This isn't a direct answer to your question, but this is how I do these
kind of balance checks:
2017/01/01 * Opening Balance
Assets:Checking $1000
Equity:Opening
2017/01/02 * Savings
Assets:Savings $100
Assets:Checking
2017/01/03 * Reconcile
[Assets:Checking] $0 = $900
[Assets:Savings] $0 = $100
2017/01/04 * Savings
Assets:Savings $100
Assets:Checking
2017/01/05 * Reconcile
[Assets:Checking] $0 = $800
[Assets:Savings] $0 = $200
This works well. I read these reconcile transactions as "If $0 is added to
the account, the balance should be $800".
If I instead change the last reconcile to "[Assets:Checking] $0 = $700"
(that is, make it $100 off) I get this error:
While parsing file "/home/mythmon/tmp/foo.ledger", line 18:
While parsing posting:
[Assets:Checking] $0 = $700
^^^^
Error: Balance assertion off by $-100 (expected to see $800)
This shows me both the value I said it should be ($700), the value Ledger
says it should be ($800), and the difference ($-100). All of these end up
being very useful at different times.
I leave these in my ledger files. This gives me both a history of balances,
and also a sort of test suite. If I change the organization of my files,
change rules, or do other refactoring, these assertions give me confidence
that I didn't break anything.
-Michael Cooper
On Thu, Oct 19, 2017 at 3:43 PM John Lee <j...@pobox.com> wrote:
> An example that currently has me puzzled: the first assert below passes,
> and the second fails. I'm interested both in learning why in this
> particular case, and more important, learning how to use ledger to debug
> problems like this in general.
>
> 2017-10-01 * Opening Balance
> Assets:CurrentAccount $1000
> Equity:OpeningBalance
>
> 2017-10-02 * Savings
> Assets:CurrentAccount:Savings $100
> Assets:CurrentAccount
>
> assert account("Assets:CurrentAccount").total == $1000
>
> 2017-10-03 * Savings
> Assets:CurrentAccount:Savings $100
> Assets:CurrentAccount
>
> assert account("Assets:CurrentAccount").total == $1000
>
>
> This surprises me because if I comment that last assert out and run
> ledger b '^Assets:CurrentAccount$' I get $800, and ledger b
> '^Assets:CurrentAccount:Savings$' prints $200 -- which adds to $1000,
> and indeed ledger b '^Assets:CurrentAccount' prints $1000. Bug?? How
> can I see what ledger *thinks* the total is when it evaluates the
> assert?
>
>
> On Thu, 19 Oct 2017, at 23:13, John Lee wrote:
> > Sometimes the assert expressions I'm adding to my ledger file fail and I
> > don't immediately know why. If I have something like this:
> >
> > assert account("Assets:CurrentAccount").total == $123.45
> >
> > and I'm wrong about the total, then I'll just be told that I'm wrong,
> > and not what the correct value is. What's the easiest way to get ledger
> > to compute and print the correct value?
> >
> > Maybe there's a way to print out account values at a given point in a
> > ledger file? In particular, maybe there's a way to print the values of
> > value expressions as the ledger file is evaluated by a command like
> > balance?
> >
> > I realize it's good to be able to see what the answer is before one
> > writes it down, but sometimes it just saves time to have the computer
> > work it out so you can see quickly what you did wrong.
>
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