class Hash

def contains(contains)

deep check if all values are contained 
def contains(contains)
  hash = smash
  contains = contains.smash
  contains.each do |key, val|
    return false if hash[key] != val
  end
  true
end

def deep_merge(second)

Inspired by: http://stackoverflow.com/a/9381776 
def deep_merge(second)
  merger = proc { |_key, v1, v2|
    v1.is_a?(Hash) && v2.is_a?(Hash) ? v1.merge(v2, &merger) : v2
  }
  merge(second, &merger)
end

def smash(prefix = nil)

hash.smash # => {"a"=>1, "b-c"=>2}
}
'b' => {'c' => 2},
'a' => 1,
hash = {
converts a deep hash into a flat hash 
def smash(prefix = nil)
  inject({}) do |acc, (key, value)|
    index = prefix.to_s + key.to_s
    if value.is_a?(Hash)
      acc.merge(value.smash(index + '-'))
    else
      acc.merge(index => value)
    end
  end
end