Updated snapshots -- major incompatibility with previous migrations, needs manual intervention

nummi/main/migrations/0015_alter_snapshot_options_remove_snapshot_diff_and_more.py

@@ -0,0 +1,71 @@
+# Generated by Django 4.1.4 on 2022-12-29 20:26
+
+import datetime
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("main", "0014_alter_account_icon"),
+    ]
+
+    operations = [
+        migrations.AlterModelOptions(
+            name="snapshot",
+            options={
+                "ordering": ["-date"],
+                "verbose_name": "Statement",
+                "verbose_name_plural": "Statements",
+            },
+        ),
+        migrations.RemoveField(
+            model_name="snapshot",
+            name="diff",
+        ),
+        migrations.RemoveField(
+            model_name="snapshot",
+            name="previous",
+        ),
+        migrations.AddField(
+            model_name="snapshot",
+            name="start_date",
+            field=models.DateField(
+                default=datetime.date.today, verbose_name="Start date"
+            ),
+        ),
+        migrations.AddField(
+            model_name="snapshot",
+            name="start_value",
+            field=models.DecimalField(
+                decimal_places=2, default=0, max_digits=12, verbose_name="Start value"
+            ),
+        ),
+        migrations.AddField(
+            model_name="transaction",
+            name="snapshot",
+            field=models.ForeignKey(
+                blank=True,
+                null=True,
+                on_delete=django.db.models.deletion.SET_NULL,
+                to="main.snapshot",
+                verbose_name="Statement",
+            ),
+        ),
+        migrations.AlterField(
+            model_name="snapshot",
+            name="date",
+            field=models.DateField(
+                default=datetime.date.today, verbose_name="End date"
+            ),
+        ),
+        migrations.AlterField(
+            model_name="snapshot",
+            name="value",
+            field=models.DecimalField(
+                decimal_places=2, default=0, max_digits=12, verbose_name="End value"
+            ),
+        ),
+    ]

nummi/main/migrations/0016_alter_transaction_account_alter_transaction_snapshot.py

@@ -0,0 +1,35 @@
+# Generated by Django 4.1.4 on 2022-12-29 20:32
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("main", "0015_alter_snapshot_options_remove_snapshot_diff_and_more"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="transaction",
+            name="account",
+            field=models.ForeignKey(
+                blank=True,
+                editable=False,
+                null=True,
+                on_delete=django.db.models.deletion.SET_NULL,
+                to="main.account",
+                verbose_name="Account",
+            ),
+        ),
+        migrations.AlterField(
+            model_name="transaction",
+            name="snapshot",
+            field=models.ForeignKey(
+                on_delete=django.db.models.deletion.CASCADE,
+                to="main.snapshot",
+                verbose_name="Statement",
+            ),
+        ),
+    ]

nummi/main/migrations/0017_alter_transaction_account.py

@@ -0,0 +1,24 @@
+# Generated by Django 4.1.4 on 2022-12-29 20:34
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("main", "0016_alter_transaction_account_alter_transaction_snapshot"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="transaction",
+            name="account",
+            field=models.ForeignKey(
+                editable=False,
+                on_delete=django.db.models.deletion.CASCADE,
+                to="main.account",
+                verbose_name="Account",
+            ),
+        ),
+    ]

nummi/main/models.py

@@ -1,6 +1,6 @@
+import datetime
 import pathlib
 import uuid
-from datetime import date
 
 from django.conf import settings
 from django.core.validators import FileExtensionValidator
@@ -101,7 +101,77 @@ class Category(CustomModel):
         verbose_name_plural = _("Categories")
 
 
-class Transaction(AccountModel):
+def snapshot_path(instance, filename):
+    return pathlib.Path("snapshots", str(instance.id)).with_suffix(".pdf")
+
+
+class Snapshot(AccountModel):
+    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
+    date = models.DateField(default=datetime.date.today, verbose_name=_("End date"))
+    start_date = models.DateField(
+        default=datetime.date.today, verbose_name=_("Start date")
+    )
+    value = models.DecimalField(
+        max_digits=12, decimal_places=2, default=0, verbose_name=_("End value")
+    )
+    start_value = models.DecimalField(
+        max_digits=12, decimal_places=2, default=0, verbose_name=_("Start value")
+    )
+    file = models.FileField(
+        upload_to=snapshot_path,
+        validators=[FileExtensionValidator(["pdf"])],
+        verbose_name=_("File"),
+        max_length=256,
+        blank=True,
+        default="",
+    )
+
+    def __str__(self):
+        return _("%(date)s statement") % {"date": self.date}
+
+    def save(self, *args, **kwargs):
+        if Snapshot.objects.filter(id=self.id).exists():
+            _prever = Snapshot.objects.get(id=self.id)
+            if _prever.file and _prever.file != self.file:
+                pathlib.Path(_prever.file.path).unlink(missing_ok=True)
+
+        super().save(*args, **kwargs)
+
+    def delete(self, *args, only_super=False, **kwargs):
+        if self.file:
+            self.file.delete()
+
+    def get_absolute_url(self):
+        return reverse("snapshot", kwargs={"pk": self.pk})
+
+    def get_delete_url(self):
+        return reverse("del_snapshot", kwargs={"pk": self.pk})
+
+    @property
+    def pos(self):
+        return (
+            self.transactions.filter(value__gt=0).aggregate(sum=models.Sum("value"))[
+                "sum"
+            ]
+            or 0
+        )
+
+    @property
+    def neg(self):
+        return (
+            self.transactions.filter(value__lt=0).aggregate(sum=models.Sum("value"))[
+                "sum"
+            ]
+            or 0
+        )
+
+    class Meta:
+        ordering = ["-date"]
+        verbose_name = _("Statement")
+        verbose_name_plural = _("Statements")
+
+
+class Transaction(CustomModel):
     id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
     name = models.CharField(
         max_length=256, default=_("Transaction"), verbose_name=_("Name")
@@ -110,7 +180,7 @@ class Transaction(AccountModel):
     value = models.DecimalField(
         max_digits=12, decimal_places=2, default=0, verbose_name=_("Value")
     )
-    date = models.DateField(default=date.today, verbose_name=_("Date"))
+    date = models.DateField(default=datetime.date.today, verbose_name=_("Date"))
     real_date = models.DateField(blank=True, null=True, verbose_name=_("Real date"))
     trader = models.CharField(
         max_length=128, blank=True, null=True, verbose_name=_("Trader")
@@ -125,6 +195,21 @@ class Transaction(AccountModel):
         null=True,
         verbose_name=_("Category"),
     )
+    snapshot = models.ForeignKey(
+        Snapshot,
+        on_delete=models.CASCADE,
+        verbose_name=_("Statement"),
+    )
+    account = models.ForeignKey(
+        Account,
+        on_delete=models.CASCADE,
+        verbose_name=_("Account"),
+        editable=False,
+    )
+
+    def save(self, *args, **kwargs):
+        self.account = self.snapshot.account
+        super().save(*args, **kwargs)
 
     def __str__(self):
         return f"{self.date} – {self.name}"
@@ -192,146 +277,6 @@ class Invoice(CustomModel):
         verbose_name_plural = _("Invoices")
 
 
-def snapshot_path(instance, filename):
-    return pathlib.Path("snapshots", str(instance.id)).with_suffix(".pdf")
-
-
-class Snapshot(AccountModel):
-    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
-    date = models.DateField(default=date.today, verbose_name=_("Date"))
-    value = models.DecimalField(
-        max_digits=12, decimal_places=2, default=0, verbose_name=_("Value")
-    )
-    previous = models.OneToOneField(
-        "self", on_delete=models.SET_NULL, blank=True, null=True, editable=False
-    )
-    diff = models.DecimalField(
-        max_digits=12, decimal_places=2, editable=False, blank=True, null=True
-    )
-    file = models.FileField(
-        upload_to=snapshot_path,
-        validators=[FileExtensionValidator(["pdf"])],
-        verbose_name=_("File"),
-        max_length=256,
-        blank=True,
-        default="",
-    )
-
-    def __str__(self):
-        return _("%(date)s snapshot") % {"date": self.date}
-
-    def save(self, *args, only_super=False, **kwargs):
-        if not only_super:
-            if Snapshot.objects.filter(id=self.id).exists():
-                _prever = Snapshot.objects.get(id=self.id)
-                if _prever.file and _prever.file != self.file:
-                    pathlib.Path(_prever.file.path).unlink(missing_ok=True)
-
-            _prev = (
-                self.__class__.objects.order_by("-date")
-                .exclude(id=self.id)
-                .filter(date__lt=self.date)
-                .first()
-            )
-
-            try:
-                _next = self.__class__.objects.exclude(id=self.id).get(previous=_prev)
-            except self.__class__.DoesNotExist:
-                pass
-            else:
-                try:
-                    _prevnext = self.__class__.objects.exclude(id=self.id).get(
-                        previous=self
-                    )
-                except self.__class__.DoesNotExist:
-                    pass
-                else:
-                    _prevnext.previous = (
-                        self.__class__.objects.order_by("-date")
-                        .exclude(id=self.id)
-                        .filter(date__lt=_prevnext.date)
-                        .first()
-                    )
-                    _prevnext.save(only_super=True)
-                _next.previous = None
-                super().save(*args, **kwargs)
-                _next.previous = self
-                _next.save(only_super=True)
-
-            self.previous = _prev
-
-        if self.previous is None:
-            self.diff = None
-        else:
-            self.diff = self.value - self.previous.value
-        super().save(*args, **kwargs)
-
-        try:
-            _next = self.__class__.objects.get(previous=self)
-        except self.__class__.DoesNotExist:
-            pass
-        else:
-            _next.save(only_super=True)
-
-    def delete(self, *args, only_super=False, **kwargs):
-        self.file.delete()
-        if not only_super:
-            try:
-                _next = self.__class__.objects.get(previous=self)
-            except self.__class__.DoesNotExist:
-                super().delete(*args, **kwargs)
-            else:
-                _next.previous = self.previous
-                super().delete(*args, **kwargs)
-                _next.save(only_super=True)
-        else:
-            super().delete(*args, **kwargs)
-
-    def get_absolute_url(self):
-        return reverse("snapshot", kwargs={"pk": self.pk})
-
-    def get_delete_url(self):
-        return reverse("del_snapshot", kwargs={"pk": self.pk})
-
-    @property
-    def sum(self):
-        if self.previous is None:
-            return 0
-        trans = self.transactions.aggregate(sum=models.Sum("value"))
-        return trans["sum"] or 0
-
-    @property
-    def transactions(self):
-        if self.previous is None:
-            return Transaction.objects.none()
-        return Transaction.objects.filter(
-            date__lte=self.date, date__gt=self.previous.date
-        )
-
-    @property
-    def pos(self):
-        return (
-            self.transactions.filter(value__gt=0).aggregate(sum=models.Sum("value"))[
-                "sum"
-            ]
-            or 0
-        )
-
-    @property
-    def neg(self):
-        return (
-            self.transactions.filter(value__lt=0).aggregate(sum=models.Sum("value"))[
-                "sum"
-            ]
-            or 0
-        )
-
-    class Meta:
-        ordering = ["-date"]
-        verbose_name = _("Snapshot")
-        verbose_name_plural = _("Snapshots")
-
-
 class NummiForm(ModelForm):
     template_name = "main/form/base.html"
 
@@ -361,7 +306,7 @@ class TransactionForm(NummiForm):
         _user = kwargs.pop("user")
         super().__init__(*args, **kwargs)
         self.fields["category"].queryset = Category.objects.filter(user=_user)
-        self.fields["account"].queryset = Account.objects.filter(user=_user)
+        self.fields["snapshot"].queryset = Snapshot.objects.filter(user=_user)
 
 
 class InvoiceForm(NummiForm):