[BUG] [rust-client] Unable to generate rust client for docker api

Created by: pgrinaway

Bug Report Checklist

Have you provided a full/minimal spec to reproduce the issue?
Have you validated the input using an OpenAPI validator (example)?
What's the version of OpenAPI Generator used?
Have you search for related issues/PRs?
What's the actual output vs expected output?
[Optional] Bounty to sponsor the fix (example)

Description

openapi-generator successfully generates an output for the Docker engine v1.39 spec, albeit with a number of warnings such as

[main] WARN  o.o.codegen.DefaultCodegen - codegenModel is null. Default to UNKNOWN_BASE_TYPE

...

[main] WARN  o.o.c.examples.ExampleGenerator - example value (array/primitive) not handled at the moment: [{ID=ktnbjxoalbkvbvedmg1urrz8h, Version={Index=11}, CreatedAt=2016-11-05T01:20:17.327670065Z, UpdatedAt=2016-11-05T01:20:17.327670065Z, Spec={Name=server.conf}}]

Full output here.

Upon attempting to compile the resulting code, there are numerous errors from the Rust compiler such as:

error[E0412]: cannot find type `Value` in this scope
  --> src/apis/container_api.rs:52:76
   |
52 |     fn container_stats(&self, id: &str, stream: bool) -> Box<Future<Item = Value, Error = Error<serde_json::Value>>>;

...

error[E0277]: the trait bound `models::File: serde::Serialize` is not satisfied
  --> src/apis/plugin_api.rs:58:14
   |
58 |             .with_body_param(body)
   |              ^^^^^^^^^^^^^^^ the trait `serde::Serialize` is not implemented for `models::File`

error: aborting due to 25 previous errors

Full compiler output here.

openapi-generator version

(base) Patricks-MBP:test1 pgrinaway$ openapi-generator version
3.3.4

OpenAPI declaration file content or url

The OpenAPI declaration can be found here

Command line used for generation

I ran:

openapi-generator generate -i https://docs.docker.com/engine/api/v1.39/swagger.yaml -g rust -o rust_client/

Using openapi-generator version 3.3.4 on Mac OS X Mojave 10.14.3. Cargo version cargo 1.32.0 (8610973aa 2019-01-02)

Steps to reproduce

Generate the rust code:

mkdir rust_docker && openapi-generator generate -i https://docs.docker.com/engine/api/v1.39/swagger.yaml -g rust -o rust_docker/

Attempt to compile:

cd rust_docker && cargo build

Related issues/PRs

I'm not sure if #2527 is related, since it is trying to also generate a client for this API. Possibly PR #2244 is related, but again I am unsure.

Suggest a fix

I am relatively new to rust, but manually inserting a use serde_json::Value; in the generated code did make the error about the Value go away. However, I'm not quite sure how to fix the other errors.