Patch struct helper

[jayvdb]

A HTTP PATCH operation submits a subset of fields to the endpoint, so body: Json<SchemaA> isnt appropriate.

In Django REST Framework, there is builtin support for partial updates being performed by PATCH where mandatory-ness is dropped on the HTTP deserialisation, but other validation is maintained. [https://www.google.com/search?client=firefox-b-d&q=django+DRF+PATCH+updates] if you care to go down that rabbit hole to see how they do it.

It would be nice if there was some helper for actix-web that assisted with this, and it might be as simple as a derived-struct-generator which can be used like PatchedSchemaA = PatchableHelper(SchemaA, mandatory=["id_field"], patchable=["field3", "field7"]), so then body: Json<PatchedSchemaA> is usable for patch operations. e.g. https://crates.io/crates/optional_struct would be a good starting point . But is there a better solution? It looks quite new and has a lot of TODOs.

Perhaps adding an example of an actix-web patch endpoint with optional_struct (or similar) would be helpful?