feat: added shop models

2024-03-24 14:31:35 +01:00
parent b8562b3d7b
commit 22cea344a5
13 changed files with 570 additions and 1 deletions
@@ -0,0 +1,169 @@
+from decimal import Decimal
+
+from django.db import models
+from django.utils import timezone
+from django.utils.text import gettext_lazy as _
+
+
+class Product(models.Model):
+    class UnitChoices(models.TextChoices):
+        UNIT = "UNIT", _("Unidad")
+        WEIGHT_KG = "KG", _("kg")
+        VOLUME_LITER = "L", _("L")
+
+    name = models.CharField(
+        max_length=96,
+        blank=False,
+        null=False,
+        verbose_name=_("Nombre"),
+    )
+    description = models.CharField(
+        max_length=1000,
+        blank=True,
+        default="",
+        verbose_name=_("Descripción"),
+    )
+    stock = models.DecimalField(
+        max_digits=13,
+        decimal_places=4,
+        default=Decimal("0"),
+        verbose_name=_("Stock"),
+    )
+    unit = models.CharField(
+        max_length=6,
+        choices=UnitChoices.choices,
+        default=UnitChoices.UNIT,
+        verbose_name=_("Unidad de medida"),
+    )
+
+    def __str__(self):
+        return self.name
+
+    class Meta:
+        verbose_name = _("Producto")
+        verbose_name_plural = _("Productos")
+
+
+class ProductPrice(models.Model):
+    price = models.DecimalField(
+        max_digits=11, decimal_places=2, verbose_name=_("Precio")
+    )
+    date = models.DateTimeField(default=timezone.now, verbose_name=_("Fecha"))
+    product = models.ForeignKey(
+        "shop.Product",
+        on_delete=models.CASCADE,
+        verbose_name=_("Producto"),
+        related_name="prices",
+    )
+
+    def __str__(self):
+        return f"{self.price}"
+
+    class Meta:
+        verbose_name = _("Precio de producto")
+        verbose_name_plural = _("Precio de producto")
+
+
+class Tax(models.Model):
+    code = models.CharField(
+        max_length=8, blank=False, unique=True, verbose_name=_("Código de impuesto")
+    )
+    value = models.PositiveIntegerField(
+        null=False, blank=False, verbose_name=_("Valor entero (porcentaje)")
+    )
+
+    def __str__(self):
+        return f"{self.code} - {self.value}%"
+
+    class Meta:
+        verbose_name = _("Impuesto")
+        verbose_name_plural = _("Impuestos")
+
+
+class OrderLine(models.Model):
+    product = models.ForeignKey(
+        "shop.Product",
+        on_delete=models.CASCADE,
+        null=False,
+        blank=False,
+        verbose_name=_("Producto"),
+    )
+    quantity = models.DecimalField(
+        max_digits=13,
+        decimal_places=4,
+        default=Decimal("1"),
+        null=False,
+        blank=False,
+        verbose_name=_("Cantidad"),
+    )
+
+    # Precio del producto en el momento en el que se crea el pedido
+    price = models.DecimalField(
+        max_digits=13, decimal_places=4, verbose_name=_("Precio")
+    )
+
+    # base_total = quantity * price
+    base_total = models.DecimalField(
+        max_digits=13,
+        decimal_places=4,
+        default=Decimal("0"),
+        null=False,
+        blank=False,
+        verbose_name=_("Total sin impuestos"),
+    )
+
+    # Valor entero del impuesto en el momento en el que se crea el pedido
+    tax_value = models.PositiveIntegerField(
+        null=False, blank=False, verbose_name=_("Valor de impuestos")
+    )
+
+    # taxes = price * quantity * (tax_value / 100)
+    taxes = models.DecimalField(
+        max_digits=13, decimal_places=4, verbose_name=_("Impuestos")
+    )
+
+    # total = base_total + taxes
+    total = models.DecimalField(
+        max_digits=13, decimal_places=4, verbose_name=_("Total")
+    )
+
+    def __str__(self):
+        return f"{self.product.name} - {self.quantity} - {self.price}"
+
+    class Meta:
+        verbose_name = _("Línea de pedido")
+        verbose_name_plural = _("Líneas de pedido")
+
+
+class Order(models.Model):
+    lines = models.ManyToManyField("shop.OrderLine", verbose_name=_("Líneas"))
+    creation_date = models.DateTimeField(
+        auto_now_add=True, verbose_name=_("Fecha de creación")
+    )
+    last_modification_date = models.DateTimeField(
+        auto_now=True, verbose_name=_("Fecha de última modificación")
+    )
+
+    base_total = models.DecimalField(
+        default=Decimal("0"),
+        max_digits=13,
+        decimal_places=2,
+        verbose_name=_("Base imponible"),
+    )
+    total = models.DecimalField(
+        default=Decimal("0"), max_digits=13, decimal_places=2, verbose_name=_("Total")
+    )
+
+    def calculate_total_from_lines(self):
+        self.base_total = self.lines.aggregate(base_total=models.Sum("base_total")).get(
+            "base_total"
+        )
+        self.total = self.lines.aggregate(base_total=models.Sum("total")).get(
+            "base_total"
+        )
+
+        self.save()
+
+    class Meta:
+        verbose_name = _("Pedido")
+        verbose_name_plural = _("Pedidos")