Error in [Traffic assignment] - [add traffic class to assignment] when checked "remove selected links from the graph"

[JesseE]

Hello everyone ,

Thanks for your great work!

I'm using the example project of SiouxFalls, there is an error in [Traffic assignment] - [add traffic class to assignment] when checked "remove selected links from the graph", so I can't use sub-graph ( not all the links ) to assignment ( I have already selected some links by tool of QGIS) , I wander how to fix this?

Best regards,

Jesse

An error has occurred while executing Python code:

AttributeError: 'TrafficAssignmentDialog' object has no attribute 'link_layer' Traceback (most recent call last):
  File "C:\Users/Administrator/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\qaequilibrae\modules\paths_procedures\traffic_assignment_dialog.py", line 260, in _create_traffic_class
    idx = self.link_layer.dataProvider().fieldNameIndex("link_id")
          ^^^^^^^^^^^^^^^
AttributeError: 'TrafficAssignmentDialog' object has no attribute 'link_layer'

Python version: 3.12.11 (main, Jun 17 2025, 13:41:12) [MSC v.1943 64 bit (AMD64)]
QGIS version: 3.40.8-Bratislava Bratislava, efaf8952e0

Python Path:

• C:\Users/Administrator/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\qaequilibrae\packages
• D:/Program Files/QGIS 3.40.8/apps/qgis-ltr/./python
• C:/Users/Administrator/AppData/Roaming/QGIS/QGIS3\profiles\default/python
• C:/Users/Administrator/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins
• D:/Program Files/QGIS 3.40.8/apps/qgis-ltr/./python/plugins
• D:\Program Files\QGIS 3.40.8\apps\grass\grass84\etc\python
• C:\Users\Administrator\Documents
• D:\Program Files\QGIS 3.40.8\bin\python312.zip
• D:\Program Files\QGIS 3.40.8\apps\Python312\DLLs
• D:\Program Files\QGIS 3.40.8\apps\Python312\Lib
• D:\Program Files\QGIS 3.40.8\bin
• D:\Program Files\QGIS 3.40.8\apps\Python312
• D:\Program Files\QGIS 3.40.8\apps\Python312\Lib\site-packages
• D:\Program Files\QGIS 3.40.8\apps\Python312\Lib\site-packages\win32
• D:\Program Files\QGIS 3.40.8\apps\Python312\Lib\site-packages\win32\lib
• D:\Program Files\QGIS 3.40.8\apps\Python312\Lib\site-packages\Pythonwin
• C:/Users/Administrator/AppData/Roaming/QGIS/QGIS3\profiles\default/python
• C:\Users\Administrator\AppData\Roaming\QGIS\QGIS3\profiles\default\python\plugins\qaequilibrae

[Pedro Camargo]

This looks like a bug, Jesse.  Can you report it on GitHub? 

Cheers, 

Pedro 

---- On Tue, 08 Jul 2025 19:23:28 +1000 jesse...@gmail.com wrote ----

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[Renata Imai]

Hi Jesse!

Thanks for reporting this bug. I managed to fix it and added a new test to our code to avoid this from happening again. The fix will be at our next QAequilibraE release.

Cheers, Renata.

To view this discussion visit https://groups.google.com/d/msgid/aequilibrae/197e966a3e5.5cbd39f4235751.1045888276724221103%40margo.co.

[JesseE]

OK!

Thanks for your reply!

Best regards,

Jesse

[JesseE]

Thank you very much!