[BUG] std::option::Option<&str> cannot be formatted with the default formatter

[mickvangelderen]

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
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Description

I'm using the rust generator to generate a client for our kubernetes API server.

The generated client code fails to compile with:

error[E0277]: `std::option::Option<&str>` doesn't implement `std::fmt::Display`
    --> kubernetes-client/src/apis/core_v1_api.rs:3872:67
     |
3872 |     let local_var_uri_str = format!("{}/api/v1/nodes/{name}/proxy/{path}", local_var_configuration.base_path, name=crate::apis::urlencode(name));
     |                                                                   ^^^^^^ `std::option::Option<&str>` cannot be formatted with the default formatter

The generated code:

/// connect POST requests to proxy of Node
pub async fn connect_core_v1_post_node_proxy_with_path(configuration: &configuration::Configuration, name: &str, path: Option<&str>) -> Result<String, Error<ConnectCoreV1PostNodeProxyWithPathError>> {
    let local_var_configuration = configuration;

    let local_var_client = &local_var_configuration.client;

    let local_var_uri_str = format!("{}/api/v1/nodes/{name}/proxy/{path}", local_var_configuration.base_path, name=crate::apis::urlencode(name));
    let mut local_var_req_builder = local_var_client.request(reqwest::Method::POST, local_var_uri_str.as_str());
   
    // ...
}

openapi-generator version

Happens on:

• 7.10.0
• 7.11.0-SNAPSHOT

OpenAPI declaration file content or url

Can't share but it is a Kubernetes OpenAPI V2 spec.

Generation Details

docker run --rm --network=host -v ${PWD}:/local openapitools/openapi-generator-cli \
    generate \
    -i https://apiserver/openapi/v2 \
    -g rust \
    -o /local \
    --additional-properties=packageName=kubernetes-client,packageVersion=0.1.0

Steps to reproduce

Related issues/PRs

• [BUG][RUST][CLIENT] Generated enum type used with format! but it doesn't impl Display #16975

Suggest a fix

Perhaps the last part of the URL /{path} or just {path} (not the slash) should be left off if path is None.