Question

我试图实施添加到收藏夹并且我收到此错误：

<%= link_to "Favorite Items", favorites_path, method: :get, :class => 'navbar-link'  %>

这是错误弹出的地方，位于以下链接：

class Favorite < ApplicationRecord
  belongs_to :viewer
  belongs_to :favorited, polymorphic: true
end

class Viewer < ApplicationRecord
devise :database_authenticatable, :registerable,
 :recoverable, :rememberable, :trackable, :validatable

has_many :favorites
has_many :favorite_items, through: :favorites, source: :favorited, source_type: 'Item'
end

模型关联

get '/favorites', to: 'favorite_items#index', as: 'favorites'
resources :favorite_items, only: [:create, :destroy]

路线：

add

以及我的展示页面上的remove或<%- unless current_shopper.favorite_items.exists?(id: @item.id) -%> <%= link_to 'Add to favorites', favorite_items_path(item_id: @item), method: :post %> <%- else -%> <%= link_to 'Remove from favorites', favorite_item_path(@item), method: :delete %> <%- end -%>收藏夹链接：

class FavoriteItemsController < ApplicationController
before_action :set_item

  def index
   @favorites = current_viewer.favorites
  end

  def create
    if Favorite.create(favorited: @item, viewer: current_viewer)
      redirect_to @item, notice: 'Item has been favorited'
    else
      redirect_to @item, alert: 'Something went wrong...*sad panda*'
    end
  end

  def destroy
    Favorite.where(favorited_id: @item.id, viewer_id: current_viewer.id).first.destroy
    redirect_to @item, notice: 'Item is no longer in favorites'
  end

  private

  def set_item
    @item = Item.find(params[:item_id] || params[:id])
  end

控制器

 <% @favorites.each do |item| %>
    <tr>
     <td><%= item.title %></td>
     <td><%= item.price %></td>
     <td><%= link_to 'Remove from favorites', favorite_items_path(@item.id), method: :delete %></td>
  <  /tr>
 <% end %>

和循环通过喜欢的项目的索引，虽然不确定这是否正确，因为错误在循环之前停止：

Item Exists (4.3ms)  SELECT  1 AS one FROM "items" INNER JOIN "favorites" 
ON "items"."id" = "favorites"."favorited_id" WHERE "favorites"."viewer_id"
 = $1 AND "favorites"."favorited_type" = $2 AND "items"."id" = $3 LIMIT $4 
 [["viewer_id", 2], ["favorited_type", "Item"], ["id", 4], ["LIMIT", 1]]

更新1

这是我点击添加到收藏夹

时得到的

def create
    @item = Item.new(item_params)

    respond_to do |format|
      if @item.save
        format.html { redirect_to @item, notice: 'Item was successfully created.' }
        format.json { render :show, status: :created, location: @item }
      else
        format.html { render :new }
        format.json { render json: @item.errors, status: :unprocessable_entity }
      end
    end
  end


def show
  @comments = Comment.where(item_id: @item).order("created_at DESC")
  @items = Item.find(params[:id]) 
end

items_controller.rb

function myDelete()
{
  var ss = SpreadsheetApp.openById('***');
  var allshts=ss.getSheets();
  var sh=allshts[0];
  var rg=sh.getDataRange();
  var vA=rg.getValues();
  for(var i=vA.length-1;i>=0;i--) 
  {
    if(vA[i][8]==0 && vA[i][9]==0 && vA[i][10]==0 && vA[i][11]==0 && vA[i][12]==0 && vA[i][13]==0 && vA[i][14]==0 && vA[i][15]==0 && vA[i][16]==0 && vA[i][17]==0 && vA[i][18]==0 && vA[i][19]==0)
    {
      sh.deleteRow(i+1);
    }
  } 
}

Answer 1

class FavoriteItemsController < ApplicationController
  before_action :set_item, only: [:create, :destroy]
  ..
  ..
end

索引HTML

＆lt;％= link_to＆＃39;从收藏夹＆＃39;中删除， favorite_items_path（@ item.id），方法:: delete％＆gt;

替换为

＆lt;％= link_to＆＃39;从收藏夹＆＃39;，favorite_item_path（item.id）中删除，方法::删除％＆gt;

Answer 2

尝试用{/ 1>替换FavoriteItemsController

before_action :set_item, :only => [:create, :destroy]

Rails：无法找到带有＆＃39; id＆＃39; =的项目

2 个答案: