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from django.contrib.contenttypes.models import ContentType
from django.db.models import get_apps, get_models, signals
from django.utils.encoding import smart_unicode
def update_contenttypes(app, created_models, verbosity=2, **kwargs):
"""
Creates content types for models in the given app, removing any model
entries that no longer have a matching model class.
"""
ContentType.objects.clear_cache()
app_models = get_models(app)
if not app_models:
return
# They all have the same app_label, get the first one.
app_label = app_models[0]._meta.app_label
app_models = dict(
(model._meta.object_name.lower(), model)
for model in app_models
)
# Get all the content types
content_types = dict(
(ct.model, ct)
for ct in ContentType.objects.filter(app_label=app_label)
)
to_remove = [
ct
for (model_name, ct) in content_types.iteritems()
if model_name not in app_models
]
cts = ContentType.objects.bulk_create([
ContentType(
name=smart_unicode(model._meta.verbose_name_raw),
app_label=app_label,
model=model_name,
)
for (model_name, model) in app_models.iteritems()
if model_name not in content_types
])
if verbosity >= 2:
for ct in cts:
print "Adding content type '%s | %s'" % (ct.app_label, ct.model)
# Confirm that the content type is stale before deletion.
if to_remove:
if kwargs.get('interactive', False):
content_type_display = '\n'.join([
' %s | %s' % (ct.app_label, ct.model)
for ct in to_remove
])
ok_to_delete = raw_input("""The following content types are stale and need to be deleted:
%s
Any objects related to these content types by a foreign key will also
be deleted. Are you sure you want to delete these content types?
If you're unsure, answer 'no'.
Type 'yes' to continue, or 'no' to cancel: """ % content_type_display)
else:
ok_to_delete = False
if ok_to_delete == 'yes':
for ct in to_remove:
if verbosity >= 2:
print "Deleting stale content type '%s | %s'" % (ct.app_label, ct.model)
ct.delete()
else:
if verbosity >= 2:
print "Stale content types remain."
def update_all_contenttypes(verbosity=2, **kwargs):
for app in get_apps():
update_contenttypes(app, None, verbosity, **kwargs)
signals.post_syncdb.connect(update_contenttypes)
if __name__ == "__main__":
update_all_contenttypes()
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