缺少必需的键 [英] Missing required keys

问题描述

Rails 菜鸟在这里.尝试从导航栏中的图像链接到购物车显示页面.代码:

Rails rookie here. Attempting to link to a carts show page from an image in my navbar. the code:

<%= link_to(image_tag("cart.png"),cart_path) %> 

给我这个错误:

No route matches {:action=>"show", :controller=>"carts"} missing required keys: [:id]

我的购物车控制器从这个开始:

My carts controller starts with this:

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

您的向导的任何见解都会很棒.

Any insight from you wizards would be great.

推荐答案

既然你说你是菜鸟，那我就详细解释一下.本声明:

Since you say you're a rookie, I'll explain it in detail. This statement:

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

表示在数据库中查找并找到 ID 为 X 的购物车".但是，当您这样做时:

Means "look in the database and find the cart with an id of X". However, when you do:

<%= link_to(image_tag("cart.png"),cart_path) %> 

您没有提供该 ID.这就是为什么它会给你那个错误.

You aren't providing that id. That's why it gives you that error.

我不知道你的路线是如何定义的，但你可以这样做:

I don't know how your routes are defined, but you can do something like this:

<%= link_to(image_tag("cart.png"),cart_path(cart_id_here) %>

这是一种说法，ID 为 X 的购物车的路径".

Which is a way of saying, "the path to the cart with id of X".

这篇关于缺少必需的键的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！