render js templates in rails

gistfile1.rb

# in controller:
# @item = JsTemplate.new('item', :renderer => :mustache)
# in view:
# %span=@item.user.name
# rendered:
# {{item.user.name}}

class JsTemplate
  def initialize(id, options = {})
    parents = options[:parents] || {}
    @renderer = options[:renderer]
    @path = parents + [id]
  end

  def method_missing(sym, *args, &block)
    self.class.new(sym.to_s, @path)
  end

  def to_s
    json_path = @path.join('.')
    renderer == :mustache ? "{{#{json_path}}}" : "<%=#{json_path}%>"
  end
end