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[Rust Server] Frunk - LabelledGeneric - support

Merged Administrator requested to merge github/fork/Metaswitch/rust-frunk into master

Created by: richardwhiuk

PR checklist

  • Read the contribution guidelines.
  • Ran the shell script under ./bin/ to update Petstore sample so that CIs can verify the change. (For instance, only need to run ./bin/{LANG}-petstore.sh, ./bin/openapi3/{LANG}-petstore.sh if updating the {LANG} (e.g. php, ruby, python, etc) code generator or {LANG} client's mustache templates). Windows batch files can be found in .\bin\windows\. If contributing template-only or documentation-only changes which will change sample output, be sure to build the project first.
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    • @frol, @farcaller, @bjgill

Description of the PR

Frunk LabelledGeneric support

Derive the LabelledGeneric trait on Swagger models. This allows conversion between structurally similar types by using https://docs.rs/frunk/0.2.2/frunk/#transmogrifying.

This makes it easier to use the models - especially when writing API proxies which convert between two different APIs.

This is an opt in feature on the generated crate. As part of adding the feature, the generated Cargo files have been tidied up.

Authored by @bossmc