Fixes #22900

Author: Am-an-R

modules/openapi-generator/src/main/resources/rust/reqwest/api.mustache

@@ -422,19 +422,41 @@ pub {{#supportAsync}}async {{/supportAsync}}fn {{{operationId}}}(configuration:
     {{#supportAsync}}
     {{^required}}
     if let Some(ref param_value) = {{{vendorExtensions.x-rust-param-identifier}}} {
-        let file = TokioFile::open(param_value).await?;
+        {{#isArray}}
+                for value in param_value {
+                let file = TokioFile::open(value).await?;
+                let stream = FramedRead::new(file, BytesCodec::new());
+                let file_name = value.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("{{{baseName}}}", file_part);
+                }
+        {{/isArray}}
+        {{^isArray}}
+                let file = TokioFile::open(param_value).await?;
+                let stream = FramedRead::new(file, BytesCodec::new());
+                let file_name = param_value.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("{{{baseName}}}", file_part);
+        {{/isArray}}
+    }
+    {{/required}}
+    {{#required}}
+    {{#isArray}}
+    for value in &{{{vendorExtensions.x-rust-param-identifier}}} {
+        let file = TokioFile::open(value).await?;
         let stream = FramedRead::new(file, BytesCodec::new());
-        let file_name = param_value.file_name().map(|n| n.to_string_lossy().to_string()).unwrap_or_default();
+        let file_name = value.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("{{{baseName}}}", file_part);
     }
-    {{/required}}
-    {{#required}}
-    let file = TokioFile::open(&{{{vendorExtensions.x-rust-param-identifier}}}).await?;
+    {{/isArray}}
+    {{^isArray}}
+    let file = TokioFile::open({{{vendorExtensions.x-rust-param-identifier}}}).await?;
     let stream = FramedRead::new(file, BytesCodec::new());
     let file_name = {{{vendorExtensions.x-rust-param-identifier}}}.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("{{{baseName}}}", file_part);
+    {{/isArray}}
     {{/required}}
     {{/supportAsync}}
     {{/isFile}}