Redmine/app/views/trackers/index.api.rsb

api.array :trackers do
  @trackers.each do |tracker|
    api.tracker do
      api.id tracker.id
      api.name tracker.name
      api.default_status(:id => tracker.default_status.id, :name => tracker.default_status.name) unless tracker.default_status.nil?
    end
  end
end