Question

我的观点中的链接出现此错误

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

我在这里使用此方法为用户分配购物车

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

这是我的推车控制器

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{：action =＆gt;”show“，：controller =＆gt;”carts“，：id =＆gt; nil}缺少必需的密钥：[：id]”当用户上升时“登录他们的帐户。我想要的是用户在登录时（在布局视图内）拥有“查看购物车链接”，以便他们可以在任何地方查看他们的购物车。但是，一旦他们登录，这个错误就会引发。对此有任何帮助表示赞赏，我很乐意提供更多信息。

Answer 1

尝试切换

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

与

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

如果未找到记录，

find_by将返回nil。 find_by!引发ActiveRecord::RecordNotFound错误。

有关详细信息，请参阅ActiveRecord::FinderMethods。

Rails没有路由匹配缺少必需的键：[：id]

1 个答案: