Re: [QGIS-Developer] Concatenating QgsFeatureRequest

[matteo]

Hi Etienne,

yep Nyall's blog is really outstanding useful, thanks!

Cheers

Matteo
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Re: [QGIS-Developer] Concatenating QgsFeatureRequest

[matteo]

Hi Matthias,

thanks for the help!

Matteo
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Re: [QGIS-Developer] Concatenating QgsFeatureRequest

[Etienne Trimaille]

Hi,

You should have a look to the blog post from Nyall:
http://nyalldawson.net/2016/10/speeding-up-your-pyqgis-scripts/
So you can still use your `setFilterExpression`

1
2
3
request =
QgsFeatureRequest().setFilterFids(vector_layer.selectedFeaturesIds())
for feature in vector_layer.getFeatures(request):
# do something with the feature


2017-12-19 16:41 GMT+01:00 Matthias Kuhn :

> Hi Matteo,
>
> No, it's not possible to combine the two in the query itself.
>
> But sending the request with the filter expression and then checking if
> each feature's id is in selectedFeatureIds() should be straightforward.
>
> selcted_ids = layer.selectedFeatureIds()
> for feature in layer.getFeatures(request):
> if feature.id() in selected_ids:
> do_amazing_stuff_with(feature)
>
> Matthias
>
> On 12/19/2017 04:33 PM, matteo wrote:
> > Hi devs,
> >
> > maybe the question can sound trivial but I didn't find a solution.
> >
> > Simply I would like to iterate only on selected features of a vector
> > layer features with an expression.
> >
> > I know that the QgsFeatureRequest can be used with `setFilterExpression`
> > and `setFilterFids`.
> >
> > Is it possible to combine them, so merging the following example in an
> > unique request?
> >
> > exp = ''' "PH" > 7 '''
> > request = QgsFeatureRequest().setFilterExpression(exp)
> > l = [i.id() for i in vl.selectedFeatures()]
> > request = QgsFeatureRequest().setFilterFids(l)
> >
> > for i in vl.getFeatures(request):
> > ..
> >
> >
> > Thanks for all the suggestions!
> >
> > Cheers
> >
> > Matteo
> > ___
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Re: [QGIS-Developer] Concatenating QgsFeatureRequest

[Matthias Kuhn]

Hi Matteo,

No, it's not possible to combine the two in the query itself.

But sending the request with the filter expression and then checking if
each feature's id is in selectedFeatureIds() should be straightforward.

selcted_ids = layer.selectedFeatureIds()
for feature in layer.getFeatures(request):
if feature.id() in selected_ids:
do_amazing_stuff_with(feature)

Matthias

On 12/19/2017 04:33 PM, matteo wrote:
> Hi devs,
> 
> maybe the question can sound trivial but I didn't find a solution.
> 
> Simply I would like to iterate only on selected features of a vector
> layer features with an expression.
> 
> I know that the QgsFeatureRequest can be used with `setFilterExpression`
> and `setFilterFids`.
> 
> Is it possible to combine them, so merging the following example in an
> unique request?
> 
> exp = ''' "PH" > 7 '''
> request = QgsFeatureRequest().setFilterExpression(exp)
> l = [i.id() for i in vl.selectedFeatures()]
> request = QgsFeatureRequest().setFilterFids(l)
> 
> for i in vl.getFeatures(request):
> ..
> 
> 
> Thanks for all the suggestions!
> 
> Cheers
> 
> Matteo
> ___
> QGIS-Developer mailing list
> QGIS-Developer@lists.osgeo.org
> List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer
> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer
> 
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[QGIS-Developer] Concatenating QgsFeatureRequest

[matteo]

Hi devs,

maybe the question can sound trivial but I didn't find a solution.

Simply I would like to iterate only on selected features of a vector
layer features with an expression.

I know that the QgsFeatureRequest can be used with `setFilterExpression`
and `setFilterFids`.

Is it possible to combine them, so merging the following example in an
unique request?

exp = ''' "PH" > 7 '''
request = QgsFeatureRequest().setFilterExpression(exp)
l = [i.id() for i in vl.selectedFeatures()]
request = QgsFeatureRequest().setFilterFids(l)

for i in vl.getFeatures(request):
..


Thanks for all the suggestions!

Cheers

Matteo
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