https://bugs.kde.org/show_bug.cgi?id=386606
Bug ID: 386606
Summary: tags search is broken after moving tags (invalid
lft/rgt columns)
Product: digikam
Version: 5.6.0
Platform: openSUSE RPMs
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: Database-Mysql
Assignee: digikam-bugs-n...@kde.org
Reporter: k...@forum.titlis.org
Target Milestone: ---
The modified preorder tree traversal fields Tags.lft & Tags.rgt become invalid
when you move a tag in the tags hierarchy.
Example: assume the 4 tags Monkey, Lifesaver, blue, red with the following
hierarchy
- Monkey
- Lifesaver -> blue
- Lifesaver -> red
When you select the tag "Lifesaver", all pictures with the tags blue and red
show up. Now you move tag "blue" to the tag root, such that you have the
following hierarchy
- Monkey
- blue
- Lifesaver -> red
When you select the tag "Lifesaver", also the picture with tag "blue" is
selected, which is a bug
The example above is used in the script digikam_with_sample_db from
https://github.com/githubkusi/digikam_controlled_environment. The repo contains
some handy tools for database investigations in a controlled, repeatable
environment
The reason for the bug are invalid columns Tags.lft/rgt. These columns are not
set correctly when moving tags (maybe there are other problematic situations).
looking at current master, I see that there is a move_tagstree for sqlite, but
not for mysql in the file dbconfig.xml.cmake.in. This is probably the issue.
Anyways, adding mysql support for moving tags wouldn't heal an already broken
mysql db. I assume that basically everybody using a mysql backend for a few
years has a broken tags search functionality by now, which can only be solved
by recalculating the lft/rgt fields from scratch. I've written a script which
recalculates proper traversal tree columns and works with the example above
https://github.com/githubkusi/digikam_rebuild_mptt
The code is not yet bullet-proof (no db locking during the fix, no sanity
checks), but something like this should go into the db maintenance tools.
The issue was already reported here:
https://bugs.kde.org/show_bug.cgi?id=338050
which was fixed in 5.1. However, the issue is still present in 5.6 for me.
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