Initial commit

billing/models.py

@@ -0,0 +1,47 @@
+from django.db import models
+from django.contrib.auth import get_user_model
+
+
+User = get_user_model()
+
+
+class Invoice(models.Model):
+    STATUS_UNPAID = 'unpaid'
+    STATUS_PAID = 'paid'
+    STATUS_CANCELLED = 'cancelled'
+    STATUS_CHOICES = [
+        (STATUS_UNPAID, '未支付'),
+        (STATUS_PAID, '已支付'),
+        (STATUS_CANCELLED, '已取消'),
+    ]
+
+    user = models.ForeignKey(User, on_delete=models.CASCADE, related_name='invoices')
+    period_start = models.DateField()
+    period_end = models.DateField()
+    amount_plan_total = models.DecimalField(max_digits=12, decimal_places=2, default=0)
+    amount_overage_total = models.DecimalField(max_digits=12, decimal_places=2, default=0)
+    amount_adjustment = models.DecimalField(max_digits=12, decimal_places=2, default=0)
+    amount_total = models.DecimalField(max_digits=12, decimal_places=2, default=0)
+    status = models.CharField(max_length=20, choices=STATUS_CHOICES, default=STATUS_UNPAID)
+    created_at = models.DateTimeField(auto_now_add=True)
+    paid_at = models.DateTimeField(null=True, blank=True)
+
+    class Meta:
+        verbose_name = '账单'
+        verbose_name_plural = '账单'
+        ordering = ['-period_end']
+
+
+class InvoiceItem(models.Model):
+    invoice = models.ForeignKey(Invoice, related_name='items', on_delete=models.CASCADE)
+    domain = models.ForeignKey('domains.Domain', on_delete=models.SET_NULL, null=True, blank=True)
+    description = models.CharField(max_length=200)
+    quantity = models.DecimalField(max_digits=12, decimal_places=3, default=0)  # GB
+    unit_price = models.DecimalField(max_digits=12, decimal_places=2, default=0)
+    amount = models.DecimalField(max_digits=12, decimal_places=2, default=0)
+
+    class Meta:
+        verbose_name = '账单项'
+        verbose_name_plural = '账单项'
+
+# Create your models here.