[QGIS-Developer] Does QgsProject.instance().createEmbeddedGroup() work?

[Johannes Kröger (WhereGroup)]

Hi Alister,

https://qgis.org/pyqgis/master/core/QgsProject.html#qgis.core.QgsProject.createEmbeddedGroup 
and 
https://api.qgis.org/api/classQgsProject.html#ad2e059da29ebfc32096367abb78da46c 
say it should return a QgsLayerTreeGroup so I guess it is broken, at 
least documentation-wise.

https://api.qgis.org/api/qgsproject_8cpp_source.html#l03274 on the other 
hand hints at several "return nullptr" so it returning None is by 
design. The code seems fairly readable and even has useful comments so 
maybe check if one of the cases might be true in your testcase.

Cheers, Hannes

Am 19.09.22 um 05:40 schrieb Alister Hood via QGIS-Developer:
> Hi, I want to programmatically embed a project, like I can in the gui 
> with "Layer>embed layers and groups."
>
> I thought QgsProject.instance().createEmbeddedGroup() was what I 
> needed, but it doesn't seem to work - see below.  Am I completely off 
> track, or is it broken?
>
> Thanks.
>
> path='/home/alister/testtoembed.qgs'
> project = QgsProject.instance()
> project.read(path)
> True
> project.clear()
> newGroup = QgsLayerTreeGroup()
> type(newGroup)
> <class 'qgis._core.QgsLayerTreeGroup'>
> newGroup = QgsProject.instance().createEmbeddedGroup('test', path, [])
> type(newGroup)
> <class 'NoneType'>
>
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-- 
Johannes Kröger / GIS-Entwickler/-Berater

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