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# -*- coding: utf-8 -*-
from __future__ import unicode_literals
import inspect
import types
from django.apps import apps
from django.core.checks import Error, Tags, register
@register(Tags.models)
def check_all_models(app_configs=None, **kwargs):
errors = []
for model in apps.get_models():
if app_configs is None or model._meta.app_config in app_configs:
if not inspect.ismethod(model.check):
errors.append(
Error(
"The '%s.check()' class method is "
"currently overridden by %r." % (
model.__name__, model.check),
hint=None,
obj=model,
id='models.E020'
)
)
else:
errors.extend(model.check(**kwargs))
return errors
@register(Tags.models, Tags.signals)
def check_model_signals(app_configs=None, **kwargs):
"""
Ensure lazily referenced model signals senders are installed.
"""
# Avoid circular import
from django.db import models
errors = []
for name in dir(models.signals):
obj = getattr(models.signals, name)
if isinstance(obj, models.signals.ModelSignal):
for reference, receivers in obj.unresolved_references.items():
for receiver, _, _ in receivers:
# The receiver is either a function or an instance of class
# defining a `__call__` method.
if isinstance(receiver, types.FunctionType):
description = "The '%s' function" % receiver.__name__
else:
description = "An instance of the '%s' class" % receiver.__class__.__name__
errors.append(
Error(
"%s was connected to the '%s' signal "
"with a lazy reference to the '%s' sender, "
"which has not been installed." % (
description, name, '.'.join(reference)
),
obj=receiver.__module__,
hint=None,
id='signals.E001'
)
)
return errors
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