[QGIS-Developer] [Processing][Question] Using Data defined proprieties

Nyall Dawson nyall.dawson at gmail.com
Wed Mar 18 15:58:34 PDT 2020

On Wed, 18 Mar 2020 at 02:21, João Gaspar <joao.f.r.gaspar at gmail.com> wrote:
> Hi Devs,
> I have a question about using data defined proprieties in algorithms. For instance,
> if I want to do a Buffer using a field with a distance column I can use the data defined proprieties and choose the field with distance.
> But when I want to use more than 1 layer and switch to batch processing where I want to define the field with distance of each layer I can't use this option.
> I try to use the name of the field in the option Add Values by Expression and Calculate by Expression but the batch processing always assumes a default value (10).
> In the case of SAGA and buffer algorithm, when you switch for batch processing is possible to choose the field of distance per layer.
> What am I'm doing wrong? Or This is expected behaviour?

It's actually just an oversight. I just tested and (with a tiny code
change) it works fine. I'll open a PR.


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