[Qgis-developer] editing expressions defining virtual fields seems erratic

[Matthias Kuhn]

On 05/16/2016 01:24 PM, Janneke van Dijk wrote:
> Dear list,
>
> In a polygon shapefile I'm seeing inconstistent behaviour in virtual
> fields. The attached project and shapefile has reduced it to it's
> simplest form: the shapefile contains two virtual fields, the first
> one containing the expression 1 (integer) and the second the
> expression 2 (integer). However, when I want to edit the expression
> for the fields, the first field does not give a problem. For the
> second field I click on the 'expression' to open the expression
> builder, but the expression shown in the expression builder equals 1.
> I have not been able to find any pattern in when it happens/for what
> type of expressions. This example is the most simple form of the
> unexpected behaviour, but I have seen it with more complicated
> expressions as well. Sometimes after trying to edit one of these
> 'erratic' expressions QGIS closes with a minidump being written error
> message. Again, not always.
>
> Anyone have any idea why this might happen and how to work around it?
Fixed in master
>
> Looking forward to some thoughts...
> Janneke
>
>
> On 13/05/2016 11:36, Nyall Dawson wrote:
>> On 13 May 2016 at 17:53, Janneke van Dijk<janneke.qgis at gmail.com> 
>> wrote:
>>> Dear list,
>>>
>>> Using QGIS 2.14.2 on Windows 7 I get the following error message when
>>> zooming out on a shapefile layer that has labels switched on:
>>>
>>> GEOS
>>> Exception: IllegalArgumentException: Invalid number of points in
>>> LinearRing
>>> found 3 - must be 0 or >= 4
>>>
>>> It seems to be an old bug (https://hub.qgis.org/issues/9375) that
>>> was fixed
>>> 2 years ago.
>>>
>>> It doesn't seem to cause any problems otherwise. Anyone else have this
>>> issue? Should I file a new bug report?
>> Hi Janneke,
>>
>> Best thing to do is file an issue athttp://hub.qgis.org/issues  with a
>> copy of your data + sample project. If you do that this bug should be
>> easy for us to squash!
>>
>> Thanks,
>> Nyall
>>
>>
>>> Regards,
>>> Janneke
>>>
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>
>
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-- 
Matthias Kuhn
OPENGIS.ch - https://www.opengis.ch
Spatial • (Q)GIS • PostGIS • Open Source

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