Ah that’s fine thank you Andreas and Even.


From: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of 
Neumann, Andreas
Sent: 19 October 2016 13:55
To: Even Rouault
Cc: qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] Split features using Geopackage layer?

As far as I know, Nyall Dawson is currently working on fixing this, as part of 
his work on unique value constraints (provider provided or qgis provided where 
the provider doesn't support it). But not sure about the details. Certainly, 
PostgreSQL and Geopackage are top priorities for that. And his work targets 
QGIS 3.x, not for 2.x



On 2016-10-19 14:43, Even Rouault wrote:
Le mercredi 19 octobre 2016 14:14:40, Chris Buckmaster a écrit :

I have a geopackage polygon layer and I am trying to split a simple feature
within it.

When I try to do it, I get an error message 'failed to insert, UNIQUE
constraint failed'.

Is this a known issue with splitting features using the geopackage format,
it could it be how the layer is set up?

No, it is due to the fact that when splitting the feature, the newly created
feature receives the same 'fid' value (the first column in the attribute table)
as the other part, and that when creating the feature, the fid, when set, is
honoured. Hence given the duplication of fid, the failure. Before saving the
edits, you can manually unset the fid.

Although something should probably be done either in the splitting tool to
unset the fid column of the new feature. Or perhaps the provider could be made
more tolerant in the case of duplicated FID to assign a new one.

This could happen for other formats handled by OGR like spatialite (if not
going throug the QGIS spatialite provider), FileGDB, etc...

Would probably deserve a ticket in the bug tracker.


Qgis-user mailing list
List info: http://lists.osgeo.org/mailman/listinfo/qgis-user
Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user

Reply via email to