Register collectionproperty to object instead scene

Coding Python Support
1

Hi, I just play around with python and now I want to register a list to Objects instead of Scene.

When I do this:

bpy.types.Scene.my_list = bpy.props.CollectionProperty(type = ListItem)

I can draw the list with this code

        scene = context.scene
        row = layout.row()
        row.template_list("MY_UL_List", "The_List", scene,
                          "my_list", scene, "list_index")

This works fine.

As I understand the list is now registered to the sole scene.
However, I want it to be the list of a single object, so every object can have its own scene.

So I thought it would go like this:

bpy.types.Object.my_list = bpy.props.CollectionProperty(type = ListItem)

and

        scene = context.active_object
        row = layout.row()
        row.template_list("MY_UL_List", "The_List", scene,
                          "my_list", scene, "list_index")

But now this list isn’t showing in my panel.

Whats my misconception here?

2

Yeh, never mind… it was so easy.

3

What did you do to fix this problem? This information will be helpful to anyone who comes across this thread in the future :slight_smile:

4

Ok,

so this line was correct, its how you do it:

bpy.types.Object.my_list = bpy.props.CollectionProperty(type = ListItem)

However, I changed the second codeblock to this.
Instead of scene = context.active_object I now use

obj = context.object

And also didnt use the scene as variable name.

        obj = context.object
        row = layout.row()
        row.template_list("MY_UL_List", "The_List", obj,
                          "my_list", obj, "list_index")

So I will find the list in context.object and not in context.active_object …

I hope I understood this right, however… it works!

1 Like
5

AFAIK context.object and context.active_object point to the same object (or to None if there is none) under the hood so I think your error was located elsewhere. And according to the devs (can’t find the source) the latter is the preferred syntax. Food for thought.

2 Likes
6

Hmm. Indeed… Mind Food… What else have I changed. I will think about it…
Changed so much recently