的Rails：NoMethodError在上述ItemsController＃顯示

從我ItemsController訪問@favorites = current_viewer.favorites_items.where(item_id: @item.id)當我收到一個錯誤：的Rails：NoMethodError在上述ItemsController＃顯示

NoMethodError in ItemsController#show 
undefined method `favorites_items' for nil:NilClass

items_controller.rb

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

型號協會：

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

    has_many :comments, dependent: :destroy 
    has_many :favorites 
has_many :favorite_items, through: :favorites, source: :favorited, source_type: 'Item' 

end 

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

class Item < ApplicationRecord 
    belongs_to :seller 
    belongs_to :category 
    has_many :comments, dependent: :destroy 

    mount_uploaders :attachments, ImageUploader 
end

路線.rb

devise_for :viewers, controllers: {registrations: 'viewers/registrations', sessions: 'viewers/sessions'} 
    devise_scope :viewer do 
    get "viewers/index"=> "viewers/sessions#index", :as => "viewer_index" 
    end 

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

更新1

我byebug輸入下一三次：

40: 
41: # GET /items/1 
42: # GET /items/1.json 
43: def show 
44:  byebug 
=> 45:  @favorites = current_viewer.favorites_items.where(item_id: @item.id) 
46:  @comments = Comment.where(item_id: @item).order("created_at DESC") 
(byebug) 

in /.rvm/gems/ruby-2.4.0/gems/actionpack-5.1.4/lib/action_controller/metal/rescue.rb 
17: 
18:  private 
19:  def process_action(*args) 
20:   super 
21:  rescue Exception => exception 
=> 22:   request.env["action_dispatch.show_detailed_exceptions"] ||= show_detailed_exceptions? 
23:   rescue_with_handler(exception) || raise 
24:  end 
25: end 
26: end 
(byebug) 

18:  private 
19:  def process_action(*args) 
20:   super 
21:  rescue Exception => exception 
22:   request.env["action_dispatch.show_detailed_exceptions"] ||= show_detailed_exceptions? 
=> 23:   rescue_with_handler(exception) || raise 
24:  end 
25: end 
26: end 
(byebug)

來源

2017-10-10 Theopap

您沒有定義'current_viewer'。 – coreyward

因爲你正在使用設計你應該使用current_viewer –

@ Gabriel Mesquita ...它只是一個錯字，現在我改了它 – Theopap

角色，您需要像這樣正確訪問您的幫手：

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

current_viewer幫助器爲零，因爲您是以賣家身份登錄的！

來源

2017-10-10 18:46:28

如果current_viewer出現一個錯誤提示this ...現在'elsif'行有錯誤：'undefined method'favorites_items'for＃我不得不擺脫''' ' – Theopap

@Theopap查看器有這個has_many：favorite_items，通過::收藏夾，來源:: favorited，source_type：'Item'，賣家也有嗎？ –

我也不得不將'favorites_items'改爲'favorite_items'，我得到這個：未定義的方法'favorite_items'爲零：NilClass ...嗯嗯很奇怪 – Theopap

你可能有你既然有不同類型的用戶的過濾器之前，設置驗證觀衆

class ItemsController < ActionController::Base 
    before_action :authenticate_viewer! 

    def show 
    ... 
    end 
end

來源

2017-10-10 18:30:55 Tachyons

的Rails：NoMethodError在上述ItemsController＃顯示

回答

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