Paperclip Refresh Tasks for Capistrano 3

capistrano.paperclip.rake

# Put this in your rails_app/lib/capistrano/tasks/paperclip.rake

namespace :paperclip do
    namespace :refresh do

        desc "Refresh All Paperclip Styles (Must Specify 'CLASS' parameter)"
        task :all do
            if ENV['CLASS']
                on roles(:app) do
                    within release_path do
                        with rails_env: fetch(:rails_env) do
                            execute :rake, "paperclip:refresh CLASS=#{ENV['CLASS']}"
                        end
                    end
                end
            else
                puts "\n\nFailed! You need to specify the 'CLASS' parameter!",
                     "Usage: cap <stage> paperclip:refresh:all CLASS=YourClass"
            end
        end

        desc "Refresh Missing Paperclip Styles"
        task :missing do
            on roles(:app) do
                within release_path do
                    with rails_env: fetch(:rails_env) do
                        execute :rake, "paperclip:refresh:missing_styles"
                    end
                end
            end
        end

    end
end