Chapter 9, Coupons impleted

cart/cart.py

@@ -3,6 +3,7 @@
 from django.conf import settings
 
 from shop.models import Product
+from coupons.models import Coupon
 from common.constants import (KEY_PRICE, KEY_QUANTITY, KEY_PRODUCT, KEY_TOTAL_PRICE)
 
 
@@ -15,11 +16,29 @@ def __init__(self, request):
         """
 
         self.session = request.session
+        self.coupon_id = self.session.get('coupon_id')
         cart = self.session.get(settings.SESSION_CART_ID)
         if not cart:
             cart = self.session[settings.SESSION_CART_ID] = {}
         self.cart = cart
 
+    @property
+    def coupon(self):
+        if self.coupon_id:
+            try:
+                return Coupon.objects.get(id=self.coupon_id)
+            except Coupon.DoesNotExist:
+                pass
+        return None
+
+    def get_discount(self):
+        if self.coupon:
+            return (self.coupon.discount / Decimal(100)) * self.get_total_price()
+        return Decimal(0)
+
+    def get_price_after_coupon(self):
+        return self.get_total_price() - self.get_discount()
+
     def add(self, product, quantity=1, override_quantity=False):
         """
         Add Item in cart or update its quantity

cart/forms.py

@@ -1,9 +1,11 @@
 from django import forms
+from django.utils.translation import gettext_lazy as _
 
 PRODUCT_QUANTITY_CHOICES = [(i, str(i)) for i in range(1, 21)]
 
 
 class CartAddProductForm(forms.Form):
-    quantity = forms.TypedChoiceField(choices=PRODUCT_QUANTITY_CHOICES, coerce=int)
+    quantity = forms.TypedChoiceField(choices=PRODUCT_QUANTITY_CHOICES, coerce=int,
+                                      label=_('Quantity'))
     override = forms.BooleanField(required=False, initial=False, widget=forms.HiddenInput)
 

cart/templates/cart/cart_details.html

@@ -1,19 +1,20 @@
 {% extends 'shop/base.html' %}
 {% load static %}
+{% load i18n %}
 
-{% block title %} Your shopping Cart {% endblock %}
+{% block title %} {% trans 'Your shopping Cart' %} {% endblock %}
 
 {% block content %}
-<h1>Your shopping cart</h1>
+<h1>{% trans 'Your shopping cart' %}</h1>
 <table class="cart">
     <thead>
     <tr>
-        <th>Image</th>
-        <th>Product</th>
-        <th>Quantity</th>
-        <th>Remove</th>
-        <th>Unit Price</th>
-        <th>Price</th>
+        <th>{% trans 'Image' %}</th>
+        <th>{% trans 'Product' %}</th>
+        <th>{% trans 'Quantity' %}</th>
+        <th>{% trans 'Remove' %}</th>
+        <th>{% trans 'Unit Price' %}</th>
+        <th>{% trans 'Price' %}</th>
     </tr>
     </thead>
     <tbody>
@@ -36,24 +37,50 @@ <h1>Your shopping cart</h1>
                 </td>
                 <td>
                     <form action='{% url "cart:cart_remove" product.id %}' method="post">
-                        <input type="submit" value="Remove Item">
+                        <input type="submit" value="{% trans 'Remove Item' %}">
                         {% csrf_token %}
                     </form>
                 </td>
                 <td>{{item.price}}</td>
                 <td>{{item.total_price}}</td>
             </tr>
+            {% if cart.coupon %}
+                <tr class="subtotal">
+                    <td>{% trans 'Subtotal' %}</td>
+                    <td colspan="4"></td>
+                    <td class="num">${{cart.get_total_price|floatformat:2}}</td>
+                </tr>
+                <tr>
+                    <td>
+                        "{{cart.coupon.code}}" coupon
+                        ({{cart.coupon.discount}} off)
+                    </td>
+                    <td colspan="4"></td>
+                    <td class="num neg">
+                        - ${{cart.get_discount|floatformat:2}}
+                    </td>
+                </tr>
+            {% endif %}
         {% endwith %}
     {% endfor %}
     <tr>
-        <td>Total</td>
+        <td>{% trans 'Total' %}</td>
         <td colspan="4"></td>
-        <td class="num">${{cart.get_total_price}}</td>
+        <td class="num">${{cart.get_price_after_coupon|floatformat:2}}</td>
     </tr>
     </tbody>
 </table>
+<div class="coupon">
+    <p>{% trans 'Apply a Coupon' %}</p>
+    <form action="{% url 'coupons:apply' %}" method="post">
+        {{coupon_apply_form}}
+        {% csrf_token %}
+        <input type="submit" value="{% trans 'Apply' %}">
+    </form>
+</div>
+
 <p class="text-right">
-    <a href="{% url 'shop:product_list' %}" class="button light">Continue Shopping</a>
-    <a href="{% url 'orders:order_create' %}" class="button">Checkout</a>
+    <a href="{% url 'shop:product_list' %}" class="button light">{% trans 'Continue Shopping' %}</a>
+    <a href="{% url 'orders:order_create' %}" class="button">{% trans 'Checkout' %}</a>
 </p>
 {% endblock %}

cart/views.py

@@ -4,6 +4,7 @@
 from .cart import Cart
 from .forms import CartAddProductForm
 from shop.models import Product
+from coupons.forms import CouponApplyForm
 from common.constants import KEY_QUANTITY
 
 
@@ -30,8 +31,10 @@ def cart_remove(request, product_id):
 
 def cart_details(request):
     cart = Cart(request)
+    coupon_apply_form = CouponApplyForm()
     for item in cart:
         item['product_update_form'] = CartAddProductForm(initial={
             KEY_QUANTITY: item.get(KEY_QUANTITY), 'override': True
         })
-    return render(request, 'cart/cart_details.html', {'cart': cart})
+    return render(request, 'cart/cart_details.html', {'cart': cart,
+                                                      'coupon_apply_form': coupon_apply_form})

coupons/admin.py

@@ -0,0 +1,10 @@
+from django.contrib import admin
+
+from .models import Coupon
+
+
+@admin.register(Coupon)
+class CouponAdmin(admin.ModelAdmin):
+    list_display = ['code', 'valid_from', 'valid_to', 'discount', 'active', 'total_coupons', 'availed_coupons']
+    list_filter = ['active', 'valid_to', 'valid_from']
+    search_fields = ['code']

coupons/apps.py

@@ -0,0 +1,5 @@
+from django.apps import AppConfig
+
+
+class CouponsConfig(AppConfig):
+    name = 'coupons'

coupons/forms.py

@@ -0,0 +1,6 @@
+from django import forms
+from django.utils.translation import gettext_lazy as _
+
+
+class CouponApplyForm(forms.Form):
+    code = forms.CharField(label=_('Code'))

coupons/migrations/0001_initial.py

@@ -0,0 +1,28 @@
+# Generated by Django 3.1.3 on 2021-12-31 18:47
+
+import django.core.validators
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Coupon',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('code', models.CharField(db_index=True, max_length=32, unique=True)),
+                ('valid_from', models.DateTimeField()),
+                ('valid_to', models.DateTimeField()),
+                ('discount', models.IntegerField(validators=[django.core.validators.MinValueValidator(0), django.core.validators.MaxValueValidator(100)])),
+                ('active', models.BooleanField()),
+                ('total_coupons', models.PositiveIntegerField(default=3)),
+                ('availed_coupons', models.PositiveIntegerField(default=0)),
+            ],
+        ),
+    ]

coupons/models.py

@@ -0,0 +1,15 @@
+from django.db import models
+from django.core.validators import MinValueValidator, MaxValueValidator
+
+
+class Coupon(models.Model):
+    code = models.CharField(max_length=32, unique=True, db_index=True)
+    valid_from = models.DateTimeField()
+    valid_to = models.DateTimeField()
+    discount = models.IntegerField(validators=[MinValueValidator(0), MaxValueValidator(100)])
+    active = models.BooleanField()
+    total_coupons = models.PositiveIntegerField(default=3)
+    availed_coupons = models.PositiveIntegerField(default=0)
+
+    def __str__(self):
+        return f"Coupon code:{self.code}"

coupons/tests.py

@@ -0,0 +1,3 @@
+from django.test import TestCase
+
+# Create your tests here.

coupons/urls.py

@@ -0,0 +1,10 @@
+from django.urls import path
+
+from .views import coupon_apply
+
+app_name = 'coupons'
+
+
+urlpatterns = [
+    path('apply/', coupon_apply, name='apply')
+]

coupons/views.py

@@ -0,0 +1,21 @@
+from django.utils import timezone
+from django.shortcuts import render, redirect
+from django.views.decorators.http import require_POST
+
+from .models import Coupon
+from .forms import CouponApplyForm
+
+
+@require_POST
+def coupon_apply(request):
+    now = timezone.now()
+    form = CouponApplyForm(request.POST)
+    if form.is_valid():
+        code = form.cleaned_data['code']
+        try:
+            coupon = Coupon.objects.get(code=code, valid_from__lte=now, valid_to__gte=now, active=True)
+            request.session['coupon_id'] = coupon.id
+        except Coupon.DoesNotExist:
+            request.session['coupon_id'] = None
+
+    return redirect('cart:cart_details')

eShop/settings.py

@@ -12,6 +12,7 @@
 
 import os
 import braintree
+from django.utils.translation import gettext_lazy as _
 # Build paths inside the project like this: os.path.join(BASE_DIR, ...)
 
 BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
@@ -39,11 +40,13 @@
     'cart.apps.CartConfig',
     'orders.apps.OrdersConfig',
     'payment.apps.PaymentConfig',
+    'coupons.apps.CouponsConfig'
 ]
 
 MIDDLEWARE = [
     'django.middleware.security.SecurityMiddleware',
     'django.contrib.sessions.middleware.SessionMiddleware',
+    'django.middleware.locale.LocaleMiddleware',
     'django.middleware.common.CommonMiddleware',
     'django.middleware.csrf.CsrfViewMiddleware',
     'django.contrib.auth.middleware.AuthenticationMiddleware',
@@ -106,7 +109,12 @@
 # Internationalization
 # https://docs.djangoproject.com/en/2.2/topics/i18n/
 
-LANGUAGE_CODE = 'en-us'
+LANGUAGE_CODE = 'en'
+LANGUAGES = (
+    ('en', _('English')),
+    ('es', _('Spanish')),
+    ('ur', _('Urdu')),
+)
 
 TIME_ZONE = 'UTC'
 
@@ -119,6 +127,9 @@
 MEDIA_URL = '/media/'
 MEDIA_ROOT = os.path.join(BASE_DIR, 'media/')
 STATIC_ROOT = os.path.join(BASE_DIR, 'static/')
+LOCALE_PATHS = (
+    os.path.join(BASE_DIR, 'locale/'),
+)
 
 # Static files (CSS, JavaScript, Images)
 # https://docs.djangoproject.com/en/2.2/howto/static-files/
@@ -133,6 +144,10 @@
 EMAIL_BACKEND = 'django.core.mail.backends.smtp.EmailBackend'
 # EMAIL_BACKEND = 'django.core.mail.backends.console.EmailBackend'
 
+REDIS_HOST = 'localhost'
+REDIS_PORT = '6379'
+REDIS_DB = 1
+
 try:
     from .local_settings import *  # pylint: disable=all
 except:  # pylint: disable=bare-except

eShop/urls.py

@@ -17,13 +17,15 @@
 from django.conf import settings
 from django.urls import path, include
 from django.conf.urls.static import static
+from django.conf.urls.i18n import i18n_patterns
 
-urlpatterns = [
+urlpatterns = i18n_patterns(
     path('admin/', admin.site.urls),
     path('payment/', include('payment.urls', namespace='payment')),
     path('cart/', include('cart.urls', namespace='cart')),
     path('orders/', include('orders.urls', namespace='orders')),
+    path('coupons/', include('coupons.urls', namespace='coupons')),
     path('', include('shop.urls', namespace='shop')),
-]
+)
 if settings.DEBUG:
     urlpatterns += static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)