Not so atomic, sorry

note/models/transactions.py

@@ -0,0 +1,76 @@
+# -*- mode: python; coding: utf-8 -*-
+# Copyright (C) 2018-2019 by BDE ENS Paris-Saclay
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+from django.db import models
+from django.utils import timezone
+from django.utils.translation import gettext_lazy as _
+
+from .notes import Note
+
+"""
+Defines transactions
+"""
+
+
+class TransactionTemplate(models.Model):
+    name = models.CharField(
+        verbose_name=_('name'),
+        max_length=255,
+    )
+    destination = models.ForeignKey(
+        Note,
+        on_delete=models.PROTECT,
+        related_name='+',  # no reverse
+        verbose_name=_('destination'),
+    )
+    amount = models.PositiveIntegerField(
+        verbose_name=_('amount'),
+    )
+    template_type = models.CharField(
+        verbose_name=_('type'),
+        max_length=31
+    )
+
+
+class Transaction(models.Model):
+    source = models.ForeignKey(
+        Note,
+        on_delete=models.PROTECT,
+        related_name='+',
+        verbose_name=_('source'),
+    )
+    destination = models.ForeignKey(
+        Note,
+        on_delete=models.PROTECT,
+        related_name='+',
+        verbose_name=_('destination'),
+    )
+    datetime = models.DateTimeField(
+        verbose_name=_('destination'),
+        default=timezone.now,
+    )
+    quantity = models.PositiveSmallIntegerField(
+        verbose_name=_('quantity'),
+    )
+    amount = models.PositiveIntegerField(
+        verbose_name=_('amount'),
+    )
+    transaction_type = models.CharField(
+        verbose_name=_('type'),
+        max_length=31,
+    )
+    description = models.TextField(
+        verbose_name=_('description'),
+    )
+    valid = models.NullBooleanField(
+        verbose_name=_('valid'),
+    )
+
+
+class MembershipTransaction(Transaction):
+    membership = models.OneToOneField(
+        'member.Membership',
+        on_delete=models.PROTECT,
+        related_name='transaction',
+    )