Creating a DropZone for image uploads. Also sending a JavaScript global variable via the DropZone Headers to the controller. More Header info here: http://api.rubyonrails.org/classes/ActionDispatch/Request.html#method-i-headers

aws.yml

development:
  access_key_id: "AKIAIRJ4D........"
  secret_access_key: "qO/Xh8mOJ......."
  simple_db_consistent_reads: false

production:
  access_key_id: "AKIAIR.........."
  secret_access_key: "qO/Xh8..........."
  simple_db_consistent_reads: true

AWS_CORS_policy.txt

****** NOTHING TO CHANGE HERE, JUST COPY AND PASTE INTO AWS ***********

<?xml version="1.0" encoding="UTF-8"?>
<CORSConfiguration xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
    <CORSRule>
        <AllowedOrigin>*</AllowedOrigin>
        <AllowedMethod>GET</AllowedMethod>
        <AllowedMethod>PUT</AllowedMethod>
        <AllowedMethod>POST</AllowedMethod>
        <MaxAgeSeconds>3000</MaxAgeSeconds>
        <AllowedHeader>*</AllowedHeader>
    </CORSRule>
</CORSConfiguration>

Bucket_policy

******* MAKE SURE TO USE YOUR OWN BUCKET NAME, NOT 'swaggr'! *********
{
	"Version": "2008-10-17",
	"Statement": [
		{
			"Sid": "AllowPublicRead",
			"Effect": "Allow",
			"Principal": {
				"AWS": "*"
			},
			"Action": "s3:GetObject",
			"Resource": "arn:aws:s3:::swaggr/*"
		}
	]
}

uploads.js

// Call the function on Edit btn click; may not need 'headers'
// Make sure 'url' below is correct
function DropZone(){
    alert(_selectedCatID);
        $("#primaryImage").dropzone({
            url: '/uploads/process',
            maxFilesize: 1,
            // paramName: "upload[image]",
            headers: {'catID': _selectedCatID}, // sending the category id to the controller
            addRemoveLinks: false,
            success: function(file, data){
                $('#primaryImage .dz-success-mark').css('opacity', '1');
                $('#primaryImage .dz-progress').css('opacity', '0');
                
            }
        });
    } //

uploads_controller.rb

# ****** CHANGE BUCKET NAME FROM 'foreverbridal' *********************
# SEE: http://docs.aws.amazon.com/AWSSdkDocsRuby/latest/DeveloperGuide/ruby-dg-samples.html
# **** YOU CANNOT HAVE A 'PROCESS' METHOD IN MAIN CONTROLLER!!! RENAME TO 'UPLOAD'
# FOR NO CONFLICTS!  OTHERWISE YOU WILL GET ERRORS OR A WHITE/BLANK VIEW ********
# ALSO: you may not need '(stuff)'. If you get a 0 for 1 argument error, remove it.
def process(stuff)
    # p stuff
    file = params['file']

    s3 = AWS::S3.new

    # Upload a file.
    key = File.basename(file.tempfile)
    uploaded = s3.buckets['foreverbridal'].objects[key].write(:file => file.tempfile)
    
    catID = request.headers['HTTP_CATID'] #Getting CatID via Header from DropZone call
    image = uploaded.key # THIS IS THE IMAGE STRING/LOCATION/URL TO BE STORED IN DB

    render json: { blah: image } # THIS IS WORKING! SENDS JSON TO SUCCESS CALL IN DROPZONE IN UPLOADS.JS
end