gistfile1.txt

# The test that is failing

require 'rails_helper'

RSpec.describe "Users can leave comments" do
  let(:user) { FactoryGirl.create(:user) }
  let(:topic) { FactoryGirl.create(:topic, author: user, forum: forum) }
  let(:forum) { FactoryGirl.create(:forum) }
  
  before do
    login_as(user)
    visit forum_topic_path(forum, topic)
  end
  
  scenario 'with valid attributes' do
    click_link "Add Comment"
    fill_in "Text", with: "This is some random text for a comment"
    click_button "Create Comment"
    
    expect(page).to have_content "Comment has been created."
  end
end

gistfile2.txt

# The error message

undefined method `comments_path' for #<#<Class:0x007f01f0513be8>:0x00000003b43928>

Did you mean?  font_path
Extracted source (around line #1):
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<%= simple_form_for([@topic, @comment]) do |f| %>
  <%= f.input :text %>
  
  <%= f.button :submit, class: "new btn-primary" %>
<% end %>

gistfile3.txt

# The routes, in case there is something wrong here.

Rails.application.routes.draw do
  root 'forums#index'
  
  namespace :admin do
    resources :users
    root 'application#index'
    get '/admin/forums' => "forums#index"
    
    resources :forums
  end

  devise_for :users
  
  resources :forums, only: [:show, :index] do
    resources :topics
  end
  
  resources :topics, only: [] do
    resources :comments, only: [:create, :new, :destroy, :edit]
  end
end

gistfile4.txt

mfifth:~/workspace $ rake routes
                  Prefix Verb   URI Pattern                                   Controller#Action
                    root GET    /                                             forums#index
             admin_users GET    /admin/users(.:format)                        admin/users#index
                         POST   /admin/users(.:format)                        admin/users#create
          new_admin_user GET    /admin/users/new(.:format)                    admin/users#new
         edit_admin_user GET    /admin/users/:id/edit(.:format)               admin/users#edit
              admin_user GET    /admin/users/:id(.:format)                    admin/users#show
                         PATCH  /admin/users/:id(.:format)                    admin/users#update
                         PUT    /admin/users/:id(.:format)                    admin/users#update
                         DELETE /admin/users/:id(.:format)                    admin/users#destroy
              admin_root GET    /admin(.:format)                              admin/application#index
      admin_admin_forums GET    /admin/admin/forums(.:format)                 admin/forums#index
            admin_forums GET    /admin/forums(.:format)                       admin/forums#index
                         POST   /admin/forums(.:format)                       admin/forums#create
         new_admin_forum GET    /admin/forums/new(.:format)                   admin/forums#new
        edit_admin_forum GET    /admin/forums/:id/edit(.:format)              admin/forums#edit
             admin_forum GET    /admin/forums/:id(.:format)                   admin/forums#show
                         PATCH  /admin/forums/:id(.:format)                   admin/forums#update
                         PUT    /admin/forums/:id(.:format)                   admin/forums#update
                         DELETE /admin/forums/:id(.:format)                   admin/forums#destroy
        new_user_session GET    /users/sign_in(.:format)                      devise/sessions#new
            user_session POST   /users/sign_in(.:format)                      devise/sessions#create
    destroy_user_session DELETE /users/sign_out(.:format)                     devise/sessions#destroy
           user_password POST   /users/password(.:format)                     devise/passwords#create
       new_user_password GET    /users/password/new(.:format)                 devise/passwords#new
      edit_user_password GET    /users/password/edit(.:format)                devise/passwords#edit
                         PATCH  /users/password(.:format)                     devise/passwords#update
                         PUT    /users/password(.:format)                     devise/passwords#update
cancel_user_registration GET    /users/cancel(.:format)                       devise/registrations#cancel
       user_registration POST   /users(.:format)                              devise/registrations#create
   new_user_registration GET    /users/sign_up(.:format)                      devise/registrations#new
  edit_user_registration GET    /users/edit(.:format)                         devise/registrations#edit
                         PATCH  /users(.:format)                              devise/registrations#update
                         PUT    /users(.:format)                              devise/registrations#update
                         DELETE /users(.:format)                              devise/registrations#destroy
            forum_topics GET    /forums/:forum_id/topics(.:format)            topics#index
                         POST   /forums/:forum_id/topics(.:format)            topics#create
         new_forum_topic GET    /forums/:forum_id/topics/new(.:format)        topics#new
        edit_forum_topic GET    /forums/:forum_id/topics/:id/edit(.:format)   topics#edit
             forum_topic GET    /forums/:forum_id/topics/:id(.:format)        topics#show
                         PATCH  /forums/:forum_id/topics/:id(.:format)        topics#update
                         PUT    /forums/:forum_id/topics/:id(.:format)        topics#update
                         DELETE /forums/:forum_id/topics/:id(.:format)        topics#destroy
                  forums GET    /forums(.:format)                             forums#index
                   forum GET    /forums/:id(.:format)                         forums#show
          topic_comments POST   /topics/:topic_id/comments(.:format)          comments#create
       new_topic_comment GET    /topics/:topic_id/comments/new(.:format)      comments#new
      edit_topic_comment GET    /topics/:topic_id/comments/:id/edit(.:format) comments#edit
           topic_comment DELETE /topics/:topic_id/comments/:id(.:format)      comments#destroy
mfifth:~/workspace $