“bpy.context.scene.object_bases” not working in 2.80?

Question

The 2.8 documentation for the context override is found here: https://docs.blender.org/api/blender2.8/bpy.ops.html?highlight=object_bases

override['selected_bases'] = list(bpy.context.scene.object_bases)

is even listed there, but throwing

bpy.context.scene.object_bases

into the python console throws:

Traceback (most recent call last): File "", line 1, in AttributeError: 'Scene' object has no attribute 'object_bases'

I want to merge objects as described by CodemanX here: How to join objects with Python? It worked in 2.79, doesnt in 2.80 and throws:

AttributeError: 'Scene' object has no attribute 'object_bases'

My code snippet:

    proxyname = "ProxyName"
    # create empty new object
    proxymesh = bpy.data.objects.new(proxyname, bpy.data.meshes.new(proxyname))
    bpy.context.collection.objects.link(proxymesh)
    proxymesh.matrix_world = bpy.context.active_object.matrix_world
    # make new, flattened object from all meshes in selection
    duplicants = []
    duplicants.append(proxymesh)
    for obj in bpy.context.selected_objects:
        if obj.type == "MESH":
            duplicant = bpy.data.objects.new("duplicant", obj.to_mesh(bpy.context.depsgraph, True, calc_undeformed=False))
            bpy.context.collection.objects.link(duplicant)
            duplicant.matrix_world = obj.matrix_world
            duplicants.append(duplicant)
    # attach flattened objects to empty object
    ctx = bpy.context.copy()
    ctx['active_object'] = proxymesh
    ctx['selected_objects'] = duplicants
    ctx['selected_editable_bases'] = [bpy.context.scene.object_bases[duplicant.name] for duplicant in duplicants]

So basically, I would like to know how to be able to iterate through the scene's object bases in 2.80?

Answer 1

Appears no need for bases in 2.8 join operator override.

Testing this in python console. Have duped the default cube 3 times, the last dupe "Cube.003" is active and only object selected.

>>> C.object
bpy.data.objects['Cube.003']


>>> C.selected_objects
[bpy.data.objects['Cube.003']]

A list of all the mesh objects in scene to join

>>> obs = [o for o in C.scene.objects if o.type == 'MESH']
>>> obs
[bpy.data.objects['Cube'], bpy.data.objects['Cube.001'], bpy.data.objects['Cube.002'], bpy.data.objects['Cube.003']]

Make a context override dictionary, with only object, active_object, selected_objects, selected_editable_objects as members (possibly don't require "object")

>>> c = {}

>>> c["object"] = c["active_object"] = C.object
>>> c["selected_objects"] = c["selected_editable_objects"] = obs

Run the operator with this override

>>> bpy.ops.object.join(c)
{'FINISHED'}

Resulting scene after running. All four cubes are joined as one "Cube.003"

>>> C.scene.objects[:]
[bpy.data.objects['Lamp'], bpy.data.objects['Camera'], bpy.data.objects['Cube.003']]

Risky look at obs since three of the objects no longer exist.

>>> obs
[<bpy_struct, Object invalid>, <bpy_struct, Object invalid>, <bpy_struct, Object invalid>, bpy.data.objects['Cube.003']]

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Answer 2

Try to change active Collection , in "Master collection" i try to select default "Collection" and this script not work(why i dont know) , but in another child collection it works. for me this work but not in principal collectio (this script is modified , is by CodemanX, i select first object by another way :

import bpy

scene = bpy.context.scene.collection 

obs = []
for ob in scene.objects:

    if ob.type == 'MESH':
        obs.append(ob)

ctx = bpy.context.copy()

ctx['selected_editable_bases'] = [scene.object_bases[ob.name] for ob in obs]

bpy.ops.object.join(ctx)

Answer 3

i found solution for problem: this is for children of an object, i create mesh empty object first "null", children are object children of 1 object now is very fast. in your case follow this example and change your object

obs = []
null.select_set(state=True)
obs.append(null)
for c in children:


    c.select_set(state=True)
    obs.append(c)      



ctx = bpy.context.copy()
ctx['active_object'] = obs[0]
ctx['selected_objects'] = obs



bpy.ops.object.join(ctx)