yaml_config_variables.rb

# load from YAML for defaults
s3_config = YAML.load_file("#{Rails.root}/config/s3.yml")[Rails.env] || {}
 
# ENV variables take precedent
s3_config['aws_access_key_id'] = ENV['AWS_KEY'] if ENV['AWS_KEY']
s3_config['aws_secret_access_key'] = ENV['AWS_SECRET'] if ENV['AWS_SECRET']
s3_config['provider'] ||= 'AWS'
 
s3_config.symbolize_keys!
 
CarrierWave.configure do |config|
  config.fog_credentials = s3_config.slice(
    :aws_access_key_id,
    :aws_secret_access_key,
    :provider
  )
end