Question

I have gone through the railscast and researched here on Stack Overflow. Although I have found others with the same issue, it doesn’t appear that any of the other solutions I have researched seem to work. I have tried multiple variations of the code as suggested in other posts… No luck.

I am attempting to upload and store PDF files to Amazon S3 via the Carrierwave and Fog gems to no avail. While I am using Heroku in production, I have not attempted to deploy this to Heroku yet since I cannot even get this to work locally. The error returned is

Missing required arguments: aws_access_key_id, aws_secret_access_key

How can I fix this problem?

carrierwave.rb (initializer)

CarrierWave.configure do |config|
    config.fog_credentials = {
        provider: 'AWS',
        aws_access_key_id: ENV['MY_KEY_ID'],
        aws_secret_access_key: ENV['MY_KEY']
    }

    config.fog_directory  = ENV['MY_BUCKET']
    config.fog_public     = false
end

pdf_uploader.rb:

class PdfUploader < CarrierWave::Uploader::Base
    storage :fog

    include CarrierWave::MimeTypes
    process :set_content_type

    def store_dir
        "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
    end
end

Answer 1

It looks like there was an issue with setting the key_id, key AND bucket as environmental variables. Once I changed all three to string constants, it seemed to work fine. I also deployed to Heroku and verified functionality in production as well.

the final initializer file:

CarrierWave.configure do |config|
    config.storage = :fog
    config.fog_credentials = {
        provider: 'AWS',
        aws_access_key_id: 'MY_KEY_ID_HERE',
        aws_secret_access_key: 'MY_KEY_HERE'
    }

    config.fog_directory  = 'MY_S3_BUCKET_HERE'
    config.fog_public     = false
end