Error RSpec ActionController::UrlGenerationError with Rails - ruby-on-rails

Question

I'm getting an error when trying to test a Rails Controller with RSpec. It's a double nested route and I'm trying to figure out the right syntax but hadn't had many luck yet.
The error that I'm getting is
Failure/Error: get :index, {category_id: category.to_param, id: system.to_param}
ActionController::UrlGenerationError:
No route matches {:action=>"index", :category_id=>"220", :controller=>"reviews", :id=>"166"}
# ./spec/controllers/reviews_controller_spec.rb:11:in `block (3 levels) in <top (required)>'
I've made the same test for the system controller which works fine. The webpage works fine as well. No errors with that (just this error with testing).
Here is what the RSpec test look like:
require 'rails_helper'
RSpec.describe ReviewsController, type: :controller do
let (:category) { create(:category) }
let (:system) { create(:system) }
let (:reviews) { create_list(:review, 3, category: category, system: system) }
describe "GET index" do
it "assigs all reviews to an instance var called #reviews" do
get :index, {category_id: category.to_param, id: system.to_param}
expect(assigns(:reviews)).to eq reviews
end
it "assigns all the reviews to an var called #system" do
get :index, system_id: system.to_param
expect(assigns(:system)).to eq system
end
end
describe "system scope" do
before { create(:review) }
it "only assigns reviews index in the current system" do
get :index, {category_id: category.to_param, id: system.to_param}
expect(assigns(:reviews)).to eq reviews
end
end
end
This is the Controller that it's testing:
class ReviewsController < ApplicationController
def index
#system = System.find(params[:system_id])
#reviews = #system.reviews
respond_to do |format|
format.html
format.json { render json: { system: #system, reviews: #reviews } }
end
end
def show
#system = System.find(params[:system_id])
#review = #system.reviews
end
end
And these are the routes:
Rails.application.routes.draw do
root "categories#index"
resources :categories do
resources :systems do
resources :reviews
end
end
end
Here are the models:
Category Model
class Category < ActiveRecord::Base
validates_presence_of :name
has_many :systems
end
System Model
class System < ActiveRecord::Base
belongs_to :category
has_many :reviews
validates_presence_of :name, :category
end
Review Model
class Review < ActiveRecord::Base
belongs_to :system
validates_presence_of :content, :system
end

Answer 1

ActionController::UrlGenerationError: No route matches
{:action=>"index", :category_id=>"220", :controller=>"reviews",
:id=>"166"}
According to your routes, that particular index route expects category_id and system_id as keys. You need to change :id to :system_id. The below should work.
it "only assigns reviews index in the current system" do
get :index, {category_id: category.to_param, system_id: system.to_param}
expect(assigns(:reviews)).to eq reviews
end
Update
NoMethodError: undefined method `category=' for
Review:0x005578a9e87188
There is no association between a review and a category. Edit your models to set the association accordingly.
#category.rb
class Category < ActiveRecord::Base
validates_presence_of :name
has_many :systems
has_many :reviews
end
#review.rb
class Review < ActiveRecord::Base
belongs_to :system
belongs_to :category
validates_presence_of :content, :system
end