Module: Ensconce::Mangle

Defined in:
lib/ensconce/mangle.rb

Class Method Summary collapse

Class Method Details

.deep_merge(original, replacement) ⇒ Object

Hash#merge will replace the value of a key with its replacement’s value. If the value is itself a hash, the original is replaced. With deep_merge, if the value is a hash the original value is merged with the replacements.

original    = {one: {two: 2}, three: 3}
replacement = {one: {four: 4}}
original.merge(replacement)              --> {one: {four: 4}, three: 3}
Mangle.deep_merge(original, replacement) --> {one: {two: 2, four: 4}, three: 3}



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# File 'lib/ensconce/mangle.rb', line 13

def self.deep_merge(original, replacement)
  if original.kind_of? Hash
    original.merge(replacement){|key, oldval, newval| deep_merge(oldval, newval)}
  else
    replacement
  end
end

.rekey(hash, change_map) ⇒ Object

Changes the keys of a hash based on a hash. The map is a hash where the values are the old keys, and the values are the replacement keys

original = {one: {two: 2}, three: 3}
hash      = {one: :four, three: :five}
Mangle.rekey(original, hash)  -->   {four: {two: 2}, five: 3}



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# File 'lib/ensconce/mangle.rb', line 26

def self.rekey(hash, change_map)
  change_map.each{|old, new| hash[new] = hash.delete(old)}
  return hash
end