未定義的方法`voted_on？'爲零：使用thumbs_up的NilClass錯誤消息

Question

我目前正在嘗試使用thumbs_up實現喜歡和unlikes rails應用程序。我按照此頁上的說明操作：Clarification on how to use "thumbs_up" voting gem with Rails 3

用戶可以喜歡和不同的書。我有兩個按鈕，喜歡和不同，我想隱藏用戶的一個或另一個，取決於用戶目前的狀態。所以我想，如果一個人會是適當的這樣的：

<% if @user.voted_on?(@book) %>  
    <div class="unlike_button"><%= link_to("Unlike", unvote_book_path(book), method: :post) %></div> 
<% else %> 
    <div class="like_button"><%= link_to("Like", vote_up_book_path(book), method: :post) %></div> 
<% end %> 

，在我route.rb文件：

resources :books do 
    member do 
    post :vote_up 
    post :unvote 
    end 
end 

但是當我運行此我得到的錯誤信息：

未定義的方法`voted_on？'對於零：NilClass

有什麼我可能會做錯嗎？

更新

由於米沙的建議，我把它改爲current_user.voted_on。現在，我得到這個錯誤信息：

Called id for nil, which would mistakenly be 4 -- if you really wanted the id of nil, use object_id 

下面是我的書控制器的片段

include UsersHelper 
include SessionsHelper 


    before_filter :signed_in_user, only: [:index] 
    before_filter :admin_user, only: :destroy 

    def index 
    array = Book.search(params[:search]) 
    @books = Kaminari.paginate_array(array).page(params[:page]).per(5) 

    end 

    def show 
    @book = Book.find(params[:id]) 
    #respond_to do |format| 
    #format.js 
    #end 
    end 


    def destroy 
    Book.find(params[:id]).destroy 
    flash[:success] = "Book deleted." 
    redirect_to books_url 
    end 

    def vote_up 
    begin 
     current_user.vote_for(@book = Book.find(params[:id])) 
     flash[:success] = "Liked!." 
     redirect_to books_url 
    end 
    end 

    def unvote 
    begin 
     current_user.unvote_for(@book = Book.find(params[:id])) 
     flash[:success] = "Unliked!." 
     redirect_to books_url 
    end 
    end 

Answer 1

您應該更改您的聯繫方式從後到把和 更改路線.rb至

resources :books 

您還可以通過使用此代碼更新使用鏈路上的數據：

<%= link_to "Like", book, :method => :put %> 
or 
<%= link_to "Unlike", book, :method => :put %> 

和這正好與你的控制器 假設你在發表你的模型有is_liked布爾場

def update 
@post = Post.find(params[:id]) 

    if @post.is_liked? 
     @post.attributes = { 
     :is_liked => "f" 
    } 
    redirect_to posts_path, :flash => "Unliked" 
    else 
    @post.attributes = { 
     :is_liked => "t" 
     } 
    redirect_to posts_path, :flash => "Liked" 
    end 

end