def _filter_already_processed_ledgers(form, ledgers):
"""Remove any ledgers that already have a ledger transaction for this form"""
ledgers_by_id = {ledger.ledger_reference: ledger for ledger in ledgers}
case_ids = [ledger.case_id for ledger in ledgers]
for trans in LedgerAccessorSQL.get_ledger_transactions_for_form(
form.form_id, case_ids):
del ledgers_by_id[trans.ledger_reference]
return ledgers_by_id.values()
