Add Currency model

src/apps/banking/admin/__init__.py

@@ -0,0 +1,5 @@
+from apps.banking.admin.currency_rate import CurrencyRateAdmin
+
+__all__ = [
+    "CurrencyRateAdmin",
+]

src/apps/banking/admin/currency_rate.py

@@ -0,0 +1,31 @@
+from django.contrib.admin.models import CHANGE, LogEntry
+from django.http import HttpRequest
+from traitlets import Any
+
+from apps.banking.models import CurrencyRate
+from core.admin import ModelAdmin, admin
+from core.tasks import write_admin_log
+
+
+@admin.register(CurrencyRate)
+class CurrencyRateAdmin(ModelAdmin):
+    list_display = ["name", "rate"]
+
+    def get_object(self, request: HttpRequest, object_id: str, from_field: str | None = None) -> CurrencyRate | None:
+        obj = super().get_object(request, object_id, from_field)
+        if obj:
+            obj.__original_rate = obj.rate
+        return obj
+
+    def log_change(self, request: HttpRequest, obj: CurrencyRate, message: Any) -> LogEntry:
+        if obj.rate != obj.__original_rate:  # type: ignore[attr-defined]
+            return write_admin_log(
+                action_flag=CHANGE,
+                app="banking",
+                change_message=f"Currency rate was changed from {obj.__original_rate} to {obj.rate}",  # type: ignore[attr-defined]
+                model="CurrencyRate",
+                object_id=obj.id,
+                user_id=request.user.id,
+            )
+        else:
+            return super().log_change(request, obj, message)

src/apps/banking/migrations/0003_initial.py

@@ -0,0 +1,29 @@
+# Generated by Django 4.2.17 on 2024-12-24 10:08
+
+from django.db import migrations, models
+
+import core.models
+
+
+class Migration(migrations.Migration):
+    initial = True
+
+    dependencies = [
+        ("banking", "0002_drop_recipient_model"),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name="CurrencyRate",
+            fields=[
+                ("id", models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name="ID")),
+                ("name", models.CharField(help_text="Currency name in ISO 4217 format. E.g. USD", max_length=4, unique=True)),
+                ("rate", models.DecimalField(decimal_places=2, max_digits=6, verbose_name="Rate")),
+            ],
+            options={
+                "verbose_name": "Currency",
+                "verbose_name_plural": "Currencies",
+            },
+            bases=(core.models.TestUtilsMixin, models.Model),
+        ),
+    ]

src/apps/banking/models.py

@@ -0,0 +1,13 @@
+from django.db import models
+from django.utils.translation import gettext_lazy as _
+
+from core.models import DefaultModel
+
+
+class CurrencyRate(DefaultModel):
+    name = models.CharField(max_length=4, unique=True, help_text=_("Currency name in ISO 4217 format. E.g. USD"))
+    rate = models.DecimalField(max_digits=6, decimal_places=2, verbose_name=_("Rate"))
+
+    class Meta:
+        verbose_name = _("Currency")
+        verbose_name_plural = _("Currencies")

src/apps/orders/migrations/0039_alter_order_ue_rate.py

@@ -0,0 +1,17 @@
+# Generated by Django 4.2.17 on 2024-12-24 11:29
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("orders", "0038_alter_order_bank_id_alter_refund_bank_id"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="order",
+            name="ue_rate",
+            field=models.DecimalField(decimal_places=2, max_digits=6, verbose_name="Purchase-time UE rate"),
+        ),
+    ]

src/apps/orders/models/order.py

@@ -53,7 +53,7 @@ class Order(TimestampedModel):
     shipped = models.DateTimeField(_("Date when order was shipped"), null=True, blank=True)
 
     bank_id = models.CharField(_("User-requested bank string"), choices=BANK_CHOICES, blank=True, max_length=32)
-    ue_rate = models.IntegerField(_("Purchase-time UE rate"))
+    ue_rate = models.DecimalField(_("Purchase-time UE rate"), decimal_places=2, max_digits=6)
     acquiring_percent = models.DecimalField(default=0, max_digits=4, decimal_places=2)
 
     course = ItemField(to="products.Course", verbose_name=_("Course"), null=True, blank=True, on_delete=models.PROTECT)

src/locale/ru/LC_MESSAGES/django.po

@@ -967,6 +967,22 @@ msgstr "Да"
 msgid "No"
 msgstr "Нет"
 
+#: apps/banking/models.py:7
+msgid "Currency name in ISO 4217 format. E.g. USD"
+msgstr "Код валюты по ISO 4217. Например, USD"
+
+#: apps/banking/models.py:8
+msgid "Rate"
+msgstr "Курс"
+
+#: apps/banking/models.py:11
+msgid "Currency"
+msgstr "Курс валюты"
+
+#: apps/banking/models.py:12
+msgid "Currencies"
+msgstr "Курсы валют"
+
 #, python-brace-format
 #~ msgid ""
 #~ "Orders {non_refunded_orders_as_message} have not been refunded. Up to 5 "