Adding default configuration options to Paperclip

July 23rd, 2011

Using paperclip, you’ll often put something like this in your models:

      has_attached_file :article_text,
        :storage => :s3,
        :s3_credentials => {
          :bucket => ENV['AS3_BUCKET'],
          :access_key_id => ENV['AS3_ACCESS_KEY_ID'],
          :secret_access_key => ENV['AS3_SECRET_ACCESS_KEY']
        }
       :s3_permissions => :private,
       :processors => [:manuscript_converter],
       :path => "manuscript/:id/:uploaded_manuscript_filename"

Many of these settings will be repeated in every paperclip’d model. You can easily remove that duplication by adding an initializer. In config/initializers/paperclip_defaults.rb:

      Paperclip::Attachment.default_options.merge!(
        :storage => :s3,
        :s3_credentials => {
          :bucket => ENV['AS3_BUCKET'],
          :access_key_id => ENV['AS3_ACCESS_KEY_ID'],
          :secret_access_key => ENV['AS3_SECRET_ACCESS_KEY']
        }
      )

And now you can remove those options from all your models – separating the parts that change from the parts that stay the same.

I had trouble finding this online and had to dig through the source code to figure it out. So maybe it will help someone else save a little time.

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