Module: Geocoder::Util

Defined in:
lib/geocoder/util.rb

Class Method Summary collapse

Class Method Details

.recursive_hash_merge(h1, h2) ⇒ Object

Recursive version of Hash#merge!

Adds the contents of h2 to h1, merging entries in h1 with duplicate keys with those from h2.

Compared with Hash#merge!, this method supports nested hashes. When both h1 and h2 contains an entry with the same key, it merges and returns the values from both hashes.

h1 = {"a" => 100, "b" => 200, "c" => {"c1" => 12, "c2" => 14}}
h2 = {"b" => 254, "c" => {"c1" => 16, "c3" => 94}}
recursive_hash_merge(h1, h2)   #=> {"a" => 100, "b" => 254, "c" => {"c1" => 16, "c2" => 14, "c3" => 94}}

Simply using Hash#merge! would return

h1.merge!(h2)    #=> {"a" => 100, "b" = >254, "c" => {"c1" => 16, "c3" => 94}}

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# File 'lib/geocoder/util.rb', line 23

def self.recursive_hash_merge(h1, h2)
  h1.merge!(h2) do |_key, oldval, newval|
    oldval.class == h1.class ? self.recursive_hash_merge(oldval, newval) : newval
  end
end