attribute-tablefields-attributeslayersqgisselect-by-attribute
I have the items in my data attribute table, which were selected. I want to make the object with the same value be selected in the attribute table, which belongs to another layer. In both cases, the considered column is called "new_name".
If for instance the "new_name" value has been selected in the left attribute table I need exactly the same value to be selected in the other attribute table.
How can I make a selection such as this?
SOLUTION 1:
You have to remove layer.setSelectedFeatures([k.id() for k in selection]).
Because selection = layer.getFeatures(QgsFeatureRequest().setFilterExpression(query)) line gives you a QgsFeatureIterator, that's an iterator. When you use that iterator once, you reach the end of the iterator. Then, if you use it again, you get nothing.
In your case, when you use selection variable (it's an iterator now) in [k.id() for k in selection], you reach the end. If you use selection in for loop, since you are at the end of the iterator, you don't have any feature now. If you want to be certain, you can add a print("Foo") line to for loop.
SOLUTION 2:
Change for feat in selection: into for feat in layer.selectedFeatures():. This solution works only on QGIS 2.x.
Apply a buffer around the line (network) layer and dissolve it. Convert the buffers from Multipart to single parts.
Create a unique id on the buffer layer with field calculator and $id. Than add this id to the line layer with Join attributes by location (see screenshot).
Buffer layer in orange and resulting line layer in black with id added to label the network lines:
Best Answer
I can suggest a PyQGIS solution.
Proceed with
Plugins > Python Console > Show Editorand paste the script belowPress
and get the output that will look like
Run scriptReferences: