def uninstall_if_needed(setting, value, enter, **kwargs):
"""
Undo the effects of PostgresConfig.ready() when django.contrib.postgres
is "uninstalled" by override_settings().
"""
if (not enter and setting == "INSTALLED_APPS"
and "django.contrib.postgres" not in set(value)):
connection_created.disconnect(register_type_handlers)
CharField._unregister_lookup(Unaccent)
TextField._unregister_lookup(Unaccent)
CharField._unregister_lookup(SearchLookup)
TextField._unregister_lookup(SearchLookup)
CharField._unregister_lookup(TrigramSimilar)
TextField._unregister_lookup(TrigramSimilar)
CharField._unregister_lookup(TrigramWordSimilar)
TextField._unregister_lookup(TrigramWordSimilar)
CharField._unregister_lookup(TrigramStrictWordSimilar)
TextField._unregister_lookup(TrigramStrictWordSimilar)
# Disconnect this receiver until the next time this app is installed
# and ready() connects it again to prevent unnecessary processing on
# each setting change.
setting_changed.disconnect(uninstall_if_needed)
MigrationWriter.unregister_serializer(RANGE_TYPES)
def uninstall_if_needed(setting, value, enter, **kwargs):
"""
Undo the effects of PostgresConfig.ready() when django.contrib.postgres
is "uninstalled" by override_settings().
"""
if not enter and setting == 'INSTALLED_APPS' and 'django.contrib.postgres' not in set(value):
connection_created.disconnect(register_type_handlers)
CharField._unregister_lookup(Unaccent)
TextField._unregister_lookup(Unaccent)
CharField._unregister_lookup(SearchLookup)
TextField._unregister_lookup(SearchLookup)
CharField._unregister_lookup(TrigramSimilar)
TextField._unregister_lookup(TrigramSimilar)
# Disconnect this receiver until the next time this app is installed
# and ready() connects it again to prevent unnecessary processing on
# each setting change.
setting_changed.disconnect(uninstall_if_needed)
