I've created a shopping cart with line items that exist in the session object. I can't figure out how I link to my shopping cart show page if the cart exists and just link to a 'cart is empty' page if it doesn't. What am I missing? My code is below:
View Link , I wasn't sure what I should put here and where to define it for example... "if current_cart.empty? cart", or "if @cart.line_items.empty? current_cart", etc.
<% if current_cart.line_items.empty?%>
<%= link_to "cart", cart_path, :class =>'headertab' %>
<% else %>
<%= link_to "cart", cart_path(current_cart), :class =>'headertab' %>
<% end %>
This gives me the following error:
Showing /Users/dave/rails_projects/EquiptMe/app/views/layouts/_headerexterior.html.erb where line #20 raised:
undefined local variable or method `current_cart' for #<#<Class:0x007fae841cc8e0>:0x007fae83339698>
Extracted source (around line #20):
17: <li><%= link_to "browse gear", '/gear', :class =>'headertab' %></li>
18: <li><%= link_to "join", '/signup', :class =>'headertab' %></li>
19: <li>
20: <% if current_cart.line_items.empty?%>
21: <%= link_to "cart", cart_path, :class =>'headertab' %>
22: <% else %>
23: <%= link_to "cart", cart_path(current_cart), :class =>'headertab' %>
Routes
Outdoor::Application.routes.draw do
resources :line_items
resources :carts
.....
Application Controller
class ApplicationController < ActionController::Base
protect_from_forgery
private
def current_cart
Cart.find(session[:cart_id])
rescue ActiveRecord::RecordNotFound
cart = Cart.create
session[:cart_id] = cart.id
cart
end
end
Carts Controller "Show", "Destroy" & "Create"
def show
begin
@cart = Cart.find(params[:id])
rescue ActiveRecord::RecordNotFound
logger.error "Attempt to access invalid cart #{params[:id]}"
redirect_to '/gear', notice: 'Invalid cart'
else
respond_to do |format|
format.html # show.html.erb
format.json { render json: @cart }
end
end
def destroy
@cart = current_cart
@cart.destroy
session[:cart_id] = nil
respond_to do |format|
format.html { redirect_to carts_url, notice: 'Your cart is currently empty' }
format.json { head :no_content }
end
end
def create
@cart = Cart.new(params[:cart])
respond_to do |format|
if @cart.save
format.html { redirect_to @cart, notice: 'Cart was successfully created.' }
format.json { render json: @cart, status: :created, location: @cart }
else
format.html { render action: "new" }
format.json { render json: @cart.errors, status: :unprocessable_entity }
end
end
end
Line Items Controller "Create"
def create
@cart = current_cart
gear = Gear.find(params[:gear_id])
@line_item = @cart.add_gear(gear.id)
respond_to do |format|
if @line_item.save
format.html { redirect_to @line_item.cart }
format.json { render json: @line_item, status: :created, location: @line_item }
else
format.html { render action: "new" }
format.json { render json: @line_item.errors, status: :unprocessable_entity }
end
end
end
end
Thanks for the help!
From your code, you always have a created Cart
object. Your current_cart
method, will always return new
or previously created Cart
object, so you have to link to cart_path(current_cart)
.
<%= link_to "my cart", cart_path(current_cart), :class =>'headertab' %>
In another case, if you want to check if the cart is empty? In this case you have to use current_cart.line_items.empty?
To access current_cart
in Views and Controllers add helper_method :current_cart
declaration to ApplicationController.
Code update:
class ApplicationController < ActionController::Base
protect_from_forgery
private
def current_cart
Cart.find(session[:cart_id])
rescue ActiveRecord::RecordNotFound
cart = Cart.create
session[:cart_id] = cart.id
cart
end
helper_method :current_cart
end
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