Currently, objects that inherit from Dataset instance can be initialized without root_dir properly set. In such case, its value is set to DUMMY_NONEXISTING_PATH (constants module) which is a path object meant to substitute None value.
When any operation that involves serialization occurs on the dataset, it is checked that root_dir was properly set by @serialize decorator which raises an exception in case it was not yet set.
What we're trying to achieve is basically None behaviour that could be somewhat tricky to handle with MyPy. ATM, we take the advantage of root_dir always being a Path instance. We should, however, replace DUMMY_NONEXISTING_PATH with None in the future. For some rationale, see https://github.com/crocs-muni/sec-certs/pull/275/commits#discussion_r1042430764
Currently, objects that inherit from
Datasetinstance can be initialized withoutroot_dirproperly set. In such case, its value is set toDUMMY_NONEXISTING_PATH(constants module) which is a path object meant to substituteNonevalue.When any operation that involves serialization occurs on the dataset, it is checked that
root_dirwas properly set by@serializedecorator which raises an exception in case it was not yet set.What we're trying to achieve is basically
Nonebehaviour that could be somewhat tricky to handle with MyPy. ATM, we take the advantage ofroot_diralways being aPathinstance. We should, however, replaceDUMMY_NONEXISTING_PATHwithNonein the future. For some rationale, see https://github.com/crocs-muni/sec-certs/pull/275/commits#discussion_r1042430764