Ruby ||路由錯誤

Question

我的路由問題與我的應用程序。

當我甚至嘗試查看的頁面，我得到以下錯誤

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

問題的原因是缺少所需的關鍵。我不知道缺少的鑰匙是什麼，我怎麼能找到它。

我相信表單的設置方式有問題，但我不知道是什麼。

有人可以告訴我，路由問題的原因是什麼？甚至可能告訴我如何解決它？

的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

你雖然@conferences重複這樣

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

因此在每次迭代有一個局部變量conference，而不是實例變量@conference。只需將按鈕部分更改爲：

<% 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 %>