fix Multipart/form-data example object to filename

lib/rspec/openapi/schema_builder.rb

@@ -72,7 +72,7 @@ def build_request_body(record)
       content: {
         normalize_content_type(record.request_content_type) => {
           schema: build_property(record.request_params),
-          example: (record.request_params if example_enabled?),
+          example: (build_example(record.request_params) if example_enabled?),
         }.compact
       }
     }
@@ -126,6 +126,19 @@ def try_cast(value)
     end
   end
 
+  def build_example(value)
+    return nil if value.nil?
+    examples = {}
+    value.each do |key, v|
+      if v.is_a? ActionDispatch::Http::UploadedFile
+        examples[key] = v.original_filename
+      else
+        examples[key] = v
+      end
+    end
+    examples
+  end
+
   def normalize_path(path)
     path.gsub(%r|/:([^:/]+)|, '/{\1}')
   end

spec/rails/doc/openapi.yaml

@@ -226,18 +226,7 @@ paths:
                   type: string
                   format: binary
             example:
-              image: !ruby/object:ActionDispatch::Http::UploadedFile
-                tempfile: !ruby/object:Tempfile
-                  unlinked: true
-                  mode: 194
-                  tmpfile: &1 !ruby/object:File {}
-                  opts:
-                    :perm: 384
-                  delegate_dc_obj: *1
-                original_filename: test.png
-                content_type: image/png
-                headers: "Content-Disposition: form-data; name=\"image\"; filename=\"test.png\"\r\nContent-Type:
-                  image/png\r\nContent-Length: 71\r\n"
+              image: test.png
       responses:
         '200':
           description: returns a table