module Hashie::Extensions::SymbolizeKeys

to symbols.
Return a new hash with all keys converted

def symbolize_keys
  SymbolizeKeys.symbolize_keys(self)
end

test # => {:abc => 'def'}
test.symbolize_keys!
test = {'abc' => 'def'}
@example

Convert all keys in the hash to symbols.

def symbolize_keys!
  SymbolizeKeys.symbolize_keys!(self)
  self
end