toString() error on array types

[electromuis]

When trying to make an array out of a linked part in an assembly and try to save, I get the error:

20:36:37 PropertyPythonObject::toString(): failed for <class 'Asm4_objects.ExpressionArray'> 20:36:37 Traceback (most recent call last): File "C:\Program Files\FreeCAD 0.21\bin\lib\json\__init__.py", line 231, in dumps return _default_encoder.encode(obj) File "C:\Program Files\FreeCAD 0.21\bin\lib\json\encoder.py", line 199, in encode chunks = self.iterencode(o, _one_shot=True) File "C:\Program Files\FreeCAD 0.21\bin\lib\json\encoder.py", line 257, in iterencode return _iterencode(o, 0) File "C:\Program Files\FreeCAD 0.21\bin\lib\json\encoder.py", line 179, in default raise TypeError(f'Object of type {o.__class__.__name__} ' <class 'TypeError'>: Object of type FeaturePython is not JSON serializable 20:36:37 PropertyPythonObject::toString(): failed for <class 'Asm4_objects.ViewProviderArray'> 20:36:37 Traceback (most recent call last): File "C:\Program Files\FreeCAD 0.21\bin\lib\json\__init__.py", line 231, in dumps return _default_encoder.encode(obj) File "C:\Program Files\FreeCAD 0.21\bin\lib\json\encoder.py", line 199, in encode chunks = self.iterencode(o, _one_shot=True) File "C:\Program Files\FreeCAD 0.21\bin\lib\json\encoder.py", line 257, in iterencode return _iterencode(o, 0) File "C:\Program Files\FreeCAD 0.21\bin\lib\json\encoder.py", line 179, in default raise TypeError(f'Object of type {o.__class__.__name__} ' <class 'TypeError'>: Object of type ViewProviderLink is not JSON serializable

Freecad version: 0.21.2
Running on commit 83c713e

(Same error happens to v0.50.7)

[Zolko-123]

Yes I see it. It works in 0.21.0 so it's a FreeCAD regression. Let's hope it is fixed in the upcoming 0.21.3

[Zolko-123]

I can confirm that this happens on FreeCAD v0.21.2, but works in v0.21.1 and in latest 0.22 weekly build (Version: 0.22.0dev.37573 (Git) AppImage).

I think that it's due to the backport from the 0.22 branch of some bleeding-edge Python 3.11 stuff.

My advice : use FreeCAD v0.21.1

[Zolko-123]

This should be fixed in the latest development branch. Will be in the main branch soon