gristlabs_grist-core/sandbox
Alex Hall 56624c4a95 (core) Fix undo error for automatically removed rows, especially in summary tables
Summary:
Fixes a bug noted here: https://grist.slack.com/archives/C069RUP71/p1662564341132349

This bug could happen quite easily as follows:

1. Have a formula in a summary table such as `$group.amount`. Typically there's also a `SUM` but that's not essential.
2. Find a group with nonzero values of `amount`.
3. Delete all rows in that group in the source table. Typically that just means one row in a lonely group.
4. The summary table row is automatically deleted.
5. Try to undo. This raises an error about trying to update a non-existent summary table row.

I tried to account for this undo problem in https://phab.getgrist.com/D3489 by not saving the updated value for `$group` when it was found to be empty. The reason this was insufficient is that `$group.amount` is immediately invalidated anyway when the source row(s) are deleted (I think because that's just how dependency relations involving references work) *and* the calculated value of `$group.amount` changes even if `$group` doesn't. For example, `$group.amount` may have previously been `[100, 200]`. After deleting the rows, `$group.amount` becomes `[0, 0]`. Keeping `$group` unchanged prevents `$group.amount` from just being `[]`, but deleting the source rows means that the amounts become the numeric default `0` which is still a change. This change in value is then noted which leads to saving an undo action to update the summary table record. All this happens in step 3 above, and the summary record is only deleted after that point.

This diff removes that special handling for `group` and instead adds a more general fix to `action_summary.py`. This inserts undo actions for deleted rows at the beginning of the undo list rather than at the end, which was already done for deleted tables and columns.

Test Plan: Python tests

Reviewers: dsagal

Reviewed By: dsagal

Subscribers: dsagal

Differential Revision: https://phab.getgrist.com/D3626
2022-09-09 22:15:45 +02:00
..
docker (core) support python3 in grist-core, and running engine via docker and/or gvisor 2021-07-28 09:02:32 -04:00
grist (core) Fix undo error for automatically removed rows, especially in summary tables 2022-09-09 22:15:45 +02:00
gvisor (core) add GVISOR_LIMIT_MEMORY to cap memory available in sandbox 2022-05-18 14:26:27 -04:00
gen_js_schema.py (core) Use GristObjCode in CellValue 2021-10-11 14:11:32 +02:00
install_tz.js (core) apply some dependabot suggestions 2022-09-07 14:15:34 -04:00
requirements3.txt (core) Run and test imports only in Python 3, upgrade openpyxl, fix weird date handling 2022-09-02 16:27:34 +02:00
requirements.txt (core) Run and test imports only in Python 3, upgrade openpyxl, fix weird date handling 2022-09-02 16:27:34 +02:00
run.sh (core) add machinery for self-managed flavor of Grist 2022-05-12 12:39:52 -04:00
watch.sh remove watch flag no longer available under newer webpack (#229) 2022-07-28 13:07:58 -04:00