oso 0.0.3

Breaking changes

Removed arguments to @polar_class decorator

The oso.polar_class() decorator no longer accepts fields or methods arguments. Any field or method defined on the Application Class will be accessible from Polar by default.

Before:

@polar_class(fields=("id", "name", "specialty"), methods=("department", "hospital"))
class Doctor:
    ...

After:

@polar_class
class Doctor:
    ...

Attempt to unify Python instances in Polar results in error

Fix for undefined behavior of application instance unification. Now results in the following error message:

PolarRuntimeException: Invalid operation: cannot unify Python instance objects.

Before:

allow(actor: User, action, resource) if
  actor = resource.owner();

Since actor is an instance of the User application class, any attempt to unify actor (using the = operator) will result in a PolarRuntimeException.

After:

The appropriate way to compare application instance objects is to use field-by-field comparison.

allow(actor: User, action, resource) if
  actor.id = resource.owner().id;

Other bugs & improvements

• Bug fix: Nested logical operators now evaluate appropriately.