[Qgis-user] Setting configuration of a field in a vector layer

[Roland Berger]

Hi Etienne

Thanks. Worked!
Do you know of a good documentation explaining the Philosophie of the 
pyQgis API?
I never know which approach I need to take to change/add information: 
Working directly on the object, when to use a data provider, when to 
call layer.startEditing() / layer.commitChanges() /  layer.updateField() 
and so on.
Or in other words: From where do you know that I worked on a copy of the 
QgsField?

Regards
Roland

On 8/2/24 11:50, Etienne Trimaille wrote:
> Hi,
> You should use the method in QgsVectorLayer, otherwise, you are 
> updating a "copy" of the QgsField :
>
> for field in layer.fields():
>      layer.setFieldConfigurationFlag(
>         layer.fields().indexFromName(field.name 
> <http://field.name>()), Qgis.FieldConfigurationFlag.HideFromWfs, True)
>
> On GitHub.com, I often search for a piece of code to see existing 
> plugin how they deal with a piece of code :
> https://github.com/search?q=FieldConfigurationFlag+language%3APython&type=code&l=Python 
> <https://github.com/search?q=FieldConfigurationFlag+language%3APython&type=code&l=Python>
> There is only one script, as this API is quite new, but still nice to 
> know for next time.
>
>
> Le jeu. 1 août 2024 à 17:09, Roland Berger via QGIS-User 
> <qgis-user at lists.osgeo.org> a écrit :
>
>     Hi
>
>     I try to set the configuration for a vector layer with python.
>     Below is one of the many ways I tried to do it.
>     Now I'm of out of ideas (chatgpt, intellij ai assistent and google as
>     well) and would be thankful for a working example.
>
>     Thanks Roland
>
>     Code you can use in a Python Console Editor. First it creates a
>     layer to
>     use for the test and then tries to set the field configuration.
>
>     # =================
>     # Setup Layer with field
>     # =================
>
>     # Create a vector layer
>     layer = QgsVectorLayer("Point?crs=EPSG:4326", "MyLayer", "memory")
>     if not layer.isValid():
>          print("Failed to create the layer!")
>          sys.exit(1)
>
>     # Add fields to the layer
>     layer_data_provider = layer.dataProvider()
>     layer_data_provider.addAttributes([QgsField("field1",
>     QVariant.String)])
>     layer.updateFields()
>
>     # Add a feature to the layer
>     feature = QgsFeature(layer.fields())
>     feature.setGeometry(QgsGeometry.fromPointXY(QgsPointXY(0, 0)))
>     feature.setAttribute("field1", "value1")
>     layer_data_provider.addFeature(feature)
>     layer.updateExtents()
>
>     # Add the layer to the project
>     project = QgsProject.instance()
>     project.addMapLayer(layer)
>
>     # =================
>     # Try to set field configuration
>     # =================
>     layer.startEditing()
>     for field in layer.fields():
>          config_flags = field.configurationFlags()
>          config_flags |= Qgis.FieldConfigurationFlag.HideFromWfs
>          field.setConfigurationFlags(config_flags)
>     #layer.updateFields()
>     layer.commitChanges()
>
>
>
>
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