With the following simplified setup I receive the following error:
FlushError: instance <erp.model.financial.TransactionOffset object at
0x0203CC90> is an unsaved, pending instance and is an orphan (is not
attached to any parent 'Transaction' instance via that classes'
'offsets' attribute)
When attempting something along the lines of
transactions = Transaction.query.all()
offset = TransactionOffset()
offset.transaction = transactions[4]
offset.offset_transaction = transactions[5]
meta.Session.commit()
However, if I append offset to transactions[4].offsets it will save
transaction_id, but not offset_transaction_id
Classes:
class Transaction(Entity):
pass
class TransactionOffset(Entity):
pass
Tables:
transactions = Table('transactions', meta,
Column('id', Integer, primary_key=True),
Column('date', Date),
Column('description', Text),
Column('amount', Float),
Column('transaction_code', String(50)),
Column('approval_code', String(50)),
Column('voided_at', DateTime),
)
transaction_offsets = Table('transaction_offsets', meta,
Column('id', Integer, primary_key=True),
Column('amount', Float),
Column('transaction_id', Integer),
Column('offset_transaction_id', Integer),
ForeignKeyConstraint(['transaction_id'], ['transactions.id']),
ForeignKeyConstraint(['offset_transaction_id'],
['transactions.id']),
)
Mappers:
transactions_mapper = mapper(Transaction, transactions, properties={
'offsets': relation(TransactionOffset,
primaryjoin=transaction_offsets.c.transaction_id==transactions.c.id,
cascade='all, delete-
orphan'),
})
mapper(TransactionOffset, transaction_offsets, properties={
'transaction': relation(Transaction,
primaryjoin=transaction_offsets.c.transaction_id==transactions.c.id,
post_update=True),
'offset_transaction': relation(Transaction,
primaryjoin=transaction_offsets.c.offset_transaction_id==transactions.c.id,
post_update=True),
})
-brad
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