Add support for Pydantic V2 x OpenAPI 3 #22
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Pydantic V2 uses `$defs` key in its schema.
Cannot call schema directly on BaseModel in Pydantic V2
Cannot call schema directly on BaseModel in Pydantic V2
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Solves #18
Pydantic V2 uses
$defskey in its schema. This adds support for the new key while still working with the olddefinitionskey.Credit to https://github.com/kkirsche/apispec-pydantic-plugin and I think their repo should be integrated with this repo as it provides a more up-to-date Pydantic plugin for APISpec. But while that happens, it would be great if this fix could go forward to make it possible for the package to be used with Pydantic V2.
Additionally, this also fixes the tests not running. Pydantic does not allow calling the
schemaon theBaseModeldirectly, only on subclasses.