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# -*- coding: utf-8 -*-
from __future__ import unicode_literals
from itertools import chain
from django.apps import apps
from django.utils import six
def check_generic_foreign_keys(app_configs=None, **kwargs):
from .fields import GenericForeignKey
if app_configs is None:
models = apps.get_models()
else:
models = chain.from_iterable(app_config.get_models() for app_config in app_configs)
errors = []
fields = (
obj for model in models for obj in six.itervalues(vars(model))
if isinstance(obj, GenericForeignKey)
)
for field in fields:
errors.extend(field.check())
return errors
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