def test_load_bad_config(database: Database) -> None:
"is an error thrown if a bad config is read from the database"
example_bad_json: str = random_json()
# Prove the example_bad_json is not a valid configuration structure
with pytest.raises(pydantic.ValidationError) as err:
CommonSettings.parse_raw(example_bad_json)
with db_session:
database.ConfigEntity(version="current",
json=example_bad_json,
class_name=CommonSettings.__name__)
database.commit()
with pytest.raises(BadConfigInDBError) as err:
get_config(db=database)
assert "bad configuration in database" in str(err.value)
def save_config(db: Database, new_settings: CommonSettings) -> CommonSettings:
"encodes the settings and writes them to the database"
bad_class_msg = "new_settings must be an instance of a settings class"
try:
class_name = SettingsClassName.validate(
new_settings.__class__.__name__)
except ValidationError as err:
raise ValueError(bad_class_msg) from err
settings_class = getattr(settings, class_name)
if settings_class != type(new_settings):
raise ValueError(bad_class_msg)
with db_session:
config_entity = db.ConfigEntity(version="current",
class_name=class_name,
json=new_settings.json())
return settings_class.parse_raw(config_entity.json)
