Calculating a value based on previous questions doesn't work in a field-list

[grzesiek2010]

Software and hardware versions

Collect v1.24.1 and older versions

Problem description

Calculating a value based on previous questions doesn't work in a field-list

The problem has been originally reported on the forum: https://forum.opendatakit.org/t/auto-calculate-the-total

Steps to reproduce the problem

Try the attached form:
fieldListSimpleTest.xlsx

[lognaturel]

This has been on my internal todo list for a while. I think it's probably a JavaRosa problem because it doesn't have to do specifically with field lists. See test FieldListUpdateTest.changeInValueUsedInOtherField_ShouldChangeValue.

[grzesiek2010]

I think you are more familiar with this part of code as an author of the feature but from what I know about the code I beg to differ...

Let's assume we have a form with three integer questions in field-list

1. Number 1
2. Number 2
3. Total which has calculation (Number 1 + Number 2)

If you enter a number for Number 1 (50) and then for Number 2 (60) this happens:

1. Total is calculated in javarosa properly
2. It's a filed list so you want to refresh it so:
   In Collect we get answers for current screen:
   50, 60, null (because the value has been calculated in javarosa but we don't have it on our side)
   and we save it:
   we save 50
   then 60
   and then null (clearing 110).

after saving them we try to rebuild the list but as I mentioned the value for total has been cleared.
So I think it's a problem on our side but might be wrong.

[lognaturel]

Huh. According to my notes visible_calculate.xlsx failed outside the field-list at some point as well but I can't reproduce on master so either I was wrong or something has changed. Anyway, if you see a quick fix, please go ahead and make sure to enable the existing test. If it's not quick, please leave aside for now and we can triage once the v1.25 issues are taken care of.

[lognaturel]

Duplicate of #3211