Shop cart implementation 🚀

Author: ivanyshak

app/assets/stylesheets/app/base/_base.scss

@@ -134,3 +134,28 @@ q {
 .pk-no-display {
   display: none !important;
 }
+
+.shopping_cart-icon {
+  display: inline-block;
+  position: fixed;
+  left: 1450px;
+  opacity: 80%;
+
+  &:hover {
+    opacity: 100%;
+  }
+}
+
+.cart_table {
+  margin: 40px;
+
+  table {
+    border-collapse: collapse;
+    width: 100%;
+  }
+
+  th, td {
+    text-align: left;
+    padding: 8px;
+  }
+}

app/views/layouts/app/_header.slim

@@ -67,8 +67,5 @@ header.pk-header class="#{header_classlist.compact.join(' ')}"
                     li.pk-header__li-list-item = register_link
                     li.pk-header__li-list-item = login_link
 
-              li.pk-list__unit
-                = link_to supporters_path do
-                  i.fas.fa-shopping-cart.fa-2x
               li.pk-list__unit
                 = support_us_link(class: 'btn pk-btn--green-bg donate-btn')

components/shop/Gemfile.lock

@@ -65,6 +65,11 @@ GEM
       rack-test (>= 0.6.3)
       regexp_parser (>= 1.5, < 3.0)
       xpath (~> 3.2)
+    carrierwave (1.3.2)
+      activemodel (>= 4.0.0)
+      activesupport (>= 4.0.0)
+      mime-types (>= 1.16)
+      ssrf_filter (~> 1.0)
     coderay (1.1.3)
     concurrent-ruby (1.1.8)
     crass (1.0.6)
@@ -125,6 +130,9 @@ GEM
       mini_mime (>= 0.1.1)
     marcel (1.0.1)
     method_source (1.0.0)
+    mime-types (3.3.1)
+      mime-types-data (~> 3.2015)
+    mime-types-data (3.2021.0225)
     mini_mime (1.1.0)
     minitest (5.14.4)
     nenv (0.3.0)
@@ -219,6 +227,7 @@ GEM
       activesupport (>= 4.0)
       sprockets (>= 3.0.0)
     sqlite3 (1.4.2)
+    ssrf_filter (1.0.7)
     temple (0.8.2)
     thor (1.1.0)
     thread_safe (0.3.6)

components/shop/app/controllers/shop/base_controller.rb

@@ -4,6 +4,10 @@ module Shop
   class BaseController < ApplicationController
     before_action :authenticate_user!
 
+    def current_order
+      session[:order_id] ? Shop::Order.find(session[:order_id]) : []
+    end
+
     private
 
     def render_form

components/shop/app/controllers/shop/items_controller.rb

@@ -3,6 +3,7 @@
 module Shop
   class ItemsController < BaseController
     helper_method :items
+    helper_method :current_order
 
     # @deprecated
     # def add_to_cart

components/shop/app/controllers/shop/order_items_controller.rb

@@ -3,20 +3,42 @@
 module Shop
   class OrderItemsController < BaseController
     helper_method :item
+    helper_method :order_items
+    helper_method :current_order
 
-    def index
+    def create
+      order_item = ::Shop::OrderItem.new(item_id: item.id, order_id: order_id, price: item.price)
+      order_item.save
+
+      redirect_to shop_items_path
     end
 
     def update
+      order_item.increase_quantity!
+      redirect_to shop_order_items_path
     end
 
     def destroy
+      order_item.reduce_quantity!
+      redirect_to shop_order_items_path
     end
 
     private
 
+    def order_items
+      order_items = Shop::OrderItem.includes(:item)
+    end
+
+    def order_item
+      @order_items ||= Shop::OrderItem.find(params[:id])
+    end
+
     def item
-      @items ||= Shop::Item.find(params[:id])
+      @items ||= Shop::Item.find(params[:item_id])
+    end
+
+    def order_id
+      session[:order_id] ||= Shop::Order.create.id
     end
   end
 end

components/shop/app/helpers/shop/item_helper.rb

@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+
+module Shop
+  module ItemHelper
+  end
+end

components/shop/app/models/shop/item.rb

@@ -5,6 +5,7 @@ class Item < ApplicationRecord
     self.table_name = 'shop_items'
 
     has_many :item_images
+    has_many :order_items
     accepts_nested_attributes_for :item_images
 
     scope :active, -> { where(published: true) }

components/shop/app/models/shop/order.rb

@@ -9,10 +9,17 @@ module Shop
   class Order < ApplicationRecord
     self.table_name = 'shop_orders'
 
+    enum status: { shopping_cart: 0, placed: 1, processing: 2, shipping: 3, complete: 4, canceled: 5 }
+
     has_many :order_items
+    has_many :items, through: :order_items
+
+    def total_sum
+      order_items.map(&:price).sum.to_f
+    end
 
-    def total
-      @totoal ||= 0
+    def order_items_count
+      order_items.count
     end
   end
 end

components/shop/app/models/shop/order_item.rb

@@ -1,14 +1,36 @@
 # frozen_string_literal: true
 
-# item_id
-# qty
-# price
-
 module Shop
   class OrderItem < ApplicationRecord
-    self.table_name = 'shop_orders'
+    self.table_name = 'shop_order_items'
+
+    validates_uniqueness_of :item_id
 
     belongs_to :order
     belongs_to :item
+
+    def increase_quantity!
+      self.quantity += 1
+      update_price(quantity)
+      save!
+    end
+
+    def reduce_quantity!
+      if self.quantity > 1
+        self.quantity -= 1
+        update_price(quantity)
+        save!
+      else
+        delete_order_item
+      end
+    end
+
+    def delete_order_item
+      destroy!
+    end
+
+    def update_price(qty)
+      self.price = item.price * qty
+    end
   end
 end