feat(dca): limit create-transaction accounts to the strategy currencies

app/apps/dca/forms.py

@@ -250,6 +250,7 @@ class DCAEntryForm(forms.ModelForm):
 
         self.fields["from_account"].queryset = Account.objects.filter(
             is_archived=False,
+            currency=self.strategy.payment_currency,
         )
 
         self.fields["from_category"].queryset = TransactionCategory.objects.filter(
@@ -259,6 +260,7 @@ class DCAEntryForm(forms.ModelForm):
 
         self.fields["to_account"].queryset = Account.objects.filter(
             is_archived=False,
+            currency=self.strategy.target_currency,
         )
 
         self.fields["to_category"].queryset = TransactionCategory.objects.filter(

app/apps/dca/tests/test_transfer_linking.py

@@ -150,3 +150,17 @@ class DCATransferLinkingTests(TestCase):
         entry = form.save()
         self.assertEqual(list(entry.expense_transaction.entities.all()), [broker])
         self.assertEqual(list(entry.income_transaction.entities.all()), [broker])
+
+    def test_create_accounts_must_hold_strategy_currency(self):
+        # Swapped: paying from the BTC wallet into the BRL cash account
+        form = DCAEntryForm(
+            data=self.entry_data(
+                create_transaction="on",
+                from_account=self.wallet.id,
+                to_account=self.cash.id,
+            ),
+            strategy=self.strategy,
+        )
+        self.assertFalse(form.is_valid())
+        self.assertIn("from_account", form.errors)
+        self.assertIn("to_account", form.errors)