Invoicing: Allow to show exchange rates based on sources/rules (#3122)

src/pretix/base/models/__init__.py

@@ -23,6 +23,7 @@ from ..settings import GlobalSettingsObject_SettingsStore
 from .auth import U2FDevice, User, WebAuthnDevice
 from .base import CachedFile, LoggedModel, cachedfile_name
 from .checkin import Checkin, CheckinList
+from .currencies import ExchangeRate
 from .customers import Customer
 from .devices import Device, Gate
 from .discount import Discount

src/pretix/base/models/currencies.py

@@ -0,0 +1,34 @@
+#
+# This file is part of pretix (Community Edition).
+#
+# Copyright (C) 2014-2020 Raphael Michel and contributors
+# Copyright (C) 2020-2021 rami.io GmbH and contributors
+#
+# This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General
+# Public License as published by the Free Software Foundation in version 3 of the License.
+#
+# ADDITIONAL TERMS APPLY: Pursuant to Section 7 of the GNU Affero General Public License, additional terms are
+# applicable granting you additional permissions and placing additional restrictions on your usage of this software.
+# Please refer to the pretix LICENSE file to obtain the full terms applicable to this work. If you did not receive
+# this file, see <https://pretix.eu/about/en/license>.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
+# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Affero General Public License along with this program.  If not, see
+# <https://www.gnu.org/licenses/>.
+#
+from django.db import models
+
+
+class ExchangeRate(models.Model):
+    source = models.CharField(max_length=100)
+    source_date = models.DateField()
+    updated = models.DateTimeField(auto_now=True)
+    source_currency = models.CharField(max_length=3)
+    other_currency = models.CharField(max_length=3)
+    rate = models.DecimalField(decimal_places=6, max_digits=16)
+
+    class Meta:
+        unique_together = (('source', 'source_currency', 'other_currency'))

src/pretix/base/models/invoices.py

@@ -105,6 +105,8 @@ class Invoice(models.Model):
     :type foreign_currency_rate: Decimal
     :param foreign_currency_rate_date: The date of the foreign currency exchange rates.
     :type foreign_currency_rate_date: date
+    :param foreign_currency_rate_source: The source of the foreign currency rate.
+    :type foreign_currency_rate_source: str
     :param file: The filename of the rendered invoice
     :type file: File
     """
@@ -152,6 +154,7 @@ class Invoice(models.Model):
     foreign_currency_display = models.CharField(max_length=50, null=True, blank=True)
     foreign_currency_rate = models.DecimalField(decimal_places=4, max_digits=10, null=True, blank=True)
     foreign_currency_rate_date = models.DateField(null=True, blank=True)
+    foreign_currency_source = models.CharField(max_length=100, null=True, blank=True)
 
     shredded = models.BooleanField(default=False)