Ruby on rails 为属于不同模型的模型创建独立表单？

所以我有两种型号的

房间

和

预订

Room

对象是由拥有该房间的人预先创建的，并存储在数据库中

我想允许不同的用户稍后创建属于该特定房间的预订（在不同的页面和完全不同的表单上），这样当我想为该房间列出预订列表时，我只需执行类似于

@room.reservations

的操作

我希望在

RoomsController

中创建房间，并在

ReservationsController

中创建预订

class ReservationsController < ApplicationController
    # What I want to do:
    @listing = Listing.new(params[:id])   # no way of getting Listing's id
    @reservation = @listing.reservations.build(reservation_params)

    # etc...

不幸的是，我似乎不知道如何用“Rails方式”来实现这一点。我想到的最好的办法是：

# .../rooms/new
= form_for @room, room_path do |f|
    # Form that creates a room

# .../reservations/new
= form_for @reservation, reservation_path do |f|
    # Form that creates a reservation

但是当我这样做时，我没有办法（至少我知道）引用

ReservationsController

中的特定的列表

class ReservationsController < ApplicationController
    # What I want to do:
    @listing = Listing.new(params[:id])   # no way of getting Listing's id
    @reservation = @listing.reservations.build(reservation_params)

    # etc...

这根本不是我想要的。我希望能够使用我的

预订控制器

class ReservationsController < ApplicationController
    # What I want to do:
    @listing = Listing.new(params[:id])   # no way of getting Listing's id
    @reservation = @listing.reservations.build(reservation_params)

    # etc...

如何实现这一点？

使用嵌套路由：

resources :rooms, shallow: true do
  resources :reservations
end

这嵌套了房间上下文中预订的“收集路线”

              Prefix Verb   URI Pattern                                Controller#Action
   room_reservations GET    /rooms/:room_id/reservations(.:format)     reservations#index
                     POST   /rooms/:room_id/reservations(.:format)     reservations#create
new_room_reservation GET    /rooms/:room_id/reservations/new(.:format) reservations#new
    edit_reservation GET    /reservations/:id/edit(.:format)           reservations#edit
         reservation GET    /reservations/:id(.:format)                reservations#show
                     PATCH  /reservations/:id(.:format)                reservations#update
                     PUT    /reservations/:id(.:format)                reservations#update
                     DELETE /reservations/:id(.:format)                reservations#destroy
               rooms GET    /rooms(.:format)                           rooms#index
                     POST   /rooms(.:format)                           rooms#create
            new_room GET    /rooms/new(.:format)                       rooms#new
           edit_room GET    /rooms/:id/edit(.:format)                  rooms#edit
                room GET    /rooms/:id(.:format)                       rooms#show
                     PATCH  /rooms/:id(.:format)                       rooms#update
                     PUT    /rooms/:id(.:format)                       rooms#update
                     DELETE /rooms/:id(.:format)                       rooms#destroy

然后，您需要更改ReservationsController，以便在创建预订时使用

参数[：room\u id]

查找房间：

class ReservationsController < ApplicationController
  before_action :set_reservation, only: [:show, :edit, :update, :destroy]
  before_action :set_room, only: [:new, :create]

  # GET /rooms/:room_id/reservations
  def index
    @room = Room.includes(:reservations).find(params[:room_id])
    @reservations = @room.reservations.all
  end

  # GET /rooms/:room_id/reservations/new
  def new
    @reservation = @room.reservations.new
  end

  # POST /rooms/:room_id/reservations
  def create
    @reservation = @room.reservations.new(reservation_params)

    if @reservation.save
      redirect_to @reservation, notice: 'Reservation was successfully created.'
    else
      render :new
    end
  end

  # ... The rest of the controller actions

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_reservation
      @reservation = Reservation.find(params[:id])
    end

    def set_room
      @room.find(params[:room_id])
    end

    # Only allow a trusted parameter "white list" through.
    def reservation_params
      params.require(:reservation).permit(:room_id, :starts_at, :ends_at)
    end
end

---

没有必要在表单中包含房间id，因为我们是从请求url获取的。

注意，我使用的是

room

，因为您不太清楚

列表

在应用程序中的含义。尽管如此，同样的原则仍然适用。哦，对不起，我的意思是“房间”而不是“挂牌”！我将尝试一下，看看它对我的效果如何，但只要看看它，我就知道这可能是我的正确答案。这是我用来生成答案代码的演示Rails应用程序：