Showing a general list of booked users - ruby-on-rails

Question

I created an application where users can book a hour of training. I want to give to admin users the option to see a general list of booked users in every training hour.
Im trying to create this index, but it gives me the following error:
ActionController::UrlGenerationError in Trainings#index
No route
matches {:action=>"index", :controller=>"bookings", :training_id=>nil}
missing required keys: [:training_id]
Im trying to create this button at index of training, like this:
training index.html.erb view:
<h1>Hours</h1>
<ul class="trainings">
<% #trainings.each do |training| %>
<li>
<%= link_to training.hour, training_path(training) %>
</li>
<% end %>
</ul>
<%= render 'bookings/general_list' if logged_in? %>
_general_list.html.erb view:
<ul class="bookings">
<% #trainings.each do |training| %>
<%= link_to "General list", training_bookings_path(#training), class: "btn btn-primary" %>
<% end %>
</ul>
I would like to now how i can get this done, i think my idea is not working.
my routes.rb:
Rails.application.routes.draw do
root 'static_pages#home'
get '/signup', to: 'users#new'
get '/contact', to: 'static_pages#contact'
get '/about', to: 'static_pages#about'
get '/login', to: 'sessions#new'
post '/login', to: 'sessions#create'
delete '/logout', to: 'sessions#destroy'
resources :account_activations, only: [:edit]
resources :password_resets, only: [:new, :create, :edit, :update]
resources :users
resources :trainings do
resources :bookings
end
end
rake routes command:
Prefix Verb URI Pattern Controller#Action
root GET / static_pages#home
signup GET /signup(.:format) users#new
contact GET /contact(.:format) static_pages#contact
about GET /about(.:format) static_pages#about
login GET /login(.:format) sessions#new
POST /login(.:format) sessions#create
logout DELETE /logout(.:format) sessions#destroy
edit_account_activation GET /account_activations/:id/edit(.:format) account_activations#edit
password_resets POST /password_resets(.:format) password_resets#create
new_password_reset GET /password_resets/new(.:format) password_resets#new
edit_password_reset GET /password_resets/:id/edit(.:format) password_resets#edit
password_reset PATCH /password_resets/:id(.:format) password_resets#update
PUT /password_resets/:id(.:format) password_resets#update
users GET /users(.:format) users#index
POST /users(.:format) users#create
new_user GET /users/new(.:format) users#new
edit_user GET /users/:id/edit(.:format) users#edit
user GET /users/:id(.:format) users#show
PATCH /users/:id(.:format) users#update
PUT /users/:id(.:format) users#update
DELETE /users/:id(.:format) users#destroy
training_bookings GET /trainings/:training_id/bookings(.:format) bookings#index
POST /trainings/:training_id/bookings(.:format) bookings#create
new_training_booking GET /trainings/:training_id/bookings/new(.:format) bookings#new
edit_training_booking GET /trainings/:training_id/bookings/:id/edit(.:format) bookings#edit
training_booking GET /trainings/:training_id/bookings/:id(.:format) bookings#show
PATCH /trainings/:training_id/bookings/:id(.:format) bookings#update
PUT /trainings/:training_id/bookings/:id(.:format) bookings#update
DELETE /trainings/:training_id/bookings/:id(.:format) bookings#destroy
trainings GET /trainings(.:format) trainings#index
POST /trainings(.:format) trainings#create
new_training GET /trainings/new(.:format) trainings#new
edit_training GET /trainings/:id/edit(.:format) trainings#edit
training GET /trainings/:id(.:format) trainings#show
PATCH /trainings/:id(.:format) trainings#update
PUT /trainings/:id(.:format) trainings#update
DELETE /trainings/:id(.:format) trainings#destroy
Thanks.

Answer 1

In _general_list.html.erb you should change #training for training