Hi,
I don't know any way to do this, except for using a workaround.
But it will depend on your use-case.
Maybe using query layers, such as
QgsVectorLayer("table='(select * from <schema>.<table> <your
conditions>)' service='<service>' key='<unique id column>'", "<table
name>", "postgres")
can help ?
Regards,
Jacky
Le 09/08/2022 à 11:15, Johannes Kröger (WhereGroup) via QGIS-Developer a
écrit :
Howdy!
I'd like to force a provider filter when a user adds a PostGIS layer
and have it applied *before* any data is loaded. Setting it after the
layer (and some of its big data) is loaded initially is not an option.
Is there a way to sneak in between "user clicked something in the GUI
to load a table/query and QGIS will construct a QgsVectorLayer now"
and "QGIS now talks to the PostGIS database to get the data for the
new layer", maybe with a signal?
Something like a "layerAboutToBeLoaded" (like the opposite
layerWillBeRemoved on
https://qgis.org/pyqgis/master/core/QgsProject.html) basically. :o)
Cheers, Hannes
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Jacky Volpes
Ingénieur SIG - Oslandia
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