Thanks for your prompt response, it is nice to know that it is possible, but the methods you remember do seem to have problems. - in QGIS I can split a polygon which is on a layer, and under the 'layer' option on the menu, I call up the attributes table, but that only offers me all the fields in the base PostGIS table EXCEPT (a) the ID and (b) the geometry - I have tried manufacturing another PostGIS table with all the attributes of the polygon except an ID field with all its 'NO NULLS' etc, but then when I open a layer in QGIS it draws the polygon but shows it as not editable You have obviously managed something clever, but I am not quite sure what Regards Peter Brown
On 7 October 2013 09:32, Hugues François <[email protected]> wrote: > ** > Hello, > > I previously edited polygons from postgis within qgis and with no problem. > If I remember well, before saving I also filled attribute data to give a > new ID. Maybe if you just want to edit polygons without changing > attributes, you may remove constraints on your postgis table (especially, > uniques, not null and primary key) before editing (and then put the things > right back to postgis). > > Hugues. > > > > ------------------------------ > *From:* [email protected] [mailto: > [email protected]] *On Behalf Of *Peter Brown > *Sent:* Monday, October 07, 2013 9:53 AM > *To:* [email protected] > *Subject:* [postgis-users] Saving a split polygon > > In Quantum GIS (QGIS) there is a very useful facility for taking a > polygon in a PostGIS database linked to QGIS and splitting it. HOWEVER, > when one then tries to save the two portions, PostGIS puts up an error > message that it cannot save the new portion because it does not have a new > ID (it can save the existing portion, because this is only an edit of an > existing ID). > There are workarounds for this (e.g. convert to 'Shape' files) but they > seem incredibly clumsy. Does anyone have a more direct solution? > Thanks > Peter Brown > > > _______________________________________________ > postgis-users mailing list > [email protected] > http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users >
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