it could just as well have been a Product. When I run rspec, I get this error:
No route matches {:action=>"new", :controller=>"accounts/notes", :noteable=>"1", :slug=>"nicolaswisozk"}
I see what the problem is, but i just can't figure out how to address the dynamic parts of the URL, like /products/ or /customers/.
Any help is appreciated :-)
UPDATE:
Changed the get :new line as requested below to
get :new, slug: #account.slug, customer_id: #noteable
and this causes the error
Failure/Error: expect(:note).to be_a_new(:note)
TypeError:
class or module required
# ./spec/controllers/accounts/notes_controller_spec.rb:16:in `block (3 levels) in <top (required)>'
Line 16 in the spec is:
expect(:note).to be_a_new(:note)
Could this be because the :new action in my notes_controller.rb is not just a #note = Note.new, but is initializing a new Note on a #noteable, like this?:
def new
#noteable = find_noteable
#note = #noteable.notes.new
end

Answer 1

Well the problem here should be that in this line
get :new, slug: #account.slug, noteable: #noteable
you are passing :noteable in params. But, you need to pass all the dynamic parts of the url instead to help rails match the routes. Here you need to pass :customer_id in params. Like this,
get :new, slug: #account.slug, customer_id: #noteable.id
Please let me know if this helps.