price = 1 (if there are more recent transactions)

[vorburger]

Disclaimer: I'm fairly new to Beancount & Fava.

I ran into something weird related to prices in Fava which I thought would be worth reporting here:

Looking at Fava's /commodities/ page for my Ledger, I had some CHF / USD at 1.1x and all USD / CHF at 1.

That... doesn't really make sense, and should be "impossible" - do you agree? I spent some time narrowing it down to a minimal reproducer:

option "operating_currency" "CHF"
option "operating_currency" "USD"

1850-07-01 commodity CHF
1792-04-02 commodity USD

2020-12-18 price USD 0.88 CHF
2022-12-19 price USD 0.9288 CHF

2021-11-12 open Assets:A CHF
2019-05-01 open Assets:B CHF

2022-12-19 *
    Assets:A  1 CHF
    Assets:B

2022-12-27 *
    Assets:A  1 CHF
    Assets:B

This will show the correct CHF / USD, calculated from the inverse of the price given above:

Date	Price
2020-12-18	1.14
2022-12-19	1.08

But the USD / CHF shown is clearly wrong, ignoring the price directives:

Date	Price
2020-12-18	1
2022-12-19	1

Adding a price for the day of the last transaction on 2022-12-27 (which only uses CHF no USD...) "fixes" it:

2022-12-27 price USD 0.9294 CHF

now the USD / CHF table is correct:

Date	Price
2020-12-18	0.8800
2022-12-19	0.9288
2022-12-27	0.9294

[yagebu]

Hi, thank you for opening this issue. In the context of reworking the price logic in Fava (#1589), I've had a look into this. The prices are calculated correctly in Fava, but they are rounded when displayed, since you've only got amounts in the CHF currency that lack any digits after the decimal dot - so the decimal precision with which to display amounts in CHF is inferred to be zero.