Raising an exception in ruby when a hash does not contain all required ( expected ) keys

gistfile1.txt

#
# approach 1
#
expected_keys       = { :a, :b, :c }
sample_hash         = { a: 1, b: 2 }
begin
  expected_keys.each { |k| raise StandardError, "#{k} not found" unless sample_hash.has_key? k }
rescue StandardError => e
  puts e
end

#
# Approach 2
# 
def hash_has_all_keys(hash_to_check, expected_keys)
  expected_keys.all? { |k| hash_to_check.fetch(k) }
rescue KeyError => e
  puts e
end

Thanks to @johnsyweb for the assist with this