Blender 2.8 API, python, set active object

Question

I'm trying to amend an addon that I made for Blender 2.7X to work with Blender 2.80.
The problem is with

bpy.context.scene.objects.active = some_object

This is how I used to set an active object, the problem is, active property was removed in the new API!,reading other Q&As, I found 2 suggestions:

bpy.context.object

and

bpy.context.active_object

The problem is, both of these will return the already active object, but when I try to use them this way:

bpy.context.active_object = some_object

or

bpy.context.object = some_object

I'm getting an AttributeError: property is read-only!

I tried the documentation with no luck!

EDIT:

bpy.context.scene.objects.active

changed into

bpy.context.render_layer.objects.active

This doesn't work, AttributeError: 'Context' object has no attribute 'render_layer'

batFINGER · Accepted Answer · 2020-08-10 12:16:05Z

59

Use the view_layer

Set ViewLayer.active to any object in view layer or None

context.view_layer.objects.active = ob

Note selecting has also changed from ob.select = True to

ob.select_set(True)

which together will emulate the general case UI state of having the context object both active and selected.

answered Dec 19, 2018 at 15:23

batFINGER

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3

$\begingroup$ Great, many thanks @batFINGER, may I ask, how did you figure it out, even the wiki changes got it wrong! $\endgroup$
– Georges D
Dec 19, 2018 at 15:32
3

$\begingroup$ Upgrading scripts. Read that wiki a while back and remembered it was a context.somelayer.objects.active but not which one lol. Pecking around in API in py console, looking for active prop on some of new type context layers objects collection, and on view_layer bingo. Have a feeling it has been answered here before too. $\endgroup$
– batFINGER
Dec 19, 2018 at 15:54
2

$\begingroup$ Lol, I guess hacking skills are required to properly read the API $\endgroup$
– Georges D
Dec 19, 2018 at 16:01
2

$\begingroup$ Wouldn't be able to do it without your help @batFINGER many thanks! github.com/sergeod9/Easy_Align_Addon/blob/master/… $\endgroup$
– Georges D
Dec 19, 2018 at 17:59

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