Bug report #14998: Invalid scripts from models with intermediate vector outputs - QGIS Application - QGIS Issue Tracking

Bug report #14998

Invalid scripts from models with intermediate vector outputs

Added by Apus Systems - almost 8 years ago. Updated over 7 years ago.

Status:	Closed
Priority:	Normal
Assignee:	Victor Olaya
Category:	Processing/Modeller
Affected QGIS version:	2.14.3	Regression?:	No
Operating System:		Easy fix?:	No
Pull Request or Patch supplied:	No	Resolution:
Crashes QGIS or corrupts data:	No	Copied to github as #:	22945

Description

When exporting a model as script, vector outputs from intermediate algorithms appear as None parameter in corresponding processing.runalg call.
Here is the exported script:

##Save Selection=name ##input=vector ##selection=output vector outputs_QGISSELECTBYEXPRESSION_1=processing.runalg('qgis:selectbyexpression', input,'TRUE',0,None) outputs_QGISSAVESELECTEDFEATURES_1=processing.runalg('qgis:saveselectedfeatures', outputs_QGISSELECTBYEXPRESSION_1['RESULT'],selection)

This however causes the script to fail, because algorithm 'qgis:selectbyexpression' does not need an output parameter in its .runalg call.
Here is the Console Message after running the script:

Error: Wrong number of parameters ALGORITHM: Select by expression LAYERNAME <ParameterVector> EXPRESSION <ParameterString> METHOD <ParameterSelection> RESULT <OutputVector>

After having manually deleted the output parameter 'None', everything works as expected.
We experience the same issue with the following algorithms:

'qgis:selectbyattribute'
'qgis:selectbylocation'

as well as algorithms from user scripts.

QGIS 2.14.3
Python 2.7.9
Qt 4.8.6