Fix example to work with Pydantic V2, add test for examples #99
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Summary
examples/departments.py
to comply with changes in how Pydantic handles Optional and null fields.Details
One thing we missed in the review of the PR to add support for pydantic v2: #94, is that the example no longer works and errors out.
This is due to a breaking change in the behavior of Pydantic V2 in regards to optional fields. See this section of the v1 to v2 migration guide, and this long github issue for more discussion on their treatment of optional / nullable fields: pydantic/pydantic#1223