Question

我正在制作一个用户可以预订一小时培训的应用程序。我想给应用程序一个限制，当用户已经预订了一小时的培训时，它无法预订更多的培训，至少他会删除它或书籍到期。

我的代码是：

预订控制器：

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

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

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

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


  def index
    @bookings = Booking.where(training_id: params[:training_id])
  end


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



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

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

end

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

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

培训观点索引：

<h1>Hours</h1>

<ul class="trainings">
  <% @trainings.each do |training| %>
  <li>
    <%= link_to training.hour, training_path(training) %>
  </li>
  <% end %>
</ul>

展示培训观点：

<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/index_bookings' if logged_in? %>
  </center>

Booking_form.html.erb查看：

<% unless current_user?(@user) %>
      <% if current_user.is_booked(@training) %>
      <%= link_to "Delete book", training_booking_path(@training), method: "delete", data: { confirm: 'Are you certain you want to delete this?' }, class: "btn btn-primary" %>
      <% else %>
      <%= link_to "Book", new_training_booking_path(@training), class: "btn btn-primary" %>
    <% end %>
<% end %>

我收到以下错误：

BookingsController＃destroy中的ActiveRecord :: RecordNotFound

找不到'id'= 1
的预订
参数：

{ “_方法”=＆gt; “中删除”，   “authenticity_token”=＆gt; “中0uUXRwZdbhaKl16QxDi1HCM4H8IwEvGuoFOoxmkHhowoAUgZnlWPybck9DEbCKHh42SqXs3vtc01IRTqbx05wA ==”，   “training_id”=＆gt;“1”，“id”=＆gt;“1”}

我想知道为什么该方法没有得到booking_id

当我试着看训练时间时：

Started GET "/trainings/1" for 127.0.0.1 at 2017-03-11 01:03:23 -0400
Processing by TrainingsController#show as HTML
  Parameters: {"id"=>"1"}
  Training Load (0.1ms)  SELECT  "trainings".* FROM "trainings" WHERE "trainings"."id" = ? LIMIT ?  [["id", 1], ["LIMIT", 1]]
  Rendering trainings/show.html.erb within layouts/application
  User Load (0.1ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = ? LIMIT ?  [["id", 1], ["LIMIT", 1]]
  Rendered bookings/_booking_form.html.erb (2.3ms)
  Rendered trainings/show.html.erb within layouts/application (4.0ms)
Completed 500 Internal Server Error in 6ms (ActiveRecord: 0.2ms)



ActionView::Template::Error (No route matches {:action=>"show", :controller=>"bookings", :id=>nil, :training_id=>"1"} missing required keys: [:id]):
    2:       <% if current_user.not_booked(@training) %>
    3:       <%= link_to "Reservar", new_training_booking_path(@training), class: "btn btn-primary" %>
    4:       <% else %>
    5:       <%= link_to "Eliminar reserva", training_booking_path(@training, @booking), method: :delete,
    6:        data: { confirm: 'Are you certain you want to delete this?' }, class: "btn btn-primary" %>
    7:     <% end %>
    8: <% end %>

培训模式：

class Training < ApplicationRecord
  has_many :users, through: :bookings
  has_many :bookings

  def can_book?
    bookings.count < cantidad
  end

  end

训练控制员：

class TrainingsController＆lt; ApplicationController中

 def show
    @training = Training.find(params[:id])
  end

  def index
    @trainings = Training.all
  end
end

由于

Answer 1

在这一行：

<%= link_to "Delete book", training_booking_path(@training), method: "delete", data: { confirm: 'Are you certain you want to delete this?' }, class: "btn btn-primary" %>

我认为路径training_booking_path(@training)也应包含@booking实例变量，因为嵌套路由。

所以它应该是training_booking_path(@training, @booking), method: :delete等等。

您必须在视图中显示@booking表单

我会在你的控制台中使用rake routes来确认正确的路径以及需要传递哪些资源ID

编辑：

您的培训控制器显示操作需要将预订作为实例变量提供：

def show
  @training = Training.find(params[:id])
  @bookings = @training.bookings
end

然后在您的培训节目视图中，表单所在的位置，您需要遍历@bookings并为每个链接包含一个单独的删除链接：

<% @bookings.each do |booking| %>
  <%= link_to "Delete book", training_booking_path(booking.training, booking), method: :delete, data: { confirm: 'Are you certain you want to delete this?' }, class: "btn btn-primary" %>
<% end %>

让用户只需预订一次培训即可

1 个答案: