api.array :projects, api_meta(:size => @elements.size) do
  @elements.each do |element|
    project = element[:project]

    api.project do
      api.id(project.id)
      api.name(project.name)
      api.identifier(project.identifier)

      api.has_children(!project.leaf?)

      api.level(element[:level])

      api.created_on(project.created_on.utc) if project.created_on
      api.updated_on(project.updated_on.utc) if project.updated_on
    end
  end
end