Bug report #22120

Field_name in actions

Added by Alessandro Perego over 4 years ago.

Affected QGIS version:3.4.8 Regression?:No
Operating System:Windows 10 Easy fix?:No
Pull Request or Patch supplied:No Resolution:
Crashes QGIS or corrupts data:No Copied to github as #:29933


(tested on QGIS 3.4.8 on Windows 10)

Actions in field scope have three variables: field_index, field_name, field_value.
Field_name doesn’t work when actions run from attribute table.

For example the following python action (in field scope):

from qgis.PyQt import QtWidgets
expr = '"[% @field_name ]"' + ' = ' + "'[ @field_value ]'"
QtWidgets.QMessageBox.information(None, "[
@field_name %]", expr)

works good from Identify Result panel, but when the action run from the attribute table it doesn’t show the name of the field.

A workaround is using the field index:
layer = QgsProject.instance().mapLayer('[% @layer_id ]')
field_name = layer.fields().field([
@field_index %]).name()

compare.jpg - Different results fron Identify Result and fron Attribute Table (57 KB) Alessandro Perego, 2019-05-22 09:14 AM

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