Re: [Qgis-user] When running a Custom Function, the return value is different from when stepping through it and watching the 'Preview' value in Field Calculator
Oh "for Pete's sake". - I'd love someone to explain why that is needed
and not auto-turned on or defaulted to True.
Thank you for bringing my attention to that tidbit.
Kind regards,
Zoltan
On 2021-10-19 19:07, DelazJ wrote:
Hi Zoltan,
You are playing with geometry so you need usesgeometry=True in your
function decorator.
See
https://docs.qgis.org/3.16/en/docs/user_manual/working_with_vector/expression.html#function-editor
or the help section in the Function Editor tab.
Regards,
Harrissou
Le mar. 19 oct. 2021 à 18:33, Zoltan a écrit :
Hi,
Me again :-(
I've written a custom function in Field Calculator and want to put
its return value into a new Text field in the attribute table.
When I step through the features I get the correct and expected
values shown next to 'Preview'
But
when I click OK to run the Field Calculator, it runs for a long
enough time, auto-closes on completion and in the attribute table
the new field is created, but value is 'Nothing for None' for all
features.
*Note:* variable rd_at reflects correct contents when stepping
through and observing 'Preview' but seems to revert to Nonetype
when running the function.
What am I missing regarding using custom functions?
Is it an intended thing that the Field Calculator auto-closes
after running a custom function?
Thanks again,
Kind regards,
Zoltan
*Note:* The msg variable was introduced in case placing 'return'
in various lines in the script was causing problems. I have also
made the script below "more pedantic" to try and debug it.
from qgis.core import *
from qgis.gui import *
import processing
@qgsfunction(args='auto', group='Custom', referenced_columns=[])
def del_cutboxes(feature, parent):
geom = feature.geometry()
attr = feature.attributes()
rd_at = str(attr[5])
lyr_rcl =
QgsVectorLayer('Z:/Projects/RCL_boxes.shp','lyrrcl','ogr')
rcl_feats = lyr_rcl.getFeatures()
msg = ''
for rcl_feat in rcl_feats:
if len(msg) == 0:
rclbox = rcl_feat.geometry()
if rclbox.contains(geom):
if rcl_feat.attributes()[0] is not rd_at:
#feature.delete()
msg = 'ToDelete ' + rd_at
else:
msg = 'ToKeep ' + rd_at
if len(msg) == 0:
msg = 'Nothing for ' + rd_at
return msg
--
=
Zoltan Szecsei GPrGISc 0031
Geograph (Pty) Ltd.
GIS and Photogrammetric Services
Cape Town, South Africa.
Mobile: +27-83-6004028 (Signal, not WhatsApp)
www.geograph.co.za
=
___
Qgis-user mailing list
Qgis-user@lists.osgeo.org
List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
--
=
Zoltan Szecsei GPrGISc 0031
Geograph (Pty) Ltd.
GIS and Photogrammetric Services
Cape Town, South Africa.
Mobile: +27-83-6004028 (Signal, not WhatsApp)
www.geograph.co.za
=
___
Qgis-user mailing list
Qgis-user@lists.osgeo.org
List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] When running a Custom Function, the return value is different from when stepping through it and watching the 'Preview' value in Field Calculator
Hi Zoltan,
You are playing with geometry so you need usesgeometry=True in your
function decorator.
See
https://docs.qgis.org/3.16/en/docs/user_manual/working_with_vector/expression.html#function-editor
or the help section in the Function Editor tab.
Regards,
Harrissou
Le mar. 19 oct. 2021 à 18:33, Zoltan a écrit :
> Hi,
> Me again :-(
>
> I've written a custom function in Field Calculator and want to put its
> return value into a new Text field in the attribute table.
>
> When I step through the features I get the correct and expected values
> shown next to 'Preview'
> But
> when I click OK to run the Field Calculator, it runs for a long enough
> time, auto-closes on completion and in the attribute table the new field is
> created, but value is 'Nothing for None' for all features.
> *Note:* variable rd_at reflects correct contents when stepping through
> and observing 'Preview' but seems to revert to Nonetype when running the
> function.
>
> What am I missing regarding using custom functions?
> Is it an intended thing that the Field Calculator auto-closes after
> running a custom function?
>
> Thanks again,
> Kind regards,
> Zoltan
>
> *Note:* The msg variable was introduced in case placing 'return' in
> various lines in the script was causing problems. I have also made the
> script below "more pedantic" to try and debug it.
>
> from qgis.core import *
> from qgis.gui import *
> import processing
>
> @qgsfunction(args='auto', group='Custom', referenced_columns=[])
> def del_cutboxes(feature, parent):
> geom = feature.geometry()
> attr = feature.attributes()
> rd_at = str(attr[5])
> lyr_rcl = QgsVectorLayer('Z:/Projects/RCL_boxes.shp','lyrrcl','ogr')
> rcl_feats = lyr_rcl.getFeatures()
> msg = ''
> for rcl_feat in rcl_feats:
> if len(msg) == 0:
> rclbox = rcl_feat.geometry()
> if rclbox.contains(geom):
> if rcl_feat.attributes()[0] is not rd_at:
> #feature.delete()
> msg = 'ToDelete ' + rd_at
> else:
> msg = 'ToKeep ' + rd_at
> if len(msg) == 0:
> msg = 'Nothing for ' + rd_at
> return msg
>
>
>
>
>
>
> --
>
> =
> Zoltan Szecsei GPrGISc 0031
> Geograph (Pty) Ltd.
> GIS and Photogrammetric Services
>
> Cape Town, South Africa.
>
> Mobile: +27-83-6004028 (Signal, not WhatsApp)www.geograph.co.za
> =
>
> ___
> Qgis-user mailing list
> Qgis-user@lists.osgeo.org
> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
>
___
Qgis-user mailing list
Qgis-user@lists.osgeo.org
List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] When running a Custom Function, the return value is different from when stepping through it and watching the 'Preview' value in Field Calculator
Hi,
Me again :-(
I've written a custom function in Field Calculator and want to put its
return value into a new Text field in the attribute table.
When I step through the features I get the correct and expected values
shown next to 'Preview'
But
when I click OK to run the Field Calculator, it runs for a long enough
time, auto-closes on completion and in the attribute table the new field
is created, but value is 'Nothing for None' for all features.
*Note:* variable rd_at reflects correct contents when stepping through
and observing 'Preview' but seems to revert to Nonetype when running the
function.
What am I missing regarding using custom functions?
Is it an intended thing that the Field Calculator auto-closes after
running a custom function?
Thanks again,
Kind regards,
Zoltan
*Note:* The msg variable was introduced in case placing 'return' in
various lines in the script was causing problems. I have also made the
script below "more pedantic" to try and debug it.
from qgis.core import *
from qgis.gui import *
import processing
@qgsfunction(args='auto', group='Custom', referenced_columns=[])
def del_cutboxes(feature, parent):
geom = feature.geometry()
attr = feature.attributes()
rd_at = str(attr[5])
lyr_rcl =
QgsVectorLayer('Z:/Projects/RCL_boxes.shp','lyrrcl','ogr')
rcl_feats = lyr_rcl.getFeatures()
msg = ''
for rcl_feat in rcl_feats:
if len(msg) == 0:
rclbox = rcl_feat.geometry()
if rclbox.contains(geom):
if rcl_feat.attributes()[0] is not rd_at:
#feature.delete()
msg = 'ToDelete ' + rd_at
else:
msg = 'ToKeep ' + rd_at
if len(msg) == 0:
msg = 'Nothing for ' + rd_at
return msg
--
=
Zoltan Szecsei GPrGISc 0031
Geograph (Pty) Ltd.
GIS and Photogrammetric Services
Cape Town, South Africa.
Mobile: +27-83-6004028 (Signal, not WhatsApp)
www.geograph.co.za
=
___
Qgis-user mailing list
Qgis-user@lists.osgeo.org
List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
