[QGIS-Developer] Vector destination vs feature sink

[Thomas Gratier]

Hi,

Although, I do know the intend to recommend one against the other, doing
some code differences helps to sort out things.
They both inherits from same classes but the constructor for
QgsProcessingParameterFeatureSink accepts an additionnal arg bool
supportsAppend
<https://api.qgis.org/api/3.22/classQgsProcessingParameterFeatureSink.html#acae2863d5dab37aec4c5466d7d3a84d9>
=false

You also find the additional methods in QgsProcessingParameterFeatureSink
to manipulate the same supportsAppend.

```
a = QgsProcessingParameterVectorDestination(
  'OUTPUT',
  'Sortie'
)

b = QgsProcessingParameterFeatureSink(
  'OUTPUT',
  'Sortie'
)

methods_a = dir(a)
methods_b = dir(b)
common_methods = set(methods_a).intersection(methods_b)
print(common_methods)

only_in_a = set(methods_a).difference(methods_b)
print(only_in_a)

only_in_b = set(methods_b).difference(methods_a)
print(only_in_b)
```

Regards

Thomas Gratier

Le ven. 21 oct. 2022 à 18:07, Anita Graser via QGIS-Developer <
qgis-developer at lists.osgeo.org> a écrit :

> Thank you Stefan,
>
> I saw that note but was hoping some developer could shed light on what
> they mean by "more flexible" and "wherever possible". I guess otherwise
> it's just trial and error.
>
> Regards,
> Anita
>
>
> On Wednesday, 19. October 2022 07:44:05 (+02:00), Stefan Giese
> (WhereGroup) wrote:
>
> Hi Anita,
>
> they are very similar, but the API Documentation says to
> QgsProcessingParameterVectorDestination: "Note: Consider using the more
> flexible QgsProcessingParameterFeatureSink
> <https://api.qgis.org/api/3.22/classQgsProcessingParameterFeatureSink.html>
> wherever possible." (
> https://api.qgis.org/api/3.22/classQgsProcessingParameterVectorDestination.html#details
> )
>
> Best regards
>
> Stefan
> Am 18.10.2022 um 20:35 schrieb Anita Graser via QGIS-Developer:
>
> Hi.
>
> Does any one of you know the real difference between
> QgsProcessingParameterVectorDestination versus
> QgsProcessingParameterFeatureSink? They seem to be used interchangably in
> the resources I can find.
>
> Thank you.
>
> Anita
>
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