Question

我在rails 3.1 app中有两个模型：lease_booking和lease_log。 Lease_booking has_many lease_logs和lease_log belongs_to lease_booking。在routes.rb中，关联是：

resources :lease_bookings do
  resources :lease_logs
end

在lease_booking show.html.erb中，创建新租约日志的路径是：

<%= link_to "new Log", new_lease_booking_lease_log_path(@lease_booking) %>

lease_log控制器中的“新”代码是：

  def new
    @lease_log = LeaseBooking.find(params[:id]).lease_log.new()
  end

但是，点击“新建日志”后，lease_log控制器“new”出错：

Couldn't find LeaseBooking without an ID

租赁日志控制器似乎未正确识别租赁预订的ID（应为1）。

同一错误页面上的租约预订ID（1）是正确的：

Parameters:

{"lease_booking_id"=>"1"}

有没有办法解决它？感谢。

更新：这是佣金路线的输出

    lease_booking_lease_logs GET    /lease_bookings/:lease_booking_id/lease_logs(.:format)          {:action=>"index", :controller=>"lease_logs"}
                             POST   /lease_bookings/:lease_booking_id/lease_logs(.:format)          {:action=>"create", :controller=>"lease_logs"}
 new_lease_booking_lease_log GET    /lease_bookings/:lease_booking_id/lease_logs/new(.:format)      {:action=>"new", :controller=>"lease_logs"}
edit_lease_booking_lease_log GET    /lease_bookings/:lease_booking_id/lease_logs/:id/edit(.:format) {:action=>"edit", :controller=>"lease_logs"}
     lease_booking_lease_log GET    /lease_bookings/:lease_booking_id/lease_logs/:id(.:format)      {:action=>"show", :controller=>"lease_logs"}
                             PUT    /lease_bookings/:lease_booking_id/lease_logs/:id(.:format)      {:action=>"update", :controller=>"lease_logs"}
                             DELETE /lease_bookings/:lease_booking_id/lease_logs/:id(.:format)      {:action=>"destroy", :controller=>"lease_logs"}

Answer 1

您的参数输出显示了您应该寻找的shat参数 - lease_booking_id：

@lease_log = LeaseBooking.find(params[:lease_booking_id]).lease_log.new()

在控制台中，运行rake routes以查看嵌套路由如何使用参数。

编辑：

当您嵌套路线时，内部资源取决于外部资源：

resources :lease_bookings do
  resources :lease_logs
end

查看用于创建lease_log的rake routes输出：

POST   /lease_bookings/:lease_booking_id/lease_logs

因此，当您设置表单时，您需要指定lease_booking以及新的lease_log（并且需要相应地调整任何_path或_url方法）：

<%= simple_form_for [@lease_booking, @lease_log] do |f| %>

这还需要您在控制器中设置@lease_booking：

有关Rails路由的详细信息，请参阅http://guides.rubyonrails.org/routing.html。

def new
  @lease_booking = LeaseBooking.find(params[:lease_booking_id])
  @lease_log = @lease_booking.lease_log.new
end

Answer 2

这是我发现构建一对多关联的控制器和视图的完美示例：

http://jonathanhui.com/ruby-rails-3-model-1-many-association

如何在rails 3.1中的相关控制器中构造“new”

2 个答案: