Issue with nested file uploads

[blocknotes]

Hey :)
I get this linting error with an endpoint that receives an uploaded file: unknown tag !<!ruby/object:File>

The spec is structured in this way:

    let(:valid_attributes) do
      {
        look_media_attachment: {
          visible: true,
          caption: 'This is the caption text',
          image: fixture_file_upload("#{Rails.root}/spec/fixtures/images/test_image.jpg", 'image/jpeg')
        }
      }
    end

    it do
      post "/api/v1/look_media_attachments.json", params: valid_attributes, headers: auth_credentials
      # ...
    end

The failing output is the following (the error is pointing to the line tmpfile: &1 !ruby/object:File {} below):

      # ...
      requestBody:
        content:
          multipart/form-data:
            schema:
              type: object
              properties:
                look_media_attachment:
                  type: object
                  properties:
                    visible:
                      type: string
                    caption:
                      type: string
                    image:
                      type: string
                      format: binary
            example:
              look_media_attachment:
                visible: 'true'
                caption: This is the caption text
                image: !ruby/object:ActionDispatch::Http::UploadedFile
                  tempfile: !ruby/object:Tempfile
                    unlinked: true
                    mode: 2562
                    tmpfile: &1 !ruby/object:File {}
                    opts:
                      :perm: 384
                    delegate_dc_obj: *1
                  original_filename: test_image.jpg
                  content_type: image/jpeg
                  headers: "Content-Disposition: form-data; name=\"look_media_attachment[image]\";
                    filename=\"test_image.jpg\"\r\nContent-Type: image/jpeg\r\nContent-Length:
                    74165\r\n"
      # ...

---

Investigating a bit...

I think that the problem is here: schema_builder.rb:161
In my example value includes another level look_media_attachment:

{"look_media_attachment"=>
  {"visible"=>"true",
   "caption"=>"This is the caption text",
   "image"=>
    #<ActionDispatch::Http::UploadedFile:0x00007ff2b647c088
     @content_type="image/jpeg",
     @headers="Content-Disposition: form-data; name=\"look_media_attachment[image]\"; filename=\"test_image.jpg\"\r\nContent-Type: image/jpeg\r\nContent-Length: 74165\r\n",
     @original_filename="test_image.jpg",
     @tempfile=#<File:/var/folders/vm/jtxmp1t120b57cfnv0q322kr0000gn/T/RackMultipart20220326-18892-dzbg74.jpg (closed)>>}}

Perhaps in build_example the value hash should be traversed recursively.

[k0kubun]

Same as #44 (comment); could you try preparing a repository that reproduces the issue?

[blocknotes]

Ok, here it is: https://github.com/blocknotes/rspec-openapi/commit/7e357dbd87ddf60380a64f479a711ddaa89a0630

Reproduced with:

OPENAPI=1 bundle exec rspec spec/requests/rails_spec.rb

grep 'ruby/object' spec/rails/doc/openapi.yaml
# data: !ruby/object:ActionDispatch::Http::UploadedFile
#   tempfile: !ruby/object:Tempfile
#     tmpfile: &1 !ruby/object:File {}