Finished Chapter 10

Author: Yosef-AlSabbah

cart/templates/cart/detail.html

@@ -28,6 +28,8 @@ <h1>Your shopping cart</h1>
 
 
 
+
+
                                     {% if product.image %}{{ product.image.url }}{% else %}{% static "img/no_image.png" %}{% endif %}">
                         </a>
                     </td>
@@ -80,6 +82,20 @@ <h1>Your shopping cart</h1>
 
         </tbody>
     </table>
+    {% if recommended_products %}
+        <div class="recommendations cart">
+            <h3>People who bought this also bought</h3>
+            {% for p in recommended_products %}
+                <div class="item">
+                    <a href="{{ p.get_absolute_url }}">
+                        <img src="
+                                {% if p.image %}{{ p.image.url }}{% else %}{% static "img/no_image.png" %}{% endif %}">
+                    </a>
+                    <p><a href="{{ p.get_absolute_url }}">{{ p.name }}</a></p>
+                </div>
+            {% endfor %}
+        </div>
+    {% endif %}
     <p>Apply a coupon:</p>
     <form action="{% url "coupons:apply" %}" method="post">
         {{ coupon_apply_form }}

cart/views.py

@@ -3,6 +3,7 @@
 
 from coupons.froms import CouponApplyForm
 from shop.models import Product
+from shop.recommender import Recommender
 from .cart import Cart
 from .forms import CartAddProductForm
 
@@ -36,12 +37,18 @@ def cart_detail(request):
                 'override': True,
             }
         )
+    cart_products = [item for item in cart]
+    if cart_products:
+        r = Recommender()
+        recommended_products = r.suggest_products_for(cart_products, 4)
+    recommended_products = []
     coupon_apply_form = CouponApplyForm()
     return render(
         request,
         'cart/detail.html',
         context={
             'cart': cart,
-            'coupon_apply_form': coupon_apply_form
+            'coupon_apply_form': coupon_apply_form,
+            'recommended_products': recommended_products
         }
     )

payment/tasks.py

@@ -4,9 +4,12 @@
 from celery import shared_task
 # from django.contrib.staticfiles import finders
 from django.core.mail import EmailMessage
+from django.shortcuts import get_object_or_404
 from django.template.loader import render_to_string
 
 from orders.models import Order
+from shop.models import Product
+from shop.recommender import Recommender
 
 
 @shared_task
@@ -35,3 +38,12 @@ def payment_completed(order_id):
     )
     # send e-mail
     email.send()
+
+
+@shared_task
+def add_items_for_recommender(order_id):
+    order = get_object_or_404(Order, id=order_id)
+    product_ids = order.items.values_list('product_id', flat=True)
+    products = Product.objects.filter(id__in=product_ids)
+    r = Recommender()
+    r.products_bought(products)

payment/webhooks.py

@@ -5,7 +5,7 @@
 from django.views.decorators.csrf import csrf_exempt
 
 from orders.models import Order
-from .tasks import payment_completed
+from .tasks import payment_completed, add_items_for_recommender
 
 
 @csrf_exempt
@@ -33,7 +33,9 @@ def stripe_webhook(request):
                 order.stripe_id = session.payment_intent
                 order.save()
                 # launch asynchronous task
+                add_items_for_recommender.delay(order.id)
                 payment_completed.delay(order.id)
+
     except ValueError:
         # Invalid payload
         return HttpResponse(status=400)

shop/recommender.py

@@ -14,7 +14,7 @@ class Recommender:
     def get_product_key(self, id):
         return f'product:{id}:purchased_with'
 
-    def products_brought(self, products):
+    def products_bought(self, products):
         product_ids = [product.id for product in products]
         for product_id in product_ids:
             for with_id in product_ids:
@@ -50,3 +50,7 @@ def suggest_products_for(self, products, max_result=6):
         suggested_products.sort(key=lambda x: suggested_product_ids.index(x.id))
 
         return suggested_products
+
+    def clear_purchases(self):
+        for id in Product.objects.values_list('id', flat=True):
+            r.delete(self.get_product_key(id))

shop/templates/shop/product/detail.html

@@ -20,5 +20,20 @@ <h2>
             <input type="submit" value="Add to cart">
         </form>
         {{ product.description|linebreaks }}
+        {% if recommended_products %}
+            <div class="recommendations">
+                <h3>People who bought this also bought</h3>
+                {% for p in recommended_products %}
+                    <div class="item">
+                        <a href="{{ p.get_absolute_url }}">
+                            <img src="
+
+                                    {% if p.image %}{{ p.image.url }}{% else %}{% static "img/no_image.png" %}{% endif %}">
+                        </a>
+                        <p><a href="{{ p.get_absolute_url }}">{{ p.name }}</a></p>
+                    </div>
+                {% endfor %}
+            </div>
+        {% endif %}
     </div>
 {% endblock %}

shop/views.py

@@ -2,6 +2,7 @@
 
 from cart.forms import CartAddProductForm
 from .models import Product, Category
+from .recommender import Recommender
 
 
 def product_list(request, category_slug=None):
@@ -27,11 +28,14 @@ def product_list(request, category_slug=None):
 def product_detail(request, id, slug):
     product = get_object_or_404(Product, available=True, id=id, slug=slug)
     cart_product_form = CartAddProductForm()
+    r = Recommender()
+    recommended_products = r.suggest_products_for([product], 4)
     return render(
         request,
         'shop/product/detail.html',
         context={
             'product': product,
             'cart_product_form': cart_product_form,
+            'recommended_products': recommended_products,
         }
     )