[QGIS-Developer] EditInPlace Processing script

[Germán Carrillo]

Hi Matteo,

yes, it's possible to write custom Processing scripts for editing layers
in-place.

Here you can find an example (buffer):
https://github.com/gacarrillor/QGIS-Resources/blob/master/collections/processing_scripts/processing/processing_script_edit_in_place.py

>From the example we can see:

   - We need to set the QgsProcessingAlgorithm.FlagSupportsInPlaceEdits
   flag for our algorithm.
   - It's not required that our algorithm inherits from
   QgsProcessingFeatureBasedAlgorithm for it to support edit-in-place[*].
   - The supportInPlaceEdit() method allows us to specify for which layers
   our algorithm can be offered as edit-in-place.

Regards,

Germán
--------------------
[*] As a demo, the buffer example is OK. However, since each feature
generates a new feature without needing other source features, the buffer
example could also be written as a QgsProcessingFeatureBasedAlgorithm. :)

El mar., 14 abr. 2020 a las 3:22, matteo (<matteo.ghetta at gmail.com>)
escribió:

> Hi Arnaud,
>
> I explored the QgsProcessingFeatureBasedAlgorithm but unfortunately is
> not the case of what I'm looking for. From what I understood
> QgsProcessingFeatureBasedAlgorithm is the class to use when the
> algorithm performs "feature-by-feature" operations like buffers.
>
> In my case I would like to "change" the geometry of the input layer
> (union and dissolve).
>
> Cheers and thanks for the input anyway!
>
> Matteo
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