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

[Roelof Wobben]

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 :

<li><%= link_to '<i class="fa fa-money"></i> Card'.html_safe, cart_path %> </li>

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

[Vivek Sampara]

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| %>

  <li><%= link_to '<i class="fa fa-money"></i> Card'.html_safe, cart_path(card) %> </li>

<% end %>

This way, rails would know "which" exact card this link should take them to. 

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[Roelof Wobben]

Hello,

It's is the form of  /cards/:id

I tried

 <li><%= link_to '<i class="fa fa-money"></i> Card'.html_safe, cart_path(cart) %> </li>

 <li><%= link_to '<i class="fa fa-money"></i> Card'.html_safe, cart_path(card) %> </li>

but on both I see this message :

undefined local variable or method `cart'

undefined local variable or method `card'

 
Roelof

Op maandag 8 december 2014 14:23:33 UTC+1 schreef Vivek Sampara:

[Vivek Sampara]

If you're on  "/cards/:id", then look at your cards_controller.rb  , you'd see @card defined , hence you should use   <li><%= link_to '<i class="fa fa-money"></i> Card'.html_safe, cart_path(@card) %> </li>

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 

<li><%= link_to '<i class="fa fa-money"></i> Card'.html_safe, cart_path(@cart) %> </li>

 

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 

To view this discussion on the web visit https://groups.google.com/d/msgid/rubyonrails-talk/46cea06c-0a2c-41e2-88c5-b3516c76c504%40googlegroups.com.

[Roelof Wobben]

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

Op maandag 8 december 2014 14:38:20 UTC+1 schreef Vivek Sampara: