Automatically link SpecialTransactions and their proxies

apps/treasury/apps.py

@@ -2,9 +2,24 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 from django.apps import AppConfig
+from django.db.models.signals import post_save
 from django.utils.translation import gettext_lazy as _
 
 
 class TreasuryConfig(AppConfig):
     name = 'treasury'
     verbose_name = _('Treasury')
+
+    def ready(self):
+        """
+        Define app internal signals to interact with other apps
+        """
+
+        from . import signals
+        from note.models import SpecialTransaction
+        from treasury.models import SpecialTransactionProxy
+        post_save.connect(signals.save_special_transaction, sender=SpecialTransaction)
+
+        # If the treasury app was disabled, we ensure that each special transaction is linked to a proxy
+        for transaction in SpecialTransaction.objects.filter(specialtransactionproxy=None):
+            SpecialTransactionProxy.objects.create(transaction=transaction, remittance=None)