json.hackathon do
  json.(@hackathon, :id, :name, :description)
  json.hackathon_users_count @hackathon_users_count
end
json.hacks_count @hacks_count
json.hacks @hacks do |hack|
  json.(hack, :id, :name, :description, :hack_users_count)
  json.entry_info hack.entry_info(current_user.id)
end