Get or create function

[carbonarok]

Environment

• DiffSync version: 1.1.0

Ability to either get or create an object like the Django ORM

Function that takes the identifiers of an object and either gets or create an object.
Current work around is wrap an object get in an exception of ObjectNotFound.

Use Case

Currently using try and except to catch if an object already exists.

 try:
 self.add(vrf)
 except ObjectAlreadyExists:
 pass

Expected use

self.get_or_create(vrf)
self.update_or_create(vrf)