[QGIS-Developer] PyQGIS: add feature (+defaults/expressions), with Form

[Richard Duivenvoorde]

In the issue Alessandro pointed to:

QgsVectorLayerUtils.createFeature

https://qgis.org/pyqgis/master/core/QgsVectorLayerUtils.html?highlight=qgsvectorlayerutils#qgis.core.QgsVectorLayerUtils.createFeature

THAT one takes the expression context into account!

So:
Given an editable layer 'layer' and a valid 'geom":

feat = QgsVectorLayerUtils.createFeature(layer, geom, {}, layer.createExpressionContext() )
iface.openFeatureForm(layer, feat)

works!!

Thanks Alessandro,

Regards,

Richard Duivenvoorde


On 11/23/20 10:34 AM, Richard Duivenvoorde wrote:
> Hi Core Devs,
> 
> I'm thinking about a solution for this 
> 
> https://github.com/qgis/QGIS/issues/40213
> (PyQGIS: iface.openFeatureForm() seems not to handle autofill fields)
> 
> My conclusion is: the normal handling of default values or expression based attribute values, and the opening of the form dialog, are 'locked' in QgsFeatureAction::addFeature (glued together with the opening of the form):
> 
> https://github.com/qgis/QGIS/blob/master/src/app/qgsfeatureaction.cpp#L168-L320
> I do see a way to fix it (as in: use "iface.openFeatureForm: in PyQGIS WITH the handling of default and expression values).
> 
> I wonder if anybody has an opinion about moving part of this functionality to the vector layer.
> Talking about
> - setting defaults
> - setting expression based values
> 
> So QgsFeatureAction::addFeature would be shrunken till: 
> - layer.initAttributesForFeatures (or somethink like that)
> - open feature form...
> 
> Is this OK for others? Or is the general opinion that you should copy all this to PyQGIS if you want to open the feature form?
> 
> Thanks for any input.
> 
> Regards,
> 
> Richard Duivenvoordd
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