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Handle reversals for new imported transactions #701

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Handle reversals for new imported transactions #701

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8 changes: 7 additions & 1 deletion pycroft/lib/finance/transaction_crud.py
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Original file line number Diff line number Diff line change
Expand Up @@ -221,9 +221,15 @@ def process_transactions(
):
purpose = purpose + " EREF+" + transaction.data["end_to_end_reference"]

amount = transaction.data["amount"].amount

# Reversal ("Storno")
if "R" in transaction.data.get("status", ""):
amount = -amount

Comment on lines +224 to +229
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Instead of doing that inline, we should provide an intermediate function which turns a MT940Transaction into a BankAccountActivity. For that, it needs from transaction.data the following fields:

  • applicant_iban
  • applicant_bin
  • applicant_name
  • purpose
  • end_to_end_reference
  • amount
  • guessed_entry_date
  • date

This should be a pure function

def activiity_from_transaction_data(
    transaction_data: TDataTypedDict,
    bank_account_id: int
) -> BankAccountActivity: ...

where TDataTypedDict captures the aforementioned keys as a TypedDict.
We can then use a fixed mt940 dump of test data to check whether all the cases are handled properly without even having to touch the DB.

new_activity = BankAccountActivity(
bank_account_id=bank_account.id,
amount=transaction.data["amount"].amount,
amount=amount,
reference=purpose,
other_account_number=iban,
other_routing_number=bic,
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