expephalon/core/models/invoices.py

from django.db.models import Model, ForeignKey, CASCADE, PositiveIntegerField, TextField, BooleanField, DateField, SET_NULL, PROTECT, ManyToManyField

from core.fields.base import LongCharField
from core.fields.numbers import CostField
from core.models.profiles import ClientProfile
from core.models.local import Currency
from core.models.brands import Brand
from core.models.billable import BaseBillable
from core.models.products import ProductGroup

class Invoice(Model):
    client = ForeignKey(ClientProfile, on_delete=PROTECT)
    brand = ForeignKey(Brand, on_delete=PROTECT)
    number = LongCharField()
    created = DateField()
    due = DateField()
    payment_method = LongCharField()
    currency = ForeignKey(Currency, on_delete=PROTECT)

class InvoiceItem(Model):
    invoice = ForeignKey(Invoice, on_delete=CASCADE)
    sort = PositiveIntegerField()
    name = LongCharField()
    description = TextField(blank=True, null=True)
    product_groups = ManyToManyField(ProductGroup)
    price = CostField()
    discount = CostField()
    taxable = BooleanField()
    billable = ForeignKey(BaseBillable, on_delete=SET_NULL, null=True)