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@MercMayhem MercMayhem commented Feb 11, 2026

Added a section for when the file field is an array. If it is an array, we iterate through the files and use the same logic we had before to add it to the form. Modified it for both async and non async sections. Ran the tests with the following parameters with example mentioned in #22900. Fixes #22900 @frol @farcaller @richardwhiuk @paladinzh @jacob-pro @dsteeley :

supportAsync = true

      "SendReport": {
        "required": [
          "context",
          "data",
          "reason",
          "type"
        ],
        "type": "object",
        "properties": {
          "type": {
            "$ref": "#/components/schemas/ReportTypeEnum"
          },
          "reason": {
            "minLength": 1,
            "type": "string"
          },
          "context": {
            "minLength": 1,
            "type": "string"
          },
          "data": {
            "minLength": 1,
            "type": "string"
          },
          "files": {
            "type": "string",
            "format": "binary"
          }
        },
        "additionalProperties": false
      },
      "SendReport": {
        "required": [
          "context",
          "data",
          "reason",
          "type"
        ],
        "type": "object",
        "properties": {
          "type": {
            "$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
      },
      "SendReport": {
        "required": [
          "context",
          "data",
          "reason",
          "type",
          "files"
        ],
        "type": "object",
        "properties": {
          "type": {
            "$ref": "#/components/schemas/ReportTypeEnum"
          },
          "reason": {
            "minLength": 1,
            "type": "string"
          },
          "context": {
            "minLength": 1,
            "type": "string"
          },
          "data": {
            "minLength": 1,
            "type": "string"
          },
          "files": {
            "type": "string",
            "format": "binary"
          }
        },
        "additionalProperties": false
      },
      "SendReport": {
        "required": [
          "context",
          "data",
          "reason",
          "type",
          "files"
        ],
        "type": "object",
        "properties": {
          "type": {
            "$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
      },

supportAsync = false

      "SendReport": {
        "required": [
          "context",
          "data",
          "reason",
          "type",
          "files"
        ],
        "type": "object",
        "properties": {
          "type": {
            "$ref": "#/components/schemas/ReportTypeEnum"
          },
          "reason": {
            "minLength": 1,
            "type": "string"
          },
          "context": {
            "minLength": 1,
            "type": "string"
          },
          "data": {
            "minLength": 1,
            "type": "string"
          },
          "files": {
            "type": "string",
            "format": "binary",
            "nullable": false
          }
        },
        "additionalProperties": false
      },
      "SendReport": {
        "required": [
          "context",
          "data",
          "reason",
          "type",
          "files"
        ],
        "type": "object",
        "properties": {
          "type": {
            "$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"
            },
            "nullable": false
          }
        },
        "additionalProperties": false
      },
      "SendReport": {
        "required": [
          "context",
          "data",
          "reason",
          "type",
          "files"
        ],
        "type": "object",
        "properties": {
          "type": {
            "$ref": "#/components/schemas/ReportTypeEnum"
          },
          "reason": {
            "minLength": 1,
            "type": "string"
          },
          "context": {
            "minLength": 1,
            "type": "string"
          },
          "data": {
            "minLength": 1,
            "type": "string"
          },
          "files": {
            "type": "string",
            "format": "binary",
            "nullable": true
          }
        },
        "additionalProperties": false
      },
      "SendReport": {
        "required": [
          "context",
          "data",
          "reason",
          "type",
          "files"
        ],
        "type": "object",
        "properties": {
          "type": {
            "$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"
            },
            "nullable": true
          }
        },
        "additionalProperties": false
      },
      "SendReport": {
        "required": [
          "context",
          "data",
          "reason",
          "type"
        ],
        "type": "object",
        "properties": {
          "type": {
            "$ref": "#/components/schemas/ReportTypeEnum"
          },
          "reason": {
            "minLength": 1,
            "type": "string"
          },
          "context": {
            "minLength": 1,
            "type": "string"
          },
          "data": {
            "minLength": 1,
            "type": "string"
          },
          "files": {
            "type": "string",
            "format": "binary"
          }
        },
        "additionalProperties": false
      },
      "SendReport": {
        "required": [
          "context",
          "data",
          "reason",
          "type"
        ],
        "type": "object",
        "properties": {
          "type": {
            "$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
      },

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Summary by cubic

Fixes incorrect handling of multipart file arrays in Rust reqwest clients. When a form field is Vec, each file is now added to the multipart body in both async and sync paths. Fixes #22900.

  • Bug Fixes
    • Added isArray handling in api.mustache for file params: iterate values and add a part per file.
    • Implemented matching logic for required/optional and nullable cases in both supportAsync=true/false.
    • Updated generated samples to reflect the new multipart behavior.

Written for commit 76bd2e5. Summary will update on new commits.

@MercMayhem MercMayhem marked this pull request as ready for review February 11, 2026 08:27
@MercMayhem MercMayhem mentioned this pull request Feb 11, 2026
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1 issue found across 7 files

Prompt for AI agents (all issues)

Check if these issues are valid — if so, understand the root cause of each and fix them.


<file name="modules/openapi-generator/src/main/resources/rust/reqwest/api.mustache">

<violation number="1" location="modules/openapi-generator/src/main/resources/rust/reqwest/api.mustache:408">
P2: Async multipart handling for required nullable file arrays iterates over `&Option<Vec<PathBuf>>` without unwrapping, producing `&Vec<PathBuf>` loop values that cannot be opened as paths; this causes compile errors for required nullable file arrays.</violation>
</file>

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{{#required}}
{{^isNullable}}
{{#isArray}}
for value in &{{{vendorExtensions.x-rust-param-identifier}}} {
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P2: Async multipart handling for required nullable file arrays iterates over &Option<Vec<PathBuf>> without unwrapping, producing &Vec<PathBuf> loop values that cannot be opened as paths; this causes compile errors for required nullable file arrays.

Prompt for AI agents
Check if this issue is valid — if so, understand the root cause and fix it. At modules/openapi-generator/src/main/resources/rust/reqwest/api.mustache, line 408:

<comment>Async multipart handling for required nullable file arrays iterates over `&Option<Vec<PathBuf>>` without unwrapping, producing `&Vec<PathBuf>` loop values that cannot be opened as paths; this causes compile errors for required nullable file arrays.</comment>

<file context>
@@ -404,37 +404,85 @@ pub {{#supportAsync}}async {{/supportAsync}}fn {{{operationId}}}(configuration:
     {{#required}}
     {{^isNullable}}
+    {{#isArray}}
+    for value in &{{{vendorExtensions.x-rust-param-identifier}}} {
+        multipart_form = multipart_form.file("{{{baseName}}}", value)?;
+    }
</file context>
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@wing328
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wing328 commented Feb 11, 2026

thanks for the PR

if no feedback/question from anyone, i'll try to merge it later this week

@wing328 wing328 added this to the 7.20.0 milestone Feb 11, 2026
@wing328 wing328 merged commit d47ab0f into OpenAPITools:master Feb 12, 2026
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[BUG][Rust] multiple files

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