You can find sample projects that demonstrate common Cloudinary use cases in Ruby on Rails here:
Included are three sample projects:
"Basic": a sample for Ruby:
This sample project uploads local and remote images to Cloudinary and generates URLs for applying various image transformations on the uploaded files.
"Basic-Rails": a basic sample for Rails:
Similar to the basic sample described above, but implemented as a Rails project. In addition to image uploads, this sample application demonstrates the usage of Cloudinary's view helpers (e.g.
cl_image_tag) to apply various image transformations inside Rails views.
The Photo Album is a full working project for uploading images to a persistent photo album and browsing photos and thumbnails. It uses CarrierWave for managing attachments in the model and perform uploading either from the server side or directly from the browser