如何从rails中的父索引页面访问子新表单？

Question

我正在尝试从驾驶室索引页面获取预订控制器的新表单。我怎么才能拿到它？如何从驾驶室索引页面访问新表格，其中我已经显示了所有添加的驾驶室..

驾驶室控制器

    class CabsController < ApplicationController


before_action :find_cab, only: [:show, :edit, :update, :destroy]

def index
    @cabs = Cab.all.order("created_at DESC")
end

def new
    @cab = Cab.new
end

def show
    @reviews = Review.where(cab_id: @cab.id).order("created_at DESC")

    if @reviews.blank?
      @avg_review=0
    else
      @avg_review=@reviews.average(:rating).round(2)
    end
end

def edit
end

def create
    @cab = Cab.new(cab_params)
    if @cab.save
        redirect_to @cab
    else
        render 'new' 
    end
end

def update
    if @cab.update(cab_params)
        redirect_to @cab
    else
        render 'edit'
    end
end

def destroy
    @cab.destroy

    redirect_to root_path
end

private

def find_cab
    @cab = Cab.find(params[:id])
end


def cab_params
    params.require(:cab).permit(:name, :number_plate, :seat, :image)
end 
end

预约控制器

    class BookingsController < ApplicationController

before_action :find_booking, only: [:show, :edit, :update, :destroy]
before_action :find_cab

def index
 @bookings = Booking.where(cab_id: @cab.id).order("created_at DESC")
end

def new
 @booking = Booking.new
end

def show
end

def edit
end

def create
  @booking = Booking.new(booking_params)
  @booking.user_id = current_user.id
  @booking.cab_id = @cab.id

  if @booking.save
   redirect_to cab_booking_path(@cab, @booking)
 else
   render 'new'
 end
end

def update
end

def destroy
end

private

def find_booking
  @booking = Booking.find(params[:id])
end

def find_cab
  @cab = Cab.find(params[:cab_id])
end

def booking_params
  params.require(:booking).permit(:date, :address, :start_destination, :destination, :start_date, :end_date, :contact_no)
end

end

路由

     resources :cabs  do
       resources :bookings
     end

驾驶室/ index.html.erb

    <div class="container">
<h2>All Cabs</h2>
<div class="row">


    <% @cabs.each do |cab| %>
        <div class="col-sm-6 col-md-3">
            <div class="thumbnail">
                <%= link_to image_tag(cab.image.url(:medium), class: 'image'), cab %><br>
                Cab Name : <h4><%= cab.name %></h4>
                <%= link_to "Book Now", new_cab_booking_path(@cab, @booking) %> # i wanted to create this link
            </div>
        </div>
    <% end %>
</div>
<%= link_to "Add Cab", new_cab_path, class: 'btn btn-default' %>

我得到的错误是

    No route matches {:action=>"new", :cab_id=>nil, :controller=>"bookings"} missing required keys: [:cab_id]

Answer 1

  

没有路线匹配{：action =＆gt;＆＃34; new＆＃34;，：cab_id =＆gt; nil，   ：controller =＆gt;＆＃34;预订＆＃34;}缺少必需的密钥：[：cab_id]

问题在于这一行

<%= link_to "Book Now", new_cab_booking_path(@cab, @booking) %>

应该是

<%= link_to "Book Now", new_cab_booking_path(cab) %>