fix(rust): untagged enum of type-aliases without discriminator

Partially solves OpenAPITools#17869
There is a downside - variants names doesn't reflect model name of reference

It also doesn't solve issue of import, will be solved separately

bin/configs/rust-reqwest-oneOf-alias-type.yaml

@@ -0,0 +1,8 @@
+generatorName: rust
+outputDir: samples/client/others/rust/reqwest/oneOf-aliases
+library: reqwest
+inputSpec: modules/openapi-generator/src/test/resources/3_0/rust/issue_17869_oneOf_aliases.yaml
+templateDir: modules/openapi-generator/src/main/resources/rust
+additionalProperties:
+  supportAsync: false
+  packageName: oneof-reqwest-oneOf-aliases

modules/openapi-generator/src/main/resources/rust/model.mustache

@@ -112,13 +112,16 @@ impl {{{classname}}} {
 {{! TODO: add other vars that are not part of the oneOf}}
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
 #[serde(untagged)]
+{{#description}}
+/// {{{.}}}
+{{/description}}
 pub enum {{classname}} {
-    {{#oneOf}}
+    {{#composedSchemas.oneOf}}
     {{#description}}
     /// {{{.}}}
     {{/description}}
-    {{{.}}}(Box<{{{.}}}>),
-    {{/oneOf}}
+    {{{dataType}}}_{{-index}}(Box<{{{dataType}}}>),
+    {{/composedSchemas.oneOf}}
 }
 
 impl Default for {{classname}} {

modules/openapi-generator/src/test/resources/3_0/rust/issue_17869_oneOf_aliases.yaml

@@ -0,0 +1,42 @@
+{
+  "openapi": "3.0.3",
+  "info": {
+    "title": "Omitted",
+    "description": "Omitted",
+    "license": {
+      "name": ""
+    },
+    "version": "0.1.0"
+  },
+  "servers": [
+    {
+      "url": "http://localhost:8080",
+      "description": "Omitted"
+    }
+  ],
+  "paths": {},
+  "components": {
+    "schemas": {
+      "AccountName": {
+        "type": "string",
+        "description": "An account name."
+      },
+      "AccountOrEmail": {
+        "oneOf": [
+          {
+            "$ref": "#/components/schemas/Email"
+          },
+          {
+            "$ref": "#/components/schemas/AccountName"
+          }
+        ],
+        "description": "Either an account name or an email."
+      },
+      "Email": {
+        "type": "string",
+        "description": "An email address."
+      }
+    },
+    "responses": {}
+  }
+}

samples/client/others/rust/hyper/oneOf/src/models/bar_ref_or_value.rs

@@ -16,8 +16,8 @@ use super::BarRef;
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
 #[serde(untagged)]
 pub enum BarRefOrValue {
-    Bar(Box<Bar>),
-    BarRef(Box<BarRef>),
+    crate::models::Bar_1(Box<crate::models::Bar>),
+    crate::models::BarRef_2(Box<crate::models::BarRef>),
 }
 
 impl Default for BarRefOrValue {

samples/client/others/rust/reqwest/oneOf-aliases/.gitignore

@@ -0,0 +1,3 @@
+/target/
+**/*.rs.bk
+Cargo.lock

samples/client/others/rust/reqwest/oneOf-aliases/.openapi-generator-ignore

@@ -0,0 +1,23 @@
+# OpenAPI Generator Ignore
+# Generated by openapi-generator https://github.com/openapitools/openapi-generator
+
+# Use this file to prevent files from being overwritten by the generator.
+# The patterns follow closely to .gitignore or .dockerignore.
+
+# As an example, the C# client generator defines ApiClient.cs.
+# You can make changes and tell OpenAPI Generator to ignore just this file by uncommenting the following line:
+#ApiClient.cs
+
+# You can match any string of characters against a directory, file or extension with a single asterisk (*):
+#foo/*/qux
+# The above matches foo/bar/qux and foo/baz/qux, but not foo/bar/baz/qux
+
+# You can recursively match patterns against a directory, file or extension with a double asterisk (**):
+#foo/**/qux
+# This matches foo/bar/qux, foo/baz/qux, and foo/bar/baz/qux
+
+# You can also negate patterns with an exclamation (!).
+# For example, you can ignore all files in a docs folder with the file extension .md:
+#docs/*.md
+# Then explicitly reverse the ignore rule for a single file:
+#!docs/README.md

samples/client/others/rust/reqwest/oneOf-aliases/.openapi-generator/FILES

@@ -0,0 +1,11 @@
+.gitignore
+.travis.yml
+Cargo.toml
+README.md
+docs/AccountOrEmail.md
+git_push.sh
+src/apis/configuration.rs
+src/apis/mod.rs
+src/lib.rs
+src/models/account_or_email.rs
+src/models/mod.rs

samples/client/others/rust/reqwest/oneOf-aliases/.openapi-generator/VERSION

@@ -0,0 +1 @@
+7.4.0-SNAPSHOT

samples/client/others/rust/reqwest/oneOf-aliases/.travis.yml

@@ -0,0 +1 @@
+language: rust

samples/client/others/rust/reqwest/oneOf-aliases/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "oneof-reqwest-oneOf-aliases"
+version = "0.1.0"
+authors = ["OpenAPI Generator team and contributors"]
+description = "Omitted"
+license = ""
+edition = "2018"
+
+[dependencies]
+serde = "^1.0"
+serde_derive = "^1.0"
+serde_json = "^1.0"
+url = "^2.2"
+uuid = { version = "^1.0", features = ["serde", "v4"] }
+[dependencies.reqwest]
+version = "^0.11"
+features = ["json", "blocking", "multipart"]

samples/client/others/rust/reqwest/oneOf-aliases/README.md

@@ -0,0 +1,43 @@
+# Rust API client for oneof-reqwest-oneOf-aliases
+
+Omitted
+
+
+## Overview
+
+This API client was generated by the [OpenAPI Generator](https://openapi-generator.tech) project.  By using the [openapi-spec](https://openapis.org) from a remote server, you can easily generate an API client.
+
+- API version: 0.1.0
+- Package version: 0.1.0
+- Build package: `org.openapitools.codegen.languages.RustClientCodegen`
+
+## Installation
+
+Put the package under your project folder in a directory named `oneof-reqwest-oneOf-aliases` and add the following to `Cargo.toml` under `[dependencies]`:
+
+```
+oneof-reqwest-oneOf-aliases = { path = "./oneof-reqwest-oneOf-aliases" }
+```
+
+## Documentation for API Endpoints
+
+All URIs are relative to *http://localhost:8080*
+
+Class | Method | HTTP request | Description
+------------ | ------------- | ------------- | -------------
+
+
+## Documentation For Models
+
+ - [AccountOrEmail](docs/AccountOrEmail.md)
+
+
+To get access to the crate's generated documentation, use:
+
+```
+cargo doc --open
+```
+
+## Author
+
+

samples/client/others/rust/reqwest/oneOf-aliases/docs/AccountOrEmail.md

@@ -0,0 +1,11 @@
+# AccountOrEmail
+
+## Enum Variants
+
+| Name | Description |
+|---- | -----|
+| String | Either an account name or an email. |
+
+[[Back to Model list]](../README.md#documentation-for-models) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to README]](../README.md)
+
+

samples/client/others/rust/reqwest/oneOf-aliases/git_push.sh

@@ -0,0 +1,57 @@
+#!/bin/sh
+# ref: https://help.github.com/articles/adding-an-existing-project-to-github-using-the-command-line/
+#
+# Usage example: /bin/sh ./git_push.sh wing328 openapi-petstore-perl "minor update" "gitlab.com"
+
+git_user_id=$1
+git_repo_id=$2
+release_note=$3
+git_host=$4
+
+if [ "$git_host" = "" ]; then
+    git_host="github.com"
+    echo "[INFO] No command line input provided. Set \$git_host to $git_host"
+fi
+
+if [ "$git_user_id" = "" ]; then
+    git_user_id="GIT_USER_ID"
+    echo "[INFO] No command line input provided. Set \$git_user_id to $git_user_id"
+fi
+
+if [ "$git_repo_id" = "" ]; then
+    git_repo_id="GIT_REPO_ID"
+    echo "[INFO] No command line input provided. Set \$git_repo_id to $git_repo_id"
+fi
+
+if [ "$release_note" = "" ]; then
+    release_note="Minor update"
+    echo "[INFO] No command line input provided. Set \$release_note to $release_note"
+fi
+
+# Initialize the local directory as a Git repository
+git init
+
+# Adds the files in the local repository and stages them for commit.
+git add .
+
+# Commits the tracked changes and prepares them to be pushed to a remote repository.
+git commit -m "$release_note"
+
+# Sets the new remote
+git_remote=$(git remote)
+if [ "$git_remote" = "" ]; then # git remote not defined
+
+    if [ "$GIT_TOKEN" = "" ]; then
+        echo "[INFO] \$GIT_TOKEN (environment variable) is not set. Using the git credential in your environment."
+        git remote add origin https://${git_host}/${git_user_id}/${git_repo_id}.git
+    else
+        git remote add origin https://${git_user_id}:"${GIT_TOKEN}"@${git_host}/${git_user_id}/${git_repo_id}.git
+    fi
+
+fi
+
+git pull origin master
+
+# Pushes (Forces) the changes in the local repository up to the remote repository
+echo "Git pushing to https://${git_host}/${git_user_id}/${git_repo_id}.git"
+git push origin master 2>&1 | grep -v 'To https'

samples/client/others/rust/reqwest/oneOf-aliases/src/apis/configuration.rs

@@ -0,0 +1,53 @@
+/*
+ * Omitted
+ *
+ * Omitted
+ *
+ * The version of the OpenAPI document: 0.1.0
+ * 
+ * Generated by: https://openapi-generator.tech
+ */
+
+
+
+#[derive(Debug, Clone)]
+pub struct Configuration {
+    pub base_path: String,
+    pub user_agent: Option<String>,
+    pub client: reqwest::blocking::Client,
+    pub basic_auth: Option<BasicAuth>,
+    pub oauth_access_token: Option<String>,
+    pub bearer_access_token: Option<String>,
+    pub api_key: Option<ApiKey>,
+    // TODO: take an oauth2 token source, similar to the go one
+}
+
+pub type BasicAuth = (String, Option<String>);
+
+#[derive(Debug, Clone)]
+pub struct ApiKey {
+    pub prefix: Option<String>,
+    pub key: String,
+}
+
+
+impl Configuration {
+    pub fn new() -> Configuration {
+        Configuration::default()
+    }
+}
+
+impl Default for Configuration {
+    fn default() -> Self {
+        Configuration {
+            base_path: "http://localhost:8080".to_owned(),
+            user_agent: Some("OpenAPI-Generator/0.1.0/rust".to_owned()),
+            client: reqwest::blocking::Client::new(),
+            basic_auth: None,
+            oauth_access_token: None,
+            bearer_access_token: None,
+            api_key: None,
+
+        }
+    }
+}