[Qgis-developer] problem with feature request and updateFeature

[Jürgen E. Fischer]

Hi Nathan,

On Sat, 23. Mar 2013 at 00:29:03 +1000, Nathan Woodrow wrote:
> If updateFeature is indeed doing feature request inside and breaking the loop
> then that is a bug.  updateFeature should not affect the feature

The misfeature is that there can only be one active iterator per provider (see
also [1]).  So the feature iterator in updateFeature closes the iterator of the
loop.

> What should I do if I want to modify features during the loop?

replacing

>                      f.setAttribute( field, QVariant( 1 ) )
>                      vectorLayer.updateFeature( f )

with

		       vectorLayer.changeAttributeValue( f.id(), field, 1 )

should help.


Jürgen

[1] http://hub.qgis.org/issues/7071#note-6

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