I'll just add that I have observed the same behaviour using a
GeoPackage based layer. It was during a teaching session with 10-15
students, so I can't remember exactly how and which editing tool that
was the cause of the error.
Windows 10 / QGIS 3.22.3
Med venlig hilsen / Kind regards
Bo Victor Thomsen
Den 01-04-2022 kl. 17:38 skrev Jörg Höttges via QGIS-Developer:
Hi everyone,
I'm using QGIS 3.16 to 3.22. I created a table with multipolygon
objects in a SpatiaLite database. When editing one of the polygons
there appears a warning "Die Operation würden Geometrietyp ändern"
("The operation would change geometry type") and saving of the
changings failes.
Following are the objects before and after the modification:
before editing:
wkt_geom: MultiPolygon (((379698.83699999999953434
5709466.37000000011175871, 379705.34999999997671694
5709460.93499999959021807, 379703.7970000000204891
5709459.07600000035017729, 379697.34799999999813735
5709464.77400000020861626, 379698.83699999999953434
5709466.37000000011175871)))
after adding the point (379701.02700000000186265
5709464.54299999959766865):
wkt_geom: Polygon ((379701.02700000000186265
5709464.54299999959766865, 379705.34999999997671694
5709460.93499999959021807, 379703.7970000000204891
5709459.07600000035017729, 379697.34799999999813735
5709464.77400000020861626, 379698.83699999999953434
5709466.37000000011175871, 379701.02700000000186265
5709464.54299999959766865))
how can I make sure that the type does not change due to editing? The
only idea i have is to remove or modify the geometry constraint in the
Spatialite database table for the geometry column. The warning still
appears but saving is successful.
Interesting fact: The problem didn't appear with QGIS 3.16.
Many thanks for your help!
Jörg Höttges
-------
FH Aachen
University of Applied Sciences
Bayernallee 9
52066 Aachen | Germany
www.fh-aachen.de/menschen/hoettges
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