[Qgis-user] Selection issue for large set of features

[Yves Moisan]

> I would like to use selectedFeaturesIds() but I can't rely on ids 
> returned being the actual PK.
A way to circumvent the PK identification issue on a PG view :

- load layers whichever way (browser, DB Manager, etc.); at this time 
keyColumn() on a QgsDataSourceURI object made from that layer will be 
whatever int4 field is the most probable candidate for a PK
- save the project file
- open project file in a text editor, search *key='* and check the value 
corresponds to the actual field name you want in postgis <maplayer> 
items; if not, change it
- reopen QGIS and voilà : keyColumn() returns the expected value and 
selectedFeaturesIds() too

Yves


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