Avalon example for colorbleed-config on how to load latest version of an asset's `modelDefault` solely from the `cbId` attribute.

avalon_load_by_cbid.py

# Example on how to load latest `modelDefault` of an asset by `cbId` value using `AbcLoader` (alembic)
import avalon.io as io
import avalon.api as api
from maya import cmds

node = "my_node"
cbid = cmds.getAttr("%s.cbId" % node)

# Get asset object id from cbId
object_id = cbid.split(":", 1)[0]    # The part before the : is the asset id
object_id = io.ObjectId(object_id)   # Make sure it's a pymongo.ObjectId to query the database

asset = io.find_one({"_id": object_id, 
                     "type": "asset"})
subset = io.find_one({"name": "modelDefault",
                      "parent": asset["_id"],    
                      "type": "subset"})
version = io.find_one({"parent": subset["_id"],
                       "type": "version"}, sort=[("name", -1)])
representation = io.find_one({"name": "abc",
                              "parent": version["_id"],
                              "type": "representation"})

# From all loader get the AbcLoader
loaders = api.discover(api.Loader)
loader = {loader.__name__: loader for loader in loaders}.get("AbcLoader")

api.load(loader, representation)

To not use a Loader but just get the Representation path use avalon.api.get_representation_path()

import avalon.api as api
path = api.get_representation_path(representation)