How to set Rails routes on nested resources? - ruby-on-rails

Question

This may seem redundant because similar question has been asked here and here, but I haven't found a solution yet.
I am running an RSpec to test :update for api. When I run RSpec, it shows No Route Matches on my first test. All I need is to have the testing to have_http_status(401) for unauthenticated user. Rails can't figure out the routing.
Here is what the error says:
Failures:
1) PostsController unauthenticated user PUT update returns http unauthenticated
Failure/Error: put :update, topic_id: my_topic.id, post_id: my_post.id, post: {title: my_post.title, body: my_post.body}
ActionController::UrlGenerationError:
No route matches {:action=>"update", :controller=>"posts", :post=>{:title=>"Xdiwbu zuitsom prubmlhd oxmgtkb swphb ukije salhvk.", :body=>"Pjlb ywlzqv igdesqmw oqjgy mrwpye ujierxtn owqxbvt. Wzxu sjcikthg xare tcawzx tedmiqwf lewab. Twkeoun mos ophta fvae krmnsqe. Jxefyo ncd agj ieyanvt uehazwnk mtsi fbsm."}, :post_id=>"1", :topic_id=>"1"}
# ./spec/api/v1/controllers/posts_controller_spec.rb:11:in `block (3 levels) in <top (required)>'
Here is the RSpec (spec/api/v1/controllers/posts_controller_spec.rb)
require 'rails_helper'
RSpec.describe Api::PostsController, type: :controller do
let(:my_user) { create(:user) }
let(:my_topic) { create(:topic) }
let(:my_post) { create(:post, topic: my_topic, user: my_user) }
context "unauthenticated user" do
it "PUT update returns http unauthenticated" do
put :update, topic_id: my_topic.id, post_id: my_post.id, post: {title: my_post.title, body: my_post.body}
expect(response).to have_http_status(401)
end
...
Here are the routes:
namespace :api do
namespace :v1 do
resources :users, only: [:index, :show, :create, :update]
resources :topics, except: [:edit, :new] do
resources :posts, only: [:update, :create, :destroy]
end
end
end
And here is the first part of the test:
class Api::V1::PostsController < Api::V1::BaseController
before_action :authenticate_user, except: [:index, :show]
before_action :authorize_user, except: [:index, :show]
def update
post = Post.find(params[:id])
if post.update_attributes(post_params)
render json: post.to_json, status: 200
else
render json: {error: "Post update failed", status: 400}, status: 400
end
end
...
No matter what I change the RSpec, I can't get it to match the routes. Would you guys mind helping?
Thanks!!

Answer 1

2 things stand out to me.
1: The controller itself is namespaced under Api::V1. The controller in the spec however, is namespaced under just Api. This should be updated to match.
2: If you run rake routes, you'll notice a line like this:
PUT /api/v1/topics/:topic_id/posts/:id(.:format) api/v1/posts#update.
It's important to note the names being given after the : in that message. In here, it's stating that the ID of the topic should be supplied to the controller as topic_id, and the ID of the post should be supplied as just id. If you modify your put statement to be something more like put :update, topic_id: my_topic.id, id: my_post.id, post: {title: my_post.title, body: my_post.body}, it should work.