PaperClip + S3 with a custom path

paperclip.rb

#config/initializers/paperclip.rb

Paperclip::Attachment.default_options[:s3_host_name] = 's3-us-west-2.amazonaws.com'
Paperclip::Attachment.default_options[:url] = ':s3_domain_url'
Paperclip::Attachment.default_options[:path] = '/:class/:attachment/:id_partition/:style/:filename.#{Time.now.to_i}'

production.rb

#config/environments/production.rb

config.paperclip_defaults = {
  :storage => :s3,
  :s3_credentials => {
    :bucket => ENV['S3_BUCKET_NAME'],
    :access_key_id => ENV['AWS_ACCESS_KEY_ID'],
    :secret_access_key => ENV['AWS_SECRET_ACCESS_KEY']
  }
}

some_model.rb

class SomeModel < ActiveRecord::Base 
  
  has_attached_file :avatar, styles: {
    thumb: '100x100>',
    square: '200x200#',
    medium: '300x300>'
  }
 
  validates_attachment_content_type :avatar, :content_type => /\Aimage\/.*\Z/
end