ActionDispatch Http UploadedFile #to_io attribute to_io Ruby on Rails 5.0.7.2 Since v4.2.11.3 Last seen in v5.2.8.1 Available in: v4.2.11.3 v5.0.7.2 v5.1.7 v5.2.8.1 Compare with: (choosing a version navigates to the comparison) Choose a version v4.2.11.3 · same v5.1.7 · same v5.2.8.1 · same A Tempfile object with the actual uploaded file. Note that some of its interface is available directly. On this page Support Bug Reports can be filed for the Ruby on Rails project on GitHub. Feature requests should be discussed on the rubyonrails-core forum. License Released under the MIT license.