hash to json

hash_json.rb

hash = {
  :persons => []
}

persons.each do |person|
  person_hash = {
    :name => person.name,
    :email => person.email,
    :phone => []
  }
  person.phone_numbers.each do |number|
    person_hash[:phone] << number
  end
  hash[:persons] << person_hash 
end

hash.to_json