Avatar concern.

avatar.rb

# rails g paperclip {{model_name}} avatar && rake db:migrate
module Avatar
  extend ActiveSupport::Concern

  included do
    avatar_options = WMR::Constants::AVATAR_OPTIONS

    if Rails.env.production?
      avatar_options.merge!(WMR::Constants::S3_CREDENTIALS)
    end

    has_attached_file :avatar, avatar_options

    validates_attachment :avatar, content_type: { content_type: /\Aimage\/.*\Z/ },
                                  size: { in: 0..10.megabytes }
  end
end