PATCH vs PUT and optional fields vs "required-but-nullable" fields

[Marc-Andrieu]

There's no such thing as a "Draft issue" so feel free to close this one if you feel I'm saying bullsh*t

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We do not use a single PUT endpoint (no orange in the swagger):

• violates the REST principles
• makes no distinction between sending sparse fields to edit an object (PATCH) and sending a whole object to add it (overwrite the old one)

Reference : https://stackoverflow.com/questions/28459418/use-of-put-vs-patch-methods-in-rest-api-real-life-scenarios

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Pydantic has exclude_unset to distinguish the fields that have the default value because unset, from the fields that have the default value intentionally.
In a Pydantic object, all fields are required, in that they must be defined (have a value), even if it's the default one, most often None, and we signify that a field is not required by having a default None. And when "destructuring" it to pass the dump of the values as arguments (of a CRUD), we exclude None values from the dump with exclude_none.
So there's a confusion between the fields we declare unrequired in the endpoints, from the fields we don't want to pass down to CRUDs.

Reference : https://docs.pydantic.dev/1.10/usage/exporting_models