Add a Seat Selection to Shopping Cart

Introduce the Cart model. When a visitor first makes a request to any controller, a Cart record is generated with a secure, unique token by utilizing the has_secure_token macro. Once created, that token is stored between requests in cookies[:cart_token].

The Cart model associates Seat records that the visitor has selected through the SeatSelection model.

This commit adds support for selecting a Seat and adding it to their Cart. Tests are included that ensure that the same Seat cannot be selected multiple times.

Selected Seat information is rendered in the page’s sidebar.

Desktop

select


      app/controllers/application_controller.rb

diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index 09705d1..8533404 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -1,2 +1,9 @@
 class ApplicationController < ActionController::Base
+  before_action do
+    cart_token = cookies[:cart_token]
+
+    Current.cart ||= Cart.create_or_find_by(token: cart_token)
+
+    cookies[:cart_token] ||= Current.cart.token
+  end
 end


      app/controllers/selections_controller.rb

diff --git a/app/controllers/selections_controller.rb b/app/controllers/selections_controller.rb
new file mode 100644
index 0000000..2d6f971
--- /dev/null
+++ b/app/controllers/selections_controller.rb
@@ -0,0 +1,9 @@
+class SelectionsController < ApplicationController
+  def create
+    seat = Seat.find(params[:seat_id])
+
+    Current.cart.seat_selections.create_or_find_by(seat: seat)
+
+    redirect_to venue_floor_seats_url(seat.venue, seat.floor)
+  end
+end


      app/models/cart.rb

diff --git a/app/models/cart.rb b/app/models/cart.rb
new file mode 100644
index 0000000..62b78c9
--- /dev/null
+++ b/app/models/cart.rb
@@ -0,0 +1,6 @@
+class Cart < ApplicationRecord
+  has_secure_token
+
+  has_many :seat_selections
+  has_many :seats, through: :seat_selections
+end


      app/models/current.rb

diff --git a/app/models/current.rb b/app/models/current.rb
new file mode 100644
index 0000000..1624f40
--- /dev/null
+++ b/app/models/current.rb
@@ -0,0 +1,3 @@
+class Current < ActiveSupport::CurrentAttributes
+  attribute :cart
+end


      app/models/seat.rb

diff --git a/app/models/seat.rb b/app/models/seat.rb
index 64992de..ac98874 100644
--- a/app/models/seat.rb
+++ b/app/models/seat.rb
@@ -1,5 +1,7 @@
 class Seat < ApplicationRecord
   belongs_to :section
+  has_one :floor, through: :section
+  has_one :venue, through: :floor
 
   def self.find_by_row_number!(row_number)
     row, number = row_number.split("-")


      app/models/seat_selection.rb

diff --git a/app/models/seat_selection.rb b/app/models/seat_selection.rb
new file mode 100644
index 0000000..008a302
--- /dev/null
+++ b/app/models/seat_selection.rb
@@ -0,0 +1,4 @@
+class SeatSelection < ApplicationRecord
+  belongs_to :seat
+  belongs_to :cart
+end


      app/views/seats/index.html.erb

diff --git a/app/views/seats/index.html.erb b/app/views/seats/index.html.erb
index b88ad58..1fa0c41 100644
--- a/app/views/seats/index.html.erb
+++ b/app/views/seats/index.html.erb
@@ -71,6 +71,26 @@
           </thead>
 
           <tbody>
+            <% Current.cart.seats.each do |seat| %>
+              <tr>
+                <td>
+                  <%= seat.row_number %>
+                </td>
+                <td class="syos-table__cell--numerals">
+                  <%= number_to_currency(seat.section.price / 100.0) %>
+                </td>
+                <td class="syos-u-text-align-right">
+                  <button class="syos-button syos-button--transparent">
+                    <%= inline_svg_tag(
+                      "icons/x-circle.svg",
+                      aria: true,
+                      class: "syos-icon",
+                      title: "Remove",
+                    ) %>
+                  </button>
+                </td>
+              </tr>
+            <% end %>
           </tbody>
         </table>
       </div>


      app/views/seats/show.html.erb

diff --git a/app/views/seats/show.html.erb b/app/views/seats/show.html.erb
index 666b316..bfdd3d9 100644
--- a/app/views/seats/show.html.erb
+++ b/app/views/seats/show.html.erb
@@ -59,11 +59,11 @@
       </div>
 
       <div class="syos-inline-stack__item">
-        <button
-          class="syos-button"
-        >
-          Select
-        </button>
+        <%= button_to(
+          "Select",
+          seat_selections_path(seat),
+          class: "syos-button",
+        ) %>
       </div>
     </div>
   </footer>


      config/routes.rb

diff --git a/config/routes.rb b/config/routes.rb
index 384d8e3..1f8d5ed 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -6,5 +6,9 @@ Rails.application.routes.draw do
     end
   end
 
+  resources :seats, only: [] do
+    resources :selections, only: [:create]
+  end
+
   root to: redirect("/venues/benedum_center/floors/orchestra/seats")
 end


      db/migrate/20190525190929_create_carts.rb

diff --git a/db/migrate/20190525190929_create_carts.rb b/db/migrate/20190525190929_create_carts.rb
new file mode 100644
index 0000000..025714d
--- /dev/null
+++ b/db/migrate/20190525190929_create_carts.rb
@@ -0,0 +1,10 @@
+class CreateCarts < ActiveRecord::Migration[6.0]
+  def change
+    create_table :carts do |t|
+      t.string :token, null: false
+
+      t.timestamps
+    end
+    add_index :carts, :token, unique: true
+  end
+end


      db/migrate/20190525190937_create_seat_selections.rb

diff --git a/db/migrate/20190525190937_create_seat_selections.rb b/db/migrate/20190525190937_create_seat_selections.rb
new file mode 100644
index 0000000..c6a9987
--- /dev/null
+++ b/db/migrate/20190525190937_create_seat_selections.rb
@@ -0,0 +1,12 @@
+class CreateSeatSelections < ActiveRecord::Migration[6.0]
+  def change
+    create_table :seat_selections do |t|
+      t.references :seat, null: false, foreign_key: true
+      t.references :cart, null: false, foreign_key: true
+
+      t.timestamps
+    end
+
+    add_index :seat_selections, [:seat_id, :cart_id], unique: true
+  end
+end


      test/controllers/seats_controller_test.rb

diff --git a/test/controllers/seats_controller_test.rb b/test/controllers/seats_controller_test.rb
new file mode 100644
index 0000000..67e9ce7
--- /dev/null
+++ b/test/controllers/seats_controller_test.rb
@@ -0,0 +1,24 @@
+require "test_helper"
+
+class SeatsControllerTest < ActionDispatch::IntegrationTest
+  test "#index when a Cart exists, does not create a new one" do
+    venue = create(:benedum_center)
+    floor = create(:orchestra, venue: venue)
+    cart = create(:cart)
+
+    cookies[:cart_token] = cart.token
+    get venue_floor_seats_path(venue, floor)
+
+    assert_equal Cart.count, 1
+    assert_equal cookies[:cart_token], cart.token
+  end
+
+  test "#index when a Cart does not exist, creates a new one" do
+    venue = create(:benedum_center)
+    floor = create(:orchestra, venue: venue)
+
+    get venue_floor_seats_path(venue, floor)
+
+    assert_equal Cart.last.token, cookies[:cart_token]
+  end
+end


      test/controllers/selections_controller_test.rb

diff --git a/test/controllers/selections_controller_test.rb b/test/controllers/selections_controller_test.rb
new file mode 100644
index 0000000..f4a817d
--- /dev/null
+++ b/test/controllers/selections_controller_test.rb
@@ -0,0 +1,22 @@
+require "test_helper"
+
+class SelectionsControllerTest < ActionDispatch::IntegrationTest
+  test "#create when a Seat is not selected" do
+    seat = create(:seat)
+
+    post seat_selections_path(seat)
+
+    assert_equal SeatSelection.pluck(:seat_id), [seat.id]
+  end
+
+  test "#create when a Seat is already selected" do
+    seat_selection = create(:seat_selection)
+    cart = seat_selection.cart
+    seat = seat_selection.seat
+    cookies[:cart_token] = cart.token
+
+    post seat_selections_path(seat)
+
+    assert_equal cart.seats.ids, [seat.id]
+  end
+end


      test/factories.rb

diff --git a/test/factories.rb b/test/factories.rb
index 45a2575..44cf93c 100644
--- a/test/factories.rb
+++ b/test/factories.rb
@@ -19,6 +19,9 @@ FactoryBot.define do
     price { 10_00 }
   end
 
+  factory :cart do
+  end
+
   factory :seat do
     association :section
 
@@ -27,4 +30,9 @@ FactoryBot.define do
     x { 0 }
     y { 0 }
   end
+
+  factory :seat_selection do
+    association(:cart)
+    association(:seat)
+  end
 end


      test/system/visitor_selects_seat_test.rb

diff --git a/test/system/visitor_selects_seat_test.rb b/test/system/visitor_selects_seat_test.rb
new file mode 100644
index 0000000..db805d2
--- /dev/null
+++ b/test/system/visitor_selects_seat_test.rb
@@ -0,0 +1,17 @@
+require "application_system_test_case"
+
+class VisitorSelectsSeatTest < ApplicationSystemTestCase
+  test "visiting the seat page" do
+    venue = create(:benedum_center)
+    floor = create(:orchestra, venue: venue)
+    section = create(:section, floor: floor, price: 10_00)
+    seat = create(:seat, row: "AA", number: "101", section: section)
+
+    visit("/venues/benedum_center/floors/orchestra/seats/AA-101")
+    click_on("Select")
+
+    within("#cart-summary") do
+      assert_text "$10.00"
+    end
+  end
+end