[postgis-users] Saving a split polygon

[Peter Brown]

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 <hugues.francois at irstea.fr> 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:* postgis-users-bounces at lists.osgeo.org [mailto:
> postgis-users-bounces at lists.osgeo.org] *On Behalf Of *Peter Brown
> *Sent:* Monday, October 07, 2013 9:53 AM
> *To:* postgis-users at lists.osgeo.org
> *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
>
>
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