[BUG][Rust] multiple files

[MichalNemec]

Bug Report Checklist

• [ x] Have you provided a full/minimal spec to reproduce the issue?
• [x ] Have you validated the input using an OpenAPI validator?
• [x ] Have you tested with the latest master to confirm the issue still exists?
• [ x] Have you searched for related issues/PRs?
• [x ] What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

Rust generator is not generating code properly for multipart with multiple files

openapi-generator version

7.19.9

OpenAPI declaration file content or url

{
  "openapi": "3.0.4",
  "info": {
    "title": "x",
    "description": "x",
    "termsOfService": "https://x",
    "contact": {
      "name": "x",
      "url": "https://x"
    },
    "license": {
      "name": "License",
      "url": "https://x"
    },
    "version": "v1"
  },
  "paths": {
    "/api/report/send": {
      "post": {
        "tags": [
          "Report"
        ],
        "operationId": "SendReport",
        "requestBody": {
          "content": {
            "multipart/form-data": {
              "schema": {
                "$ref": "#/components/schemas/SendReport"
              }
            }
          }
        },
        "responses": {
          "200": {
            "description": "OK",
            "content": {
              "application/json": {
                "schema": {
                  "type": "integer",
                  "format": "int32"
                }
              }
            }
          },
          "401": {
            "description": "Unauthorized",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ErrorDto"
                }
              }
            }
          },
          "403": {
            "description": "Forbidden",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ErrorDto"
                }
              }
            }
          },
          "400": {
            "description": "Bad Request",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ErrorDto"
                }
              }
            }
          },
          "500": {
            "description": "Internal Server Error",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ErrorDto"
                }
              }
            }
          }
        }
      }
    }
  },
  "components": {
    "schemas": {
      "ErrorDto": {
        "type": "object",
        "properties": {
          "statusCode": {
            "type": "integer",
            "format": "int32"
          },
          "exception": {
            "type": "string",
            "nullable": true
          },
          "message": {
            "type": "string",
            "nullable": true
          }
        },
        "additionalProperties": false
      },
      "SendReport": {
        "required": [
          "context",
          "data",
          "files",
          "reason",
          "type"
        ],
        "type": "object",
        "properties": {
          "type": {
            "$ref": "#/components/schemas/ReportTypeEnum"
          },
          "reason": {
            "minLength": 1,
            "type": "string"
          },
          "context": {
            "minLength": 1,
            "type": "string"
          },
          "data": {
            "minLength": 1,
            "type": "string"
          },
          "files": {
            "type": "array",
            "items": {
              "type": "string",
              "format": "binary"
            }
          }
        },
        "additionalProperties": false
      },
      "ReportTypeEnum": {
        "enum": [
          "Event",
          "Room",
          "Comment",
          "User"
        ],
        "type": "string"
      }
    }
  },
  "tags": [
    {
      "name": "Report"
    }
  ]
}

Generation Details

"generator-cli": {
    "version": "7.19.0",
    "generators": {
      "v2.0": {
        "generatorName": "rust",
        "output": "./rust/openapi",
        "inputSpec": "./swagger.json",
        "additionalProperties": {
          "packageVersion": "1.0.0",
          "library": "reqwest",
          "reqwestDefaultFeatures": "rustls-tls",
          "useSerdePathToError": true,
          "supportAsync": true,
          "useEnumExtensions": true,
          "ensureUniqueParams": false,
          "enumUnknownDefaultCase": true,
          "useSingleRequestParameter": true,
          "prependFormOrBodyParameters": false
        },
        "globalProperty": {
          "skipFormModel": false
        }
      }
    }
  }

Steps to reproduce

run it and expect in generated code error

the trait bound `Vec<PathBuf>: AsRef<std::path::Path>` is not satisfied
the following other types implement trait `AsRef<T>`:
  `Vec<T, A>` implements `AsRef<Vec<T, A>>`
  `Vec<T, A>` implements `AsRef<[T]>`
required for `&Vec<PathBuf>` to implement `AsRef<std::path::Path>

Suggest a fix

from:

let file = TokioFile::open(&params.files).await?;
    let stream = FramedRead::new(file, BytesCodec::new());
    let file_name = params.files.file_name().map(|n| n.to_string_lossy().to_string()).unwrap_or_default();
    let file_part = reqwest::multipart::Part::stream(reqwest::Body::wrap_stream(stream)).file_name(file_name);
    multipart_form = multipart_form.part("files", file_part);

to:

for path in p_form_files {
        let file = TokioFile::open(&path).await.map_err(|e| Error::from(serde_json::Error::custom(format!("File open error: {e}"))))?;
        let file_name = path.file_name()
            .map(|n| n.to_string_lossy().to_string())
            .unwrap_or_else(|| "file".into());

        let stream = FramedRead::new(file, BytesCodec::new());
        let file_part = reqwest::multipart::Part::stream(reqwest::Body::wrap_stream(stream))
            .file_name(file_name);

        // Use "files[]" if your backend expects an array, or "files" if it handles multiple parts with the same name
        multipart_form = multipart_form.part("files", file_part);
    }

[MercMayhem]

hi @MichalNemec . I have updated the template files to fix this in this pr:

#22942