2016-03-28 92 views
1

我有这样的错误与我的链接在我的意见Rails的无路由匹配缺少必需的键:[:ID]

HTML

<% if logged_in? %> 
<%=link_to "View Your Cart", cart_path(@cart)%> 
<% end %> 

我的路线

resources :users 
    resources :parts 
    resources :carts 
    resources :categories 
    resources :line_items 

我有这个方法在这里为用户指定购物车

def set_cart 
    @cart = Cart.find_by(id: session[:cart_id], user: session[:user_id]) 
    rescue ActiveRecord::RecordNotFound 
    @cart = Cart.create 
    session[:cart_id] = @cart.id 
    end 

这是我的会话控制器

def new 
    @user = User.new 
    end 

    def create 
    if params[:provider] == "facebook" 
     user = User.from_omniauth(env["omniauth.auth"]) 
     session[:user_id] = user.id 
     redirect_to root_path 
    else 
     @user = User.find_by(email: params[:user][:email]) 
     @user = User.new if @user.blank? 
    if @user && @user.authenticate(params[:user][:password]) 
     session[:user_id] = @user.id 
     @cart = Cart.create 
     @user.cart = @cart.id 
     @user.save 
      redirect_to @user 
     else 
     flash[:notice] = "Failed to login, please try again" 
     render 'new' 
     end 
    end 
    end 

    def destroy 
    session[:user_id] = nil 
    redirect_to root_url 
    end 
end 

这是我的车控制器

class CartsController < ApplicationController 
    before_action :set_cart, only: [:show, :edit, :update, :destroy] 
    rescue_from ActiveRecord::RecordNotFound, with: :invalid_cart 

    def show 
    @cart = Cart.find(params[:id]) 
    end 

    def edit 
    @cart = Cart.new(cart_params) 
    end 

    def update 
    @cart = Cart.find(params[:id]) 
     if @cart.update_attributes(cart_params) 
     redirect_to @cart 
     end 
    end 

    def destroy 
    @cart.destroy if @cart.id == session[:cart_id] 
    session[:cart_id] = nil 
    respond_to do |format| 
     format.html { redirect_to root_path } 
     format.json { head :no_content } 
    end 
end 

    private 
    def cart_params 
    params.require(:cart).permit(:user_id) 
    end 

    def invalid_cart 
    logger.error "Attempt to access invalid cart #{params[:id]}" 
    redirect_to root_path, notice: "Invalid cart" 
    end 
end 

以下错误 “无路由匹配{:动作=>” 秀”,:控制器=> “大车”, :id => nil}缺少必需的键:[:id]“在用户登录其帐户时上升。我想要的是,用户在登录时(在布局视图中)有一个“查看您的购物车链接”,以便他们可以在任何地方查看购物车。然而,一旦他们登录,这个错误就会升起。任何帮助这个人都会很感激,我很乐意提供更多的信息。

+0

尝试'redirect_to user_path(@user)' –

+0

为link_to“查看您的购物车”??? – Dan

回答

1

尝试切换

Cart.find_by(id: session[:cart_id], user: session[:user_id])

Cart.find_by!(id: session[:cart_id], user: session[:user_id])

find_by回报nil如果没有记录被发现。 find_by!抛出ActiveRecord::RecordNotFound错误。

有关更多信息,请参阅ActiveRecord::FinderMethods

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