Error accessing custom properties? #86765

New Issue

Will · 2021-03-20T18:04:36+01:00

Will commented

2021-03-20 18:04:36 +01:00

System Information
Operating system: Linux
Graphics card: Intel

Blender Version
Broken: 2.92

Short description of error
rna_xml.rna2xml seems to try to access object custom properties as Python object attributes, which does not work.

Traceback (most recent call last):
  File "<blender_console>", line 1, in <module>
  File "/usr/share/blender/2.92/scripts/modules/rna_xml.py", line 222, in rna2xml
    value = getattr(root_rna, attr)
AttributeError: 'Object' object has no attribute 'prop'

Exact steps for others to reproduce the error

Select the default cube
add a custom property to it ("prop")
Try accessing this "prop" or run:

import rna_xml; rna_xml.rna2xml(root_node="SomeName", root_rna=C.active_object)

**System Information** Operating system: Linux Graphics card: Intel **Blender Version** Broken: 2.92 **Short description of error** `rna_xml.rna2xml` seems to try to access object custom properties as Python object attributes, which does not work. ``` Traceback (most recent call last): File "<blender_console>", line 1, in <module> File "/usr/share/blender/2.92/scripts/modules/rna_xml.py", line 222, in rna2xml value = getattr(root_rna, attr) AttributeError: 'Object' object has no attribute 'prop' ``` **Exact steps for others to reproduce the error** - Select the default cube - add a custom property to it ("prop") - Try accessing this "prop" or run: ``` import rna_xml; rna_xml.rna2xml(root_node="SomeName", root_rna=C.active_object) ```

Will commented

2021-03-20 18:04:36 +01:00

Added subscriber: @WCN

Germano Cavalcante commented

2021-03-23 20:47:39 +01:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2021-03-23 20:47:39 +01:00

Changed status from 'Needs Triage' to: 'Confirmed'

Germano Cavalcante commented

2021-03-23 20:47:39 +01:00

Interesting that 'prop' in dir(ob) returns True.
I don't think the problem is in the rna2xml module, but something involving custom properties.

Interesting that `'prop' in dir(ob)` returns `True`. I don't think the problem is in the `rna2xml` module, but something involving custom properties.

Germano Cavalcante changed title from ~~`rna2xml` chokes on custom properties?~~ to Error accessing custom properties?

2021-03-23 20:49:33 +01:00

Will commented

2021-03-27 14:55:27 +01:00

Ah, yeah. I guess there's two contradictory behaviours: Custom properties are usually item keys, but dir() seems to treat them like attributes? Which one is more correct, and does anything rely on the current behaviour of dir()?

I can't imagine that anything would rely on dir(), since dir() doesn't provide any way to differentiate custom properties from actual attributes, so anything using dir() would presumably just choke on attempted access in the same way that rna2xml does.

Ah, yeah. I guess there's two contradictory behaviours: Custom properties are usually item keys, but `dir()` seems to treat them like attributes? Which one is more correct, and does anything rely on the current behaviour of `dir()`? I can't imagine that anything would rely on `dir()`, since `dir()` doesn't provide any way to differentiate custom properties from actual attributes, so anything using `dir()` would presumably just choke on attempted access in the same way that `rna2xml` does.

Campbell Barton self-assigned this 2021-04-23 02:47:40 +02:00

blender-admin commented

2021-04-23 09:05:41 +02:00

This issue was referenced by 42089fcde0

This issue was referenced by 42089fcde087b3738312e52820a57504795c69f1

blender-admin commented

2021-04-23 09:05:41 +02:00

This issue was referenced by dc1e98d8a0

This issue was referenced by dc1e98d8a041e161a7bbda97cfac3df57d0ff320

Campbell Barton commented

2021-04-23 09:27:54 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Campbell Barton closed this issue

2021-04-23 09:27:54 +02:00

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Error accessing custom properties? #86765