class Hash

def deep_symbolize_keys

# => {:person=>{:name=>"Rob", :age=>"28"}}
hash.deep_symbolize_keys

hash = { 'person' => { 'name' => 'Rob', 'age' => '28' } }

and from all nested hashes and arrays.
they respond to +to_sym+. This includes the keys from the root hash
Returns a new hash with all keys converted to symbols, as long as 
def deep_symbolize_keys
  deep_transform_keys { |key| key.to_sym rescue key }
end