51 lines
1.7 KiB
Python
51 lines
1.7 KiB
Python
from django.conf import settings
|
|
from django.db.models import loading
|
|
from django.utils import importlib
|
|
|
|
|
|
def get_model(label, import_module=True):
|
|
app_label, model_name = label.split('.')
|
|
model = loading.get_model(app_label, model_name)
|
|
if model is None:
|
|
# Sometimes the models module is not yet imported
|
|
for app in settings.INSTALLED_APPS:
|
|
if app.endswith(app_label):
|
|
app_label = app
|
|
importlib.import_module('%s.%s' % (app_label, 'admin'))
|
|
return loading.get_model(*label.split('.'))
|
|
return model
|
|
|
|
|
|
def get_field_value(obj, field_name):
|
|
names = field_name.split('__')
|
|
rel = getattr(obj, names.pop(0))
|
|
for name in names:
|
|
try:
|
|
rel = getattr(rel, name)
|
|
except AttributeError:
|
|
# maybe is a query manager
|
|
rel = getattr(rel.get(), name)
|
|
return rel
|
|
|
|
|
|
def get_model_field_path(origin, target):
|
|
""" BFS search on model relaion fields """
|
|
queue = []
|
|
queue.append(([origin], []))
|
|
while queue:
|
|
model, path = queue.pop(0)
|
|
if len(model) > 4:
|
|
msg = "maximum recursion depth exceeded while looking for %s from %s"
|
|
raise RuntimeError(msg % (target, origin))
|
|
node = model[-1]
|
|
if node == target:
|
|
return path
|
|
for field in node._meta.fields:
|
|
if field.rel:
|
|
new_model = list(model)
|
|
new_model.append(field.rel.to)
|
|
new_path = list(path)
|
|
new_path.append(field.name)
|
|
queue.append((new_model, new_path))
|
|
raise LookupError("Path does not exists between '%s' and '%s' models" % (origin, target))
|