Thank you very much, Thomas. This code comparison approach is very useful
indeed.
If FeatureSink covers all functions of VectorDestination and more, that still
leaves me wonder what is the downside of a FeatureSink
"Note: Consider using the more flexible QgsProcessingParameterFeatureSink
wherever possible."
i.e. where is it not possible to use a Feature Sink? Only in older versions of
QGIS?
Regards,
Anita
On Saturday, 22. October 2022 23:32:11 (+02:00), Thomas Gratier wrote:
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=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@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 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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