Error when collection visibility property is used in driver expression (fixed in main, backport request) #109570

New Issue

R. C. Randolph · 2023-07-01T00:01:11+02:00

R. C. Randolph commented

2023-07-01 00:01:11 +02:00

System Information
Blender: version: 3.6.0, branch: blender-v3.6-release, commit date: 2023-06-27 08:08, hash: c7fc78b81e
platform: 'macOS-12.6-x86_64-i386-64bit'

Short description of error
When trying to use collection properties as a driver, the following error comes up in the terminal

Failed to add relation "RNA Target -> Driver"
Could not find op_from: RnaPathKey(id: GRCollection, prop: 'hide_viewport')

Trace:

Depth    Type                     Name
-----    ----                     ----
1        Object                   Cube

This appears to be related to #98525, which occurs when the wrong data block type is assigned in the driver. However, collection is correctly assigned in this case.

It looks like the GR in id: GRCollection stands for group, since these first two letters are OB for object drivers, ME for mesh drivers, etc. My guess is somewhere this was supposed to be changed from GR to CL and it's been missed so far.

Exact steps for others to reproduce the error

In the attached file, the cube viewport visibility is supposed to be driven by the collection viewport visibility. It does not update automatically (though it can be convinced to update manually,) and the error above appears on depsgraph update.

**System Information** Blender: version: 3.6.0, branch: blender-v3.6-release, commit date: 2023-06-27 08:08, hash: c7fc78b81ecb platform: 'macOS-12.6-x86_64-i386-64bit' **Short description of error** When trying to use collection properties as a driver, the following error comes up in the terminal ``` Failed to add relation "RNA Target -> Driver" Could not find op_from: RnaPathKey(id: GRCollection, prop: 'hide_viewport') Trace: Depth Type Name ----- ---- ---- 1 Object Cube ``` --------------------------------------------------------------------- This appears to be related to #98525, which occurs when the wrong data block type is assigned in the driver. However, collection is correctly assigned in this case. It looks like the GR in id: GRCollection stands for group, since these first two letters are OB for object drivers, ME for mesh drivers, etc. My guess is somewhere this was supposed to be changed from GR to CL and it's been missed so far. **Exact steps for others to reproduce the error** In the attached file, the cube viewport visibility is supposed to be driven by the collection viewport visibility. It does not update automatically (though it can be convinced to update manually,) and the error above appears on depsgraph update.

collection_name_bug.blend

109 KiB

R. C. Randolph added the

labels 2023-07-01 00:01:11 +02:00

Pratik Borhade commented

2023-07-03 11:20:40 +02:00

Hi, I can confirm the error in console

It looks like the GR in id: GRCollection stands for group... My guess is somewhere this was supposed to be changed from GR to CL and it's been missed so far.

This is not correct though. First two letters of id represents id_type (ID_GR is used for collection) and remaining letter refers to the name of the id (if collection name is col-1, id will be GRcol-1)

Hi, I can confirm the error in console > It looks like the GR in id: GRCollection stands for group... My guess is somewhere this was supposed to be changed from GR to CL and it's been missed so far. This is not correct though. First two letters of id represents id_type ([ID_GR is used for collection](https://projects.blender.org/blender/blender/src/branch/main/source/blender/makesdna/DNA_ID_enums.h#L67)) and remaining letter refers to the name of the id (if collection name is col-1, id will be GRcol-1)

Pratik Borhade commented

2023-07-03 11:36:25 +02:00

Appears to be fixed in 4.0

Pratik Borhade changed title from ~~Driver ID not updated from Group to Collection~~ to Error when collection visibility property is used in driver expression

2023-07-03 11:37:13 +02:00

Pratik Borhade added

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Error when collection visibility property is used in driver expression (fixed in main, backport request) #109570