Hello,
I follow the Agile Web development book.
Now as a extra challenge I try to make the card visible on a seperate page.
So I made this link :
<%= link_to ' Card'.html_safe, cart_path %>
But now I see the above error message.
When I do card_path (:id) I see a message that there is no card with the id of id.
Roelof
What is the url you’re using to show this on a separate page ?
if its in the pattern of “/cards/:id/something” then you dont have to provide the card path as rails picks up @card object to build the path or you’ll have to pass the card variable inside the path method.
eg
<% @cards.each do |card| %>
<%= link_to ' Card'.html_safe, cart_path(card) %>
<% end %>
This way, rails would know “which” exact card this link should take them to.
Hello,
It’s is the form of /cards/:id
I tried
<%= link_to ' Card'.html_safe, cart_path(cart) %>
<%= link_to ' Card'.html_safe, cart_path(card) %>
but on both I see this message :
undefined local variable or method `cart'
undefined local variable or method `card'
Roelof
If you’re on “/cards/:id”, then look at your cards_controller.rb , you’d see @card defined , hence you should use
<%= link_to ‘ Card’.html_safe, cart_path(@card) %>
But why would you goto to the show page ( /cards/:id/ ) when you’re already on the page ? regarding the cart, You have to follow the same procedure. define @cart in the controller/action and use it like this
<%= link_to ' Card'.html_safe, cart_path(@cart) %>
If you can give more info on what you’re trying to do (app structure) , We can help you a bit better 
PS: i haven’t read the book
Cheers
Vivek
Im at the home page and I want to make a link to /card/:id
According to rake routes I have to use cart_path.
The carts route looks like this :
class CartsController < ApplicationController
before_action :set_cart, only: [:show, :edit, :update, :destroy]
def index
@carts = Cart.all
end
def show
end
def new
@cart = Cart.new
end
Which uses this file :
module CurrentCart
extend ActiveSupport::Concern
private
def set_cart
@cart = Cart.find(session[:cart_id])
rescue ActiveRecord::RecordNotFound
@cart = Cart.create
session[:cart_id] = @cart.id
end
end
So I have to figure out how to make the id of the card avaible on the url.
Roelof