feat: added product batches and provider models

shop/models.py

@@ -60,7 +60,7 @@ class ProductPrice(models.Model):
         return f"{self.price} - {self.tax.code}"
 
     @property
-    def price_with_tax(self):
+    def price_with_tax(self) -> Decimal:
         tax_value = self.price * Decimal(self.tax.value / 100)
         return round(self.price + tax_value, 2)
 
@@ -69,6 +69,30 @@ class ProductPrice(models.Model):
         verbose_name_plural = _("Precio de producto")
 
 
+class ProductBatch(models.Model):
+    code = models.CharField(
+        max_length=32, unique=True, db_index=True, verbose_name=_("Código")
+    )
+    product = models.ForeignKey(
+        "shop.Product", on_delete=models.PROTECT, verbose_name=_("Producto")
+    )
+    quantity = models.DecimalField(
+        max_digits=13,
+        decimal_places=4,
+        default=Decimal("1"),
+        verbose_name=_("Cantidad"),
+    )
+    creation_date = models.DateTimeField(
+        auto_now_add=True, verbose_name=_("Fecha de creación")
+    )
+    expiration_date = models.DateField(
+        blank=True, null=True, verbose_name=_("Fecha de caducidad / consumo preferente")
+    )
+
+    def __str__(self):
+        return f"{self.code} - {self.product.name} - {self.quantity}"
+
+
 class Tax(models.Model):
     code = models.CharField(
         max_length=8, blank=False, unique=True, verbose_name=_("Código de impuesto")
@@ -112,6 +136,38 @@ class Customer(models.Model):
         verbose_name_plural = _("Clientes")
 
 
+class Provider(models.Model):
+    vat_id = models.CharField(
+        max_length=32,
+        blank=False,
+        unique=True,
+        verbose_name=_("Documento de identidad"),
+    )
+    name = models.CharField(max_length=64, blank=False, verbose_name=_("Nombre"))
+
+    email = models.EmailField(blank=False, verbose_name=_("E-mail de contacto"))
+    phone = models.CharField(
+        max_length=16,
+        blank=True,
+        null=True,
+        default="",
+        verbose_name=_("Teléfono de contacto"),
+    )
+
+    address = models.CharField(max_length=255, blank=False, verbose_name=_("Dirección"))
+    city = models.CharField(max_length=64, blank=False, verbose_name=_("Ciudad"))
+    state = models.CharField(max_length=64, blank=False, verbose_name=_("Región"))
+    country = models.CharField(max_length=64, blank=False, verbose_name=_("País"))
+    zip = models.CharField(max_length=32, blank=False, verbose_name=_("Código postal"))
+
+    def __str__(self):
+        return f"{self.vat_id} - {self.name}"
+
+    class Meta:
+        verbose_name = _("Proveedor")
+        verbose_name_plural = _("Proveedores")
+
+
 class OrderLine(models.Model):
     order = models.ForeignKey(
         "shop.Order",