working with 4sq

categories.rb

require 'json'
require 'net/http'
require 'csv'

uri = URI('https://api.foursquare.com/v2/venues/categories?oauth_token=QRY3YNHKTYK24JSQPFVBII2YI233T5OZHO2ZQMCG3YU2U05P&v=20140708&locale=ru')
PUSH = -> (categories, scope) do
  categories.inject([]) do |res, category|
    row = scope + [category['id'], category['name']]
    res + [row, *PUSH[category['categories'] || [], row]]
  end
end

PUSH[JSON.parse(Net::HTTP.get(uri))['response']['categories'], []]