coin/coin/billing/models.py

from django.db import models


class InvoceDetail(models.Model):

    label = models.CharField(max_length=100)
    amount = models.DecimalField(max_digits=5, decimal_places=2)
    quantity = models.IntegerField(null=True)
    tax = models.IntegerField(null=True)

    def __unicode__(self):
        return self.label


class Invoce(models.Model):

    INVOICES_STATUS_CHOICES = (
        ('open', 'A payer'),
        ('Closed', 'Reglée'),
        ('trouble', 'Litige')
    )

    status = models.CharField(max_length=50, choices=INVOICES_STATUS_CHOICES,
                              default='open')
    detail = models.ForeignKey(Invoces_Detail)
    amount = models.DecimalField(max_digits=5, decimal_places=2)
    date = models.DateField(auto_now_add=True, null=True)
    period_from = models.DateField(auto_now_add=False, null=True)
    period_to = models.DateField(auto_now_add=False, null=True)
    date_due = models.DateField(auto_now_add=False, null=True)


class Payment(models.Model):
    payment_means = models.CharField(max_length=100, null=True)
    amount = models.DecimalField(max_digits=7, decimal_places=2, null=True)
    date = models.DateField(auto_now_add=True)
    invoce = models.ForeignKey(Invoces)