gistfile1.rb

module ProteinPresenter 
  custom_presenter = lambda { |att| att.to_s }
  # тут делаются презентеры, хотя лучше из выносить вообще в 
  # отдельные файлы. Существующих возможностей для этого куча.
  presenter :title, lambda {|att| attr.capitalize } 
  presenter :num, custom_presenter
  presenter :m2, lambda {|m| m.to_s.capitalize }
end

output :json
alias :protein_hits, :proteins
context :root, :storage => :hash # {}
context :proteins, :storage => :array, :anchor => :data  # { :data => [] }
context.each do |protein|
  protein.extend(ProteinPresenter)
  context :protein, :storage => :hash # { :data => [{}]
  attributes :all, :except => [:created_at, :updated_at]
  methods :m1, :m2, [:m3, param1, param2]
  context :taggings, :storage => :array # {:data => [{..., :taggings => []}]
  context.each do |tag|
    context :tag, :storage => :hash
    attributes :only => [:title, :creator_id]    
  end
end