Bug 103181: not-monthly repayment schedules not supported in Mortgage/Loan Druid

[David]

Alessandro,

As a longtime user, I can tell you that there will be a huge cry of thanks from the user base if you can get the mortgage calculator working better. I know I am not the only user who has either abandoned the scheduled mortgage payment altogether, or who has to change every created transaction after the fact because the calf's are off.

I would ask you to consider checking first on whether you can create a "balance as of date" function, as it seems many mortgage complaints originate from the fact that GnuCash can't do this. With such a function, users would be able to prepayment their loans and GnuCash would still be able to calculate and allocate correctly -- something it cannot currently do.

I've been told this would be complicated, but I toss it out with hope...

David



_____________________________________________
From: John Ralls <jralls at ceridwen.us>
Sent: Tue Jan 14 06:57:59 PST 2014
To: alessandro basili <alessandro.basili at cern.ch>
Cc: GnuCash development list <gnucash-devel at gnucash.org>
Subject: Re: Bug 103181: not-monthly repayment schedules not supported in Mortgage/Loan Druid



On Jan 14, 2014, at 5:22 AM, alessandro basili <alessandro.basili at cern.ch> wrote:

> Hi John,
> 
> On 1/13/2014 5:46 PM, John Ralls wrote:
> [...]
>> We're not terribly concerned about API changes, especially in the
>> gnome and gnome-utils directories. Just make sure that if you do
>> change a function's signature that you check for and fix both C and
>> Scheme callers.
> 
> I do not know Scheme (shame on me! :-)) but I guess checking for the
> call wouldn't be an issue.

So many languages, so little time. ;-)
The function names are the same as the C ones except that words are separated wit '-' instead of '_'.

> 
>> We also need to separate the computations from the
>> GUI code in those directories. You don't have to do that yourself,
>> but please keep the goal in mind. 
> 
> I'm afraid I haven't fully understood this point. Could you elaborate?

http://en.wikipedia.org/wiki/Model_view_controller

Most current GnuCash code does not separate the controller and view code. We need to fix that.

> 
>> If you can, please add unit tests
>> to any functions you alter significantly.
> 
> I would follow recommendations and already existing examples in order to
> provide some level of testing.

The existing examples aren't all that good, especially outside of src/engine and src/libqof/qof.

Regards,
John Ralls


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