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I have a geopackage layer that I want to always be used in an algorithm in the QGIS 3.6 graphical modeler. When I use the triple dots to navigate to the geopackage it doesn't give me the option to choose a layer in the geopackage. Is there syntax I can use in the file path to identify the layer? In the example screenshot I want to use the layer AOI_Poly2 from the geopackage AOI as the mask layer. It seems like it will work but it chooses the first polygon layer in the gpkg (AOI_poly). I have tried appending "|layername=AOI_poly2" to the file path but the dialog won't let me save. I am using windows 10. enter image description here

  • I don't understand when the windows file explorer is coming. Can you edit your question? You mean you need to add the layer name to the path geopackage path? – etrimaille Jul 19 at 7:39
  • Yes- I hope the question is clearer now. – Baswein Jul 19 at 12:26
  • Yes, better indeed. – etrimaille Jul 19 at 15:39
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I tried to create a string input, with the default value /home/etienne/test.gpkg|layername=layer4, I can use this input as Input layer, but yes I can't select it for Mask layer. This looks like a bug to me.

What I could do is to use the string concatenation algorithm. Use a string input with the geopackage path and append the name of the layer you would like to use. I don't know why, but the model will allow to use the output of the algorithm. It is a workaround. Maybe you can report this bug to QGIS on github?

enter image description here

  • Thanks that is a valid work around. - I’ll add this to the Qgis bug report. Really l think it is that this is just one of the places that geopackage hasn’t been fully implemented yet. – Baswein Jul 19 at 19:26
  • Added this as a feature request: github.com/qgis/QGIS/issues/30827 – Baswein Jul 19 at 21:06

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