gva/gnuviechadmin/invoices/models.py

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import magic
from django.conf import settings
from django.core.exceptions import ValidationError
from django.core.validators import FileExtensionValidator
from django.db import models
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from django.utils.translation import gettext_lazy as _
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CURRENCIES = [(1, "EUR")]
def customer_invoice_path(instance, filename):
return "invoices/{0}/{1}.pdf".format(
instance.customer.username, instance.invoice_number
)
def validate_pdf(value):
valid_mime_types = ["application/pdf"]
file_mime_type = magic.from_buffer(value.read(1024), mime=True)
if file_mime_type not in valid_mime_types:
raise ValidationError("Unsupported file type.")
class Invoice(models.Model):
customer = models.ForeignKey(
settings.AUTH_USER_MODEL, verbose_name=_("customer"), on_delete=models.CASCADE
)
invoice = models.FileField(
upload_to=customer_invoice_path,
validators=[validate_pdf, FileExtensionValidator(allowed_extensions=["pdf"])],
)
invoice_number = models.SlugField(
verbose_name=_("invoice number"), max_length=10, unique=True
)
invoice_date = models.DateField(verbose_name=_("invoice date"))
invoice_value = models.DecimalField(
verbose_name=_("amount"), decimal_places=2, max_digits=10
)
invoice_currency = models.PositiveSmallIntegerField(
verbose_name=_("currency"), choices=CURRENCIES
)
due_date = models.DateField(verbose_name=_("due date"))
payment_date = models.DateField(
verbose_name=_("payment date"), blank=True, null=True
)
payment_variant = models.TextField(
verbose_name=_("payment variant"), blank=True, null=True
)
class Meta:
verbose_name = _("invoice")
verbose_name_plural = _("invoices")
ordering = ["-invoice_date", "customer"]
def __str__(self):
return _("Invoice {0}").format(self.invoice_number)