Can't change root route rails

Question

I'm creating a simple Todo list application in rails and I have the next problem:

I have a task that belongs_to project I've created a template - projects/show.html.erb And I can't set it to be the root page of my app, as I can see from the debugger - root is always projects#index action

P.S. I need show to be the root page cause I can't use this form in index action

 <%= form_for [@project, @task],remote: true do |f| %>
          <%= f.input :body,class: 'form-control' %>
          <%= f.submit 'Add task', class: 'btn' %>
        <% end %>

projects controller

 class ProjectsController < ApplicationController
     before_action :load_project, only: [:show, :edit, :update, :destroy]
     before_action :authenticate_user!

     def index
        @projects = current_user.projects unless current_user.nil?
      end

      def show
        @task = @project.tasks.new
      end

      def new
        @project = current_user.projects.new
      end

      def edit
      end

      def create
        @project = current_user.projects.create(project_params)

        if @project.save
          redirect_to root_path
        else
          render :new
        end
      end

      def update
        if @project.update(project_params)
          redirect_to @project
        else
          render :edit
        end
      end

      def destroy
        @project.destroy
        redirect_to projects_path
      end

      private

    def load_project
      begin
        @project = Project.find(params[:id]) #raises an exception if project not found
      rescue ActiveRecord::RecordNotFound
        redirect_to projects_path
      end
    end

      def project_params
        params.require(:project).permit(:name, :user_id)
      end

end

Routes.rb

Rails.application.routes.draw do
  devise_for :users, :controllers => { :omniauth_callbacks => "callbacks" }
  # For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html
  root 'projects#index'


  resources :projects do
    resources :tasks
  end




end

And routes generated by rake routes

todo$ rake routes
                          Prefix Verb     URI Pattern                                    Controller#Action
                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_facebook_omniauth_authorize GET|POST /users/auth/facebook(.:format)                 callbacks#passthru
 user_facebook_omniauth_callback GET|POST /users/auth/facebook/callback(.:format)        callbacks#facebook
                   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
                            root GET      /                                              home#index
                   project_tasks GET      /projects/:project_id/tasks(.:format)          tasks#index
                                 POST     /projects/:project_id/tasks(.:format)          tasks#create
                new_project_task GET      /projects/:project_id/tasks/new(.:format)      tasks#new
               edit_project_task GET      /projects/:project_id/tasks/:id/edit(.:format) tasks#edit
                    project_task GET      /projects/:project_id/tasks/:id(.:format)      tasks#show
                                 PATCH    /projects/:project_id/tasks/:id(.:format)      tasks#update
                                 PUT      /projects/:project_id/tasks/:id(.:format)      tasks#update
                                 DELETE   /projects/:project_id/tasks/:id(.:format)      tasks#destroy
                        projects GET      /projects(.:format)                            projects#index
                                 POST     /projects(.:format)                            projects#create
                     new_project GET      /projects/new(.:format)                        projects#new
                    edit_project GET      /projects/:id/edit(.:format)                   projects#edit
                         project GET      /projects/:id(.:format)                        projects#show
                                 PATCH    /projects/:id(.:format)                        projects#update
                                 PUT      /projects/:id(.:format)                        projects#update
                                 DELETE   /projects/:id(.:format)                        projects#destroy

Answer 1

Why do you want the index to be show page? Well, how can you do that? The show action requires a id to be passed to the controller so that a particular project can be displayed to the user. How can you pass in a id when the user is requesting for /?

Does that make sense?

I would suggest you to leave the root to the index page. In the index view, link each project to its show page. Its unnecessary to have a nested form in the index page.

Or if you want to list all projects and tasks in the root page, modify your index view to loop through each project's tasks.

@projects.each do |project|
  # display project's information
  project.tasks.each do |task|
    # display the task information
    # display a new task button
  end
end

But you can't display the nested form like you asked. Because the form requires @project and @task which you can't determine in the index action. Maybe you can add remote: true to the "New task" and then trigger a JS response to render the form in a modal.

If this sounds new to you, please see https://launchschool.com/blog/the-detailed-guide-on-how-ajax-works-with-ruby-on-rails

This will walk through you using AJAX in your rails application.

Hope this helps!