Its confusing that you can find transactions that aren't in any category

[intiocean]

I realise this is an artefact of the way the data is structured but it would be good to have a note in the docs to make people aware of this. IMHO it would be even nicer if when iterating over transactions in a category (or even always) the sub-transactions relevant to said category also appeared in the list just as any other normal transaction.

>>> t = budget.transactions.filter('date', date(2014, 10, 28))[-2]
>>> # t in this case is a transaction with sub transactions (in my budget file)

>>> # t is not in any of the transactions when iterating by category
>>> print any([t in c.transactions for c in budget.categories])
False

>>> print t.category
None

>>> print len(t.sub_transactions)
7