Ruby on Rails

Hello all,

I followed the Heroku article on creating a Direct to S3 file uploader for my Rails app. https://devcenter.heroku.com/articles/direct-to-s3-image-uploads-in-rails

I think that I did everything the tutorial said...

In my users_controller, under new is:

This code seems fine, and is pretty much exactly as the article says.

The problem is in my image_loader.js.erb, the following:

fileInput.fileupload({
      fileInput:       fileInput,
      url:             '<%= @s3_direct_post.url %>',
      type:            'POST',
      autoUpload:       true,
      formData:         <%= @s3_direct_post.fields.to_json.html_safe %>,

Turns out:

undefined method `url' for nil:NilClass

in fact this breaks an otherwise working app. 

The code in my controller should create the @s3_direct_post object, but it seems that my javascript doesn't pick it up, maybe?

I've tried putting the code in the view with <script> tags, as well, with the same results.  Any help out there?

Thanks!