行动控制器异常被捕获，NoMethodError在预订＃new

Question

我正在尝试制作一个应用程序，用户可以在一个小时的训练中制作一本书。

这是我的预约控制器：

class BookingsController < ApplicationController 
    before_action :load_training, only: [:create] 

    def new 
    @booking = Booking.new 
    @booking.training_id 
    end 

    def create 
    @booking = @training.bookings.build(booking_params) 
    @booking.user = current_user.id 

    if @booking.save 
     flash[:success] = "Book created" 
     redirect_to training_index_url 
    else 
     render 'new' 
    end 
    end 


    def index 
    @booking = Booking.all 
    end 


    def destroy 
    @booking = Booking.find(params[:id]) 
    @booking.destroy 
    flash[:success] = "Book deleted" 
    redirect_to training_index_url 
    end 



private 
    def booking_params 
    params.require(:booking).permit(:user_id, :training_id) 
    end 

    def load_training 
    @training = Training.find(params[:booking][:training_id]) 
    end 

end 

这是我的预订模式：

class Booking < ApplicationRecord 
    belongs_to :user 
    belongs_to :training 
    default_scope -> { order(created_at: :desc) } 
    validates :user_id, presence: true 
    validates :training_id, presence: true 



end 

当我试图使本书在训练中我得到以下错误：

NoMethodError in Bookings#new Showing /home/cesar/Apps/boxApp/app/views/bookings/new.html.erb where line #6 raised:

undefined method `bookings_path' for <#:0x0055c4717cc4d8> Did you mean? book_path

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' 
    get '/book',     to: 'bookings#new' 
    post '/book',     to: 'bookings#create' 
    delete '/unbook',    to: 'bookings#destroy' 


    resources :account_activations, only: [:edit] 
    resources :password_resets,  only: [:new, :create, :edit, :update] 

    resources :trainings do 
    resources :bookings 
    end 
    resources :users 
end 

我new.html.erb预订的看法：

<div class="row"> 
    <div class="col-md-6 col-md-offset-3"> 
<%= form_for ([@training, @booking]) do |f| %> 
<%= f.hidden_field :training_id %> 
<%= f.submit "Confirm book", class: "btn btn-primary" %> 
<% end %> 

我想现在为什么我得到这个错误，我该如何解决这样的书才能顺利完成。

的show.html.erb培训的看法：

<% provide(:title, 'Clase | Ludus app') %> 
<div class="row"> 
    <section> 
     <h1> 
HOUR: <%= @training.hour %> 
     </h1> 
    </section> 
    <section> 
     <h1> 
SLOTS: <%= @training.slots %> 
     </h1> 
    </section> 
    <center> 
    <%= render 'bookings/booking_form' if logged_in? %> 
    <%= render 'bookings/show_bookings' if logged_in? %> 
    </center> 

的booking_form：

<% unless current_user?(@user) %> 
     <% if current_user.bookings(@training) %> 
     <%= link_to "Book", new_training_booking_path(@training), class: "btn btn-primary" %> 

耙路线的输出指令：

    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 
        book GET /book(.:format)          bookings#new 
         POST /book(.:format)          bookings#create 
       unbook DELETE /unbook(.:format)         bookings#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 
     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 
        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 

Answer 1

NoMethodError in Bookings#new Showing /home/cesar/Apps/boxApp/app/views/bookings/new.html.erb where line #6 raised:

undefined method `bookings_path' for <#:0x0055c4717cc4d8> Did you mean? book_path

你有<%= form_for ([@training, @booking]) do |f| %>在new.html.erb，但是@training是不可用对于new方法。 ，因为您已经设置了before_action仅用于创建方法。

更改

before_action :load_training, only: [:create] 

到

before_action :load_training, only: [:new,:create] 

应该修正这个错误。

更改您的new方法如下面要修正这个错误

def new 
    @booking = Booking.new 
    @training = Training.find(params[:training_id]) 
    @booking.training_id 
end