Ruby \x\x路由错误

Question

我的应用程序有路由问题。

甚至当我试图查看页面时，我会得到以下错误

ActionController::UrlGenerationError in Conferences#index
No route matches {:action=>"create", :conference_id=>nil, :controller=>"subscriptions", :format=>nil} missing required keys: [:conference_id]

造成问题的原因是缺少所需的密钥。我不知道丢失的钥匙是什么，也不知道怎么找到它。

我相信表单的设置方式有问题，但我不知道是什么。

有人能告诉我，路由问题的原因是什么吗？甚至告诉我怎么解决这个问题？

Routes.rb

  resources :conferences, shallow: true do
    resources :subscriptions, only: [:create, :destroy]
  end

Index.html.erb

  <% @conferences.each do |conference| %>
  <div class="box">
    <%= image_tag conference.picture.url, :class => "background"  if conference.picture?%>
    <div class="text-box">
      <p>CONFERENCE:<%= conference.conference %>
      </p>
      <p>COUNTRY:<%= conference.country %>
      </p>
      <p>MONTH:<%= conference.month %>
      </p>
      <p>PRESENCE:<%= conference.presence %>
      </p>
      <p>AUDIENCE:<%= conference.audience %>
      </p>
      <p>COST:<%= conference.cost %>
      </p>
      <p>Attending:
      </p>
    </div>
  </div>
  <% if current_user.subscribed_to?(@conference) %>
  <%= button_to "Unsubscribe", subscription_path(current_user.find_subscription(@conference)), method: :delete %>

<% else %>
  <%= button_to "Subscribe", conference_subscriptions_path(@conference, @subscription), method: :post %>
<% end %>

  <% end %>

ConferenceController

   def index
      @conferences = Conference.paginate(page: params[:page])


      if params[:search]
        @conferences = Conference.search(params[:search]).order("created_at DESC").paginate(page: params[:page])
      else
        @conferences = Conference.all.order('created_at DESC').paginate(page: params[:page])
      end
    end

SubscriptionController

class SubscriptionsController < ApplicationController
    before_action :set_conference, only: :create

  def create
    if current_user.subsciptions.create(conference: @conference)
      flash[:success] = "You are now subscribed to { @conference.name }"
    else
      flash[:error] = "Could not create subscription."
    end
    redirect_to @conference
  end

  def destroy
    @subscription = current_user.subsciptions.find(params[:id])
    if @subscription.destroy
      flash[:success] = "You are no longer subscribed to { @conference.name }"
    else
      flash[:error] = "Oh noes"
    end

    redirect_to @subscription.conference
  end

  def set_conference
    @conference = Conference.find(:params[conference_id])
  end
end

Answer 1

您可以像这样迭代@conferences

<% @conferences.each do |conference| %>

因此，在每次迭代中都有一个局部变量conference，但没有实例变量@conference。只需将按钮部分更改为：

<% if current_user.subscribed_to?(conference) %>
  <%= button_to "Unsubscribe", 
                subscription_path(current_user.find_subscription(conference)), 
                method: :delete %>
<% else %>
  <%= button_to "Subscribe", 
                conference_subscriptions_path(conference), 
                method: :post %>
<% end %>