Rails heroku invalid configuration option - ruby-on-rails

Question

When I deploy to heroku and run heroku run rake db:migrate I get the error:
ArgumentError: invalid configuration option `:aws_access_key_id'
config/initializers/aws.rb
if Rails.env.production?
S3Client = Aws::S3::Client.new(
aws_access_key_id: ENV['AWS_ACCESS_KEY_ID'],
aws_secret_access_key: ENV['AWS_SECRET_ACCESS_KEY'],
aws_region: 'us-east-1'
)
end
config/initializers/carrierwave.rb
if Rails.env.production?
CarrierWave.configure do |config|
config.fog_credentials = {
provider: 'AWS',
aws_access_key_id: ENV['AWS_ACCESS_KEY_ID'],
aws_secret_access_key: ENV['AWS_SECRET_ACCESS_KEY'],
region: 'us-east-1'
}
config.fog_directory = ENV['S3_BUCKET']
end
end
Why am I getting the `invalid configuration option' error?
EDIT
New config/initializers/carrierwave.rb file:
if Rails.env.production?
CarrierWave.configure do |config|
config.fog_credentials = {
provider: 'AWS',
access_key_id: ENV['AWS_ACCESS_KEY_ID'],
secret_access_key: ENV['AWS_SECRET_ACCESS_KEY'],
region: 'us-east-1',
aws_access_key_id: ENV['AWS_ACCESS_KEY_ID'],
aws_secret_access_key: ENV['AWS_SECRET_ACCESS_KEY'],
aws_region: 'us-east-1'
}
config.fog_directory = ENV['S3_BUCKET']
#config.fog_attributes = {:signature_version => :v4}
end
end
config/initializers/aws.rb is now empty.
This has fixed the invalid configuration option problem. However it has been replaced with the error Missing required arguments: aws_access_key_id, aws_secret_access_key when I run RAILS_ENV=production bundle exec rake assets:precompile.
Even more confusingly, I managed to successfully run RAILS_ENV=production bundle exec rake assets:precompile once after the above changes, but it suddenly stopped working.

Answer 1

The options when creating an Aws::S3::Client are not prefaced with aws_. That would just be silly.
if Rails.env.production?
S3Client = Aws::S3::Client.new(
access_key_id: ENV['AWS_ACCESS_KEY_ID'],
secret_access_key: ENV['AWS_SECRET_ACCESS_KEY'],
region: 'us-east-1'
)
end
However you don't actually need to pass the credential options:
Default credentials are loaded automatically from the following
locations:
ENV['AWS_ACCESS_KEY_ID'] and ENV['AWS_SECRET_ACCESS_KEY']
http://docs.aws.amazon.com/sdkforruby/api/Aws/S3/Client.html

Answer 2

I followed the steps from this page http://lifesforlearning.com/uploading-images-with-carrierwave-to-s3-on-rails/
Instead of PictureUploaded I used ImageUploader in app/uploads/picture_uploader.rb and instead of carrier_wave.rb or carrierwave.rb I set the environment variables in s3.rb. It worked for me after doing these changes.