Rails 4: How to upload a javascript Blob? - javascript

I'm building a Rails app that uses client-side javascript to edit an image and produce a Blob containing the data for the newly created image. I'm using the Paperclip gem to manage storing images on the server-side. I know how to upload images using Rails and Paperclip via traditional forms. But how do I upload this Blob? I would prefer an AJAX solution.

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I am building a Phonegap Application and for client side MVC I am using Backbone. My App is using camera for clicking images then it uploads that images to the server.
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