ActionView :: Template :: Error（没有路线匹配{：action =>“ destroy”，：id => nil}，不匹配的约束条件：[：id]）：

Question

我在活动显示页面上添加了“兴趣”按钮，该页面具有两个视图：显示为1）如果用户在兴趣列表中没有该事件，则为“兴趣”2）如果用户已将事件添加到兴趣列表，则“删除兴趣”

但是，添加到关注列表的事件显示页面出错。 “删除兴趣”按钮/链接会导致以下错误。

这是错误消息

ActionView :: Template :: Error（没有路由匹配{：action =>“ destroy”，：controller =>“兴趣”，：id => nil}，可能是无法匹配的约束：[：id]）：

从我检查的结果中可能会发生，因为兴趣的ID没有传递到interest_path，尽管我已经在其中了...

视图

    <div class="int-btn">
      <% if user_signed_in? && current_user.interested_events.include?(@event) %>
        <%= link_to interest_path(@interest), method: :delete, data: { confirm: "You have removed this event from your interest list" } do %>
          <div class = "btn btn-main m-2">Remove Interest</div>
        <% end %>
      <% else %>
        <%= link_to event_interests_path(@event), method: :post, data: { confirm: "You have add this event in your interest list" } do %>
          <div class = "btn btn-main m-2">Interested</div>
        <% end %>
      <% end %>
    </div>

架构

  create_table "interests", force: :cascade do |t|
    t.bigint "user_id"
    t.bigint "event_id"
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
    t.index ["event_id"], name: "index_interests_on_event_id"
    t.index ["user_id"], name: "index_interests_on_user_id"
  end

路线

Rails.application.routes.draw do
  devise_for :users, controllers: { registrations: 'users/registrations' }
  root to: 'pages#home'

  resources :events do
    resources :interests, only:[:create]
    resources :reviews, only:[:create]
  end

  resources :plans, except:[:destroy] do
    resources :event_plans, only:[:create]
  end

  resources :reviews, only:[:destroy]
  resources :interests, only:[:destroy]

  get 'events/tagged', to: "events#tagged", as: :tagged
end

控制器

class InterestsController < ApplicationController
  def create
    @event = Event.find(params[:event_id])
    @interest = Interest.new(interest_params)
    @interest.user = current_user
    @interest.event = @event
    authorize @interest
    if @interest.save
      redirect_to event_path(@event)
    else
      render 'events/show', event: @event
    end
  end

  def destroy
    @interest = Interest.find(params[:id])
    authorize @interest
    # @event.user = current_user
    @event = @interest.event
    @interest.destroy
    redirect_to event_path(@event)
  end

  private

  def interest_params
    params.require(:interest).permit(:user_id, :event_id)
  end
end

型号

class Interest < ApplicationRecord
  belongs_to :user
  belongs_to :event
end

[如果您有任何其他问题或需要更多信息，请告诉我。

感谢您的所有帮助！

Answer 1

class EventsController < ApplicationController
  def show
    # other code here
    @event = Event.find(params[:id])
    @interest = Interest.find_by(user: current_user, event: @event)
  end
end

如果未登录的用户也可以访问此页面，它将为您提供有关当前用户的错误，要迅速解决，您可以将其调整为：

class EventsController < ApplicationController
  def show
    # other code here
    @event = Event.find(params[:id])
    if user_signed_in?
      @interest = Interest.find_by(user: current_user, event: @event)
    end
  end
end