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from itertools import chain
from django.apps import apps
from django.core.checks import Error
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 vars(model).values()
if isinstance(obj, GenericForeignKey)
)
for field in fields:
errors.extend(field.check())
return errors
def check_model_name_lengths(app_configs=None, **kwargs):
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 = []
for model in models:
if len(model._meta.model_name) > 100:
errors.append(
Error(
"Model names must be at most 100 characters (got %d)."
% (len(model._meta.model_name),),
obj=model,
id="contenttypes.E005",
)
)
return errors