Implement data model

poetry.lock

@@ -333,6 +333,18 @@ python-versions = ">=3.6"
 [package.dependencies]
 pyparsing = ">=2.0.2,<3.0.5 || >3.0.5"
 
+[[package]]
+name = "pillow"
+version = "9.1.0"
+description = "Python Imaging Library (Fork)"
+category = "main"
+optional = false
+python-versions = ">=3.7"
+
+[package.extras]
+docs = ["olefile", "sphinx (>=2.4)", "sphinx-copybutton", "sphinx-issues (>=3.0.1)", "sphinx-removed-in", "sphinx-rtd-theme (>=1.0)", "sphinxext-opengraph"]
+tests = ["check-manifest", "coverage", "defusedxml", "markdown2", "olefile", "packaging", "pyroma", "pytest", "pytest-cov", "pytest-timeout"]
+
 [[package]]
 name = "platformdirs"
 version = "2.5.2"
@@ -630,7 +642,7 @@ brotli = ["brotli"]
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.10"
-content-hash = "e141bb1b1bfaaea951e57b266d4cc4619e598f853d27f40964405303000e7ea8"
+content-hash = "86cec3b5cbae86ec8a2e77f3e77139e12c48bcc8aa79918daed41f56f48597f4"
 
 [metadata.files]
 asgiref = [
@@ -932,6 +944,46 @@ packaging = [
     {file = "packaging-21.3-py3-none-any.whl", hash = "sha256:ef103e05f519cdc783ae24ea4e2e0f508a9c99b2d4969652eed6a2e1ea5bd522"},
     {file = "packaging-21.3.tar.gz", hash = "sha256:dd47c42927d89ab911e606518907cc2d3a1f38bbd026385970643f9c5b8ecfeb"},
 ]
+pillow = [
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+    {file = "Pillow-9.1.0-cp37-cp37m-win_amd64.whl", hash = "sha256:de344bcf6e2463bb25179d74d6e7989e375f906bcec8cb86edb8b12acbc7dfef"},
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+    {file = "Pillow-9.1.0-cp38-cp38-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:8782189c796eff29dbb37dd87afa4ad4d40fc90b2742704f94812851b725964b"},
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+    {file = "Pillow-9.1.0-cp38-cp38-win_amd64.whl", hash = "sha256:c24f718f9dd73bb2b31a6201e6db5ea4a61fdd1d1c200f43ee585fc6dcd21b34"},
+    {file = "Pillow-9.1.0-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:fb89397013cf302f282f0fc998bb7abf11d49dcff72c8ecb320f76ea6e2c5717"},
+    {file = "Pillow-9.1.0-cp39-cp39-macosx_11_0_arm64.whl", hash = "sha256:c870193cce4b76713a2b29be5d8327c8ccbe0d4a49bc22968aa1e680930f5581"},
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+    {file = "Pillow-9.1.0-pp38-pypy38_pp73-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:c7110ec1701b0bf8df569a7592a196c9d07c764a0a74f65471ea56816f10e2c8"},
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+    {file = "Pillow-9.1.0.tar.gz", hash = "sha256:f401ed2bbb155e1ade150ccc63db1a4f6c1909d3d378f7d1235a44e90d75fb97"},
+]
 platformdirs = [
     {file = "platformdirs-2.5.2-py3-none-any.whl", hash = "sha256:027d8e83a2d7de06bbac4e5ef7e023c02b863d7ea5d079477e722bb41ab25788"},
     {file = "platformdirs-2.5.2.tar.gz", hash = "sha256:58c8abb07dcb441e6ee4b11d8df0ac856038f944ab98b7be6b27b2a3c7feef19"},

pyproject.toml

@@ -16,6 +16,7 @@ requests = "^2.27.1"
 django-extensions = "^3.1.5"
 bpython = "^0.22.1"
 gunicorn = "^20.1.0"
+Pillow = "^9.1.0"
 
 [tool.poetry.dev-dependencies]
 pre-commit = "^2.7"

src/checkout/settings.py

@@ -81,6 +81,7 @@ INSTALLED_APPS = [
     "anymail",
     "django_cleanup.apps.CleanupConfig",
     "common",
+    "purchase",
 ]
 
 MIDDLEWARE = [

src/purchase/admin.py

@@ -0,0 +1,42 @@
+from django.contrib import admin
+from django.contrib.admin import register
+
+from purchase.models import Basket, BasketItem, PaymentMethod, Product
+
+
+@register(Product)
+class ProductAdmin(admin.ModelAdmin):
+    list_display = ["name", "display_order", "unit_price"]
+    search_fields = ["name"]
+
+    def unit_price(self, instance: Product):
+        return instance.unit_price_cents / 100
+
+
+@register(PaymentMethod)
+class PaymentMethodAdmin(admin.ModelAdmin):
+    list_display = ["name"]
+    search_fields = ["name"]
+
+
+class BasketItemInline(admin.TabularInline):
+    model = BasketItem
+    fields = ["product", "quantity", "price"]
+    extra = 0
+    readonly_fields = ["price"]
+
+    def price(self, instance) -> float:
+        return instance.price / 100
+
+
+@register(Basket)
+class BasketAdmin(admin.ModelAdmin):
+    list_display = ["id", "status", "payment_method", "created_at", "price"]
+    fields = ["created_at", "status", "payment_method"]
+    list_filter = ["status", "payment_method"]
+    date_hierarchy = "created_at"
+    readonly_fields = ["created_at"]
+    inlines = [BasketItemInline]
+
+    def price(self, instance) -> float:
+        return instance.price / 100

src/purchase/apps.py

@@ -0,0 +1,6 @@
+from django.apps import AppConfig
+
+
+class PurchaseConfig(AppConfig):
+    default_auto_field = "django.db.models.BigAutoField"
+    name = "purchase"

src/purchase/migrations/0001_initial.py

@@ -0,0 +1,131 @@
+# Generated by Django 4.0.4 on 2022-04-24 14:14
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = []
+
+    operations = [
+        migrations.CreateModel(
+            name="Basket",
+            fields=[
+                (
+                    "id",
+                    models.BigAutoField(
+                        auto_created=True,
+                        primary_key=True,
+                        serialize=False,
+                        verbose_name="ID",
+                    ),
+                ),
+                ("created_at", models.DateTimeField(auto_now_add=True)),
+                ("updated_at", models.DateTimeField(auto_now=True)),
+                (
+                    "status",
+                    models.CharField(
+                        choices=[("DRAFT", "Draft"), ("COMPLETE", "Complete")],
+                        default="DRAFT",
+                        max_length=20,
+                    ),
+                ),
+            ],
+            options={
+                "abstract": False,
+            },
+        ),
+        migrations.CreateModel(
+            name="PaymentMethod",
+            fields=[
+                (
+                    "id",
+                    models.BigAutoField(
+                        auto_created=True,
+                        primary_key=True,
+                        serialize=False,
+                        verbose_name="ID",
+                    ),
+                ),
+                ("created_at", models.DateTimeField(auto_now_add=True)),
+                ("updated_at", models.DateTimeField(auto_now=True)),
+                ("name", models.CharField(max_length=50, unique=True)),
+            ],
+            options={
+                "abstract": False,
+            },
+        ),
+        migrations.CreateModel(
+            name="Product",
+            fields=[
+                (
+                    "id",
+                    models.BigAutoField(
+                        auto_created=True,
+                        primary_key=True,
+                        serialize=False,
+                        verbose_name="ID",
+                    ),
+                ),
+                ("created_at", models.DateTimeField(auto_now_add=True)),
+                ("updated_at", models.DateTimeField(auto_now=True)),
+                ("name", models.CharField(max_length=250, unique=True)),
+                ("image", models.ImageField(null=True, upload_to="")),
+                ("unit_price_cents", models.PositiveIntegerField()),
+                ("display_order", models.PositiveIntegerField()),
+            ],
+            options={
+                "ordering": ["display_order", "name"],
+            },
+        ),
+        migrations.CreateModel(
+            name="BasketItem",
+            fields=[
+                (
+                    "id",
+                    models.BigAutoField(
+                        auto_created=True,
+                        primary_key=True,
+                        serialize=False,
+                        verbose_name="ID",
+                    ),
+                ),
+                ("created_at", models.DateTimeField(auto_now_add=True)),
+                ("updated_at", models.DateTimeField(auto_now=True)),
+                ("quantity", models.PositiveIntegerField()),
+                (
+                    "basket",
+                    models.ForeignKey(
+                        on_delete=django.db.models.deletion.CASCADE,
+                        related_name="items",
+                        to="purchase.basket",
+                    ),
+                ),
+                (
+                    "product",
+                    models.ForeignKey(
+                        on_delete=django.db.models.deletion.PROTECT,
+                        related_name="basket_items",
+                        to="purchase.product",
+                    ),
+                ),
+            ],
+            options={
+                "abstract": False,
+            },
+        ),
+        migrations.AddField(
+            model_name="basket",
+            name="payment_method",
+            field=models.ForeignKey(
+                blank=True,
+                null=True,
+                on_delete=django.db.models.deletion.PROTECT,
+                related_name="baskets",
+                to="purchase.paymentmethod",
+            ),
+        ),
+    ]

src/purchase/migrations/0002_alter_product_image.py

@@ -0,0 +1,18 @@
+# Generated by Django 4.0.4 on 2022-04-24 14:15
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("purchase", "0001_initial"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="product",
+            name="image",
+            field=models.ImageField(blank=True, null=True, upload_to=""),
+        ),
+    ]

src/purchase/migrations/0003_alter_product_display_order.py

@@ -0,0 +1,22 @@
+# Generated by Django 4.0.4 on 2022-04-24 14:17
+
+from django.db import migrations, models
+
+import purchase.models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("purchase", "0002_alter_product_image"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="product",
+            name="display_order",
+            field=models.PositiveIntegerField(
+                default=purchase.models.default_product_display_order
+            ),
+        ),
+    ]

src/purchase/models.py

@@ -0,0 +1,73 @@
+from django.db import models
+
+
+class Model(models.Model):
+    created_at = models.DateTimeField(auto_now_add=True)
+    updated_at = models.DateTimeField(auto_now=True)
+
+    class Meta:
+        abstract = True
+
+
+class PaymentMethod(Model):
+    name = models.CharField(max_length=50, unique=True)
+
+    def __str__(self):
+        return self.name
+
+
+def default_product_display_order():
+    return Product.objects.last().display_order + 1
+
+
+class Product(Model):
+    name = models.CharField(max_length=250, unique=True)
+    image = models.ImageField(null=True, blank=True)
+    unit_price_cents = models.PositiveIntegerField()
+    display_order = models.PositiveIntegerField(default=default_product_display_order)
+
+    class Meta:
+        ordering = ["display_order", "name"]
+
+    def __str__(self):
+        return self.name
+
+
+class Basket(Model):
+    STATUS_DRAFT = "DRAFT"
+    STATUS_COMPLETE = "COMPLETE"
+    _STATUS_CHOICES = [
+        (STATUS_DRAFT, "Draft"),
+        (STATUS_COMPLETE, "Complete"),
+    ]
+    payment_method = models.ForeignKey(
+        to=PaymentMethod,
+        on_delete=models.PROTECT,
+        related_name="baskets",
+        null=True,
+        blank=True,
+    )
+    status = models.CharField(
+        max_length=20, choices=_STATUS_CHOICES, default=STATUS_DRAFT
+    )
+
+    def __str__(self):
+        return f"Panier #{self.id}"
+
+    @property
+    def price(self) -> int:
+        return sum(item.price for item in self.items.all())
+
+
+class BasketItem(Model):
+    product = models.ForeignKey(
+        to=Product, on_delete=models.PROTECT, related_name="basket_items"
+    )
+    basket = models.ForeignKey(
+        to=Basket, on_delete=models.CASCADE, related_name="items"
+    )
+    quantity = models.PositiveIntegerField()
+
+    @property
+    def price(self) -> int:
+        return self.product.unit_price_cents * self.quantity

src/purchase/tests.py

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

src/purchase/views.py

@@ -0,0 +1,3 @@
+from django.shortcuts import render
+
+# Create your views here.