Question

I have been struggling with a problem for the past days in a Ruby on Rails App I’m currently working on. I have different countries and for each country we use different Amazon S3 buckets. Amazon S3 key credentials are stored as constants in config/environments/environment_name.rb(ex:demo.rb) There is no way for me to determine which country we are operating from the config file. I can determine which country we are operating from the controllers,models,views,etc but not from the config file. Is there a Ruby meta programming or some other kind of magic that I’m not aware of so that I want to say if we are working on UK as a country in the app, use UK’s bucket credentials or Germany as a country, use Germany’s bucket credentials? I can’t think of a way to pass parameters to environment files from the app itself. Thank you very much in advance for all your helps.

Answer 1

Rather than actually pass the configuration details to whichever S3 client you’re using at launch, you should probably select the relevant credentials for each request. Your config file can define them all in a hash like so:

# config/s3.rb
S3_BUCKETS => { 
  :us => 'our-files-us',
  :gb => 'our-files-gb',
  :tz => 'special-case'
}

Then you can select the credentials on request like so (in maybe your AppController):

bucket_name = S3_BUCKETS[I18n.locale]
# pass this info to your S3 client

Make sense?