[QGIS-Developer] Get data from QgsFieldExpressionWidget (QGIS Master)

[Nyall Dawson]

On 26 June 2017 at 21:11, matteo <matteo.ghetta at gmail.com> wrote:
> Hi all,
>
> I'm writing a plugin that uses QgsFieldExpressionWidget to get the field
> and its attributes from a layer.
>
> I'm really fighting to find a method to get the attributes of the field
> as a list when an expression if typed.

In QGIS 3.0 QgsVectorLayer::getValues will do what you want in a single call:

https://qgis.org/api/classQgsVectorLayer.html#ac8cfb12633ed536da73f42ebff095f99

That works for either a field:

layer.getValues('my_field')

or an expression:

layer.getValues('my_field * 2')

Nyall