41 lines
1.3 KiB
Python
41 lines
1.3 KiB
Python
from django.core.exceptions import ObjectDoesNotExist
|
|
|
|
from orchestra.apps.accounts.models import Account
|
|
from orchestra.core import services
|
|
|
|
|
|
def get_related_object(origin, max_depth=2):
|
|
"""
|
|
Introspects origin object and return the first related service object
|
|
|
|
WARNING this is NOT an exhaustive search but a compromise between cost and
|
|
flexibility. A more comprehensive approach may be considered if
|
|
a use-case calls for it.
|
|
"""
|
|
def related_iterator(node):
|
|
for field in node._meta.virtual_fields:
|
|
if hasattr(field, 'ct_field'):
|
|
yield getattr(node, field.name)
|
|
for field in node._meta.fields:
|
|
if field.rel:
|
|
try:
|
|
yield getattr(node, field.name)
|
|
except ObjectDoesNotExist:
|
|
pass
|
|
|
|
# BFS model relation transversal
|
|
queue = [[origin]]
|
|
while queue:
|
|
models = queue.pop(0)
|
|
if len(models) > max_depth:
|
|
return None
|
|
node = models[-1]
|
|
if len(models) > 1:
|
|
if type(node) in services:
|
|
return node
|
|
for related in related_iterator(node):
|
|
if related and related not in models:
|
|
new_models = list(models)
|
|
new_models.append(related)
|
|
queue.append(new_models)
|