Question

用户＆＃34;管理员＆＃34;创建活动。因此，每个事件都有自己的URL，例如＆＃34; events / 1＆＃34;。在公共站点上（即，不需要身份验证）。公众可以购买活动门票。管理员所要做的就是发布公共网址，即＆＃34; event / 1＆＃34;并为票务买家提供表格填写

我无法让ticket_buyers与他们各自的活动（即活动/ 1）相关联。以下是在命令提示符下运行Event.first.ticket_buyers的结果，该命令提示符在数组中没有显示任何内容，即使我使用应用程序表单（而不是命令api）使用ticket_buyer数据填充了第一个事件：

irb(main):001:0> Event.first.ticket_buyers
  Event Load (0.0ms)  SELECT  "events".* FROM "events"  ORDER BY "events"."id" ASC LIMIT 1
  TicketBuyer Load (1.0ms)  SELECT "ticket_buyers".* FROM "ticket_buyers" WHERE "ticket_buyers"."event_id" = ?  [["event_id", 1]]
=> #<ActiveRecord::Associations::CollectionProxy []>

活动模式

class Event < ActiveRecord::Base
  belongs_to :admin
  has_many :ticket_buyers, dependent: :destroy
end

TicketBuyer模型

class TicketBuyer < ActiveRecord::Base
  belongs_to :event
end

事件控制器

class EventsController < ApplicationController
  before_filter :authenticate_admin!, :except => :show

  def index 
    @events = current_admin.events
  end

  def show     
    @event = Event.find(params[:id])
    @ticket_buyers = TicketBuyer.new
  end

  def new 
    @event = current_admin.events.build
    @event.admin = current_admin
  end

  def create
    @event = current_admin.events.build(event_params)

    if @event.save
      redirect_to @event
    else
      render 'new'
    end
  end

  private

  def event_params
      params.require(:event).permit(:name_of_event, ticket_buyer_attributes:  [:full_name,  :number_of_tickets])
  end
end

门票买家控制器

class TicketBuyersController < ApplicationController
  before_action :authenticate_admin!, :except => [:new, :create]

  def index
    @ticket_buyer = TicketBuyer.all
  end

  def show    
    @ticket_buyer = TicketBuyer.find(params[:id])
    @event = Event.find(params[:event_id])
  end

  def new
    @ticket_buyer = TicketBuyer.new
  end

  def create  
    @ticket_buyer = TicketBuyer.new(ticket_buyer_params)
    if @ticket_buyer.save
      redirect_to localhost:3000
    else
      render('new')
    end
  end

  private

  def set_ticket_buyer
    @ticket_buyer = Ticket_buyer.find(params[:id])
  end

  def ticket_buyer_params
    params.require(:ticket_buyer).permit(:full_name,  :number_of_tickets)
  end
end

数据库架构

ActiveRecord::Schema.define(version: 20160705212350) do

  create_table "admins", force: :cascade do |t|
    t.string   "email",                  default: "", null: false
    t.string   "encrypted_password",     default: "", null: false
    t.string   "reset_password_token"
    t.datetime "reset_password_sent_at"
    t.datetime "remember_created_at"
    t.integer  "sign_in_count",          default: 0,  null: false
    t.datetime "current_sign_in_at"
    t.datetime "last_sign_in_at"
    t.string   "current_sign_in_ip"
    t.string   "last_sign_in_ip"
    t.datetime "created_at",                          null: false
    t.datetime "updated_at",                          null: false
    t.string   "full_name"
   end

  add_index "admins", ["email"], name: "index_admins_on_email", unique: true
  add_index "admins", ["reset_password_token"], name: "index_admins_on_reset_password_token", unique: true

  create_table "events", force: :cascade do |t|
    t.text     "name_of_event"
    t.integer  "admin_id"
    t.datetime "created_at",           null: false
    t.datetime "updated_at",           null: false
  end

  add_index "events", ["admin_id"], name: "index_events_on_admin_id"

  create_table "ticket_buyers", force: :cascade do |t|
    t.text     "full_name"
    t.integer  "event_id"
    t.datetime "created_at",          null: false
    t.datetime "updated_at",          null: false
  end

  add_index "ticket_buyers", ["event_id"], name: "index_ticket_buyers_on_event_id"
end

的routes.rb

Rails.application.routes.draw do
  devise_for :admins
    resources :events do
      resources :ticket_buyers do
  end
end

ticket_buyers / index.html.erb

<p id="notice"><%= notice %></p>

  <table class='table table-striped table-hover'>
    <thead>
      <tr>
        <th>Name</th>
        <th>Number of tickets</th>
        <th colspan="4"></th>
      </tr>
    </thead>

    <tbody>
      <% @ticket_buyer.each do |ticket_buyer| %>
      <tr class="<%= cycle('list_line_odd', 'list_line_even') %>">
        <tr>
          <td><%= link_to ticket_buyer.full_name %></td>
          <td><%= link_to ticket_buyer.number_of_tickets %></td>        
        </tr>
     <% end %>
  </tbody>
  </table>
<%= link_to 'Back', events_path %>

Answer 1

在TicketBuyer创建操作中，您需要在创建事件后将记录与事件相关联：

class TicketBuyersController < ApplicationController
  before_action :authenticate_admin!, :except => [:new, :create]

  def create  
    @ticket_buyer = TicketBuyer.new(ticket_buyer_params)

    if @ticket_buyer.save
      # This line below links it to your event
      Event.find(params[:event_id]).ticket_buyers << @ticket_buyer
      redirect_to localhost:3000
    else
      render('new')
    end  
  end

您还可以使用事件本身创建ticket_buyer，如下所示：

def create  
  @ticket_buyer = Event.find(params[:event_id]).ticket_buyers.new(ticket_buyer_params)

  if @ticket_buyer.save
    redirect_to localhost:3000
  else
    render('new')
  end

这将在构建模型时自动将正确的event_id添加到模型中。另外，请确保已运行将event_id列添加到ticket_buyers表的迁移。

更新：

要在索引操作中显示正确的ticket_buyers，您需要加载该事件，然后使用您可以循环关闭该事件的ticket_buyers：

TicketBuyersController：

def index
  @event = Event.find(params[:event_id])
end

索引视图：

<tbody>
  <% @event.ticket_buyers.each do |ticket_buyer| %>
  <tr class="<%= cycle('list_line_odd', 'list_line_even') %>">
    <tr>
      <td><%= link_to ticket_buyer.full_name %></td>
      <td><%= link_to ticket_buyer.number_of_tickets %></td>        
    </tr>
 <% end %>

Answer 2

这是因为您没有在ticket_buyer记录中保存事件ID。我想知道为什么你也没有验证ticket_buyers的存在。立即快速解决方法是将您的event_id添加到ticket_buyer_params，如下所示：

def ticket_buyer_params  
  params.require(:ticket_buyer).permit(:full_name, :number_of_tickets, :event_id)
end

无法获得工作关联

2 个答案: