Bug report #21615

refactorfields algorithm fails for field names that start with a digit

Added by Peter Gipper over 5 years ago. Updated over 5 years ago.

Status:Closed
Priority:Normal
Assignee:-
Category:Processing/QGIS
Affected QGIS version:3.4.5 Regression?:No
Operating System:Windows 7 Easy fix?:No
Pull Request or Patch supplied:No Resolution:invalid
Crashes QGIS or corrupts data:No Copied to github as #:29431

Description

If a vector layer has field names starting with digits (i.e. "1_field") the algorithm 'refactorfields' throws an exception:
syntax error, unexpected NAME, expecting $end

Not sure if this is a bug or just not supported. When running refactorfields via QGIS GUI there are no problems.

To reproduce, execute the following code in qgis python console:

layer = QgsVectorLayer('Point?crs=epsg:4326&field=1_field:string(10)', 'test', 'memory')
field = layer.fields()[0]
field_map = [{
'name': field.name(),
'type': field.type(),
'length': field.length(),
'precision': field.precision(),
'expression': field.name()
}]
processing.runAndLoadResults('qgis:refactorfields',{
'INPUT': layer,
'FIELDS_MAPPING': field_map,
'OUTPUT':'memory:test_refactored'
})

History

#1 Updated by Giovanni Manghi over 5 years ago

  • Category changed from Processing/Core to Processing/QGIS

#2 Updated by Nyall Dawson over 5 years ago

  • Resolution set to invalid
  • Status changed from Open to Closed

The expression needs to be

"1_field"

i.e. the field name MUST be double quoted. When running through the GUI it's automatically done (unless you manually edit the expression). You need to update your code to:

field_map = [{
    'name': field.name(),
    'type': field.type(),
    'length': field.length(),
    'precision': field.precision(),
    'expression': '\"field.name()\"'
  }]

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