How to resolve "Missing Credentials" with Paperclip and s3 store in rails 3

I have a fairly simple model and application

has_attached_file :upload,
    :storage => :s3,
       :bucket => 'bestofbauer',
       :s3_credentials => {
         :access_key_id => ENV['MyAccessKEY'],
         :secret_access_key => ENV['MySecretKey']


I have a bucket setup with s3 called bestofbauer.

I know I can refactor the credentials into the initializer, but I didn't get that to keep the attachment, but so I didn't bother with that.

When I run save the object and attach it, I get:

RuntimeError in RecommendationsController#create

Missing credentials


I poured out: Invalid credentials when uploading photos with Paperclip and Amazon s3 , but that didn't solve my problem.

I use the following gems:

gem "paperclip"
gem "sws-sdk"
gem 'aws-s3'


Any other ideas?


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1 answer

You need to set environment variables. Here are two different ways to do it:

  • Every time you run rails server

    or any other command that accesses your S3 account, you need to enable your keys:

    $ MyAccessKEY=ACCESS_KEY MySecretKEY=SECRET_KEY rails server

  • I am assuming you are using bash, so edit your ~/.bash_rc

    or ~/.bash_profile

    to set environment variables

    export MyAccessKEY=ACCESS_KEY
    export MySecretKEY=SECRET_KEY

    Then open a new terminal window and double check that they are installed

    $ echo $MyAccessKey

If you are deploying to Heroku, you will also need environment variables:

$ heroku config:add MyAccessKEY=ACCESS_KEY MySecretKEY=SECRET_KEY


You can view Heroku config:

$ heroku config


It will list all the configuration options you have for this application.

You probably want to put your S3 bucket name in the ENV setting so you don't mess up your bucket when testing locally.



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