Fixes 'not Ok for value' mongo DB error, when key contains '.' (DOT) character

mongodb_keys.rb

def mongodb_keys(from,to,data)
  if data.kind_of? Hash
    result = {}
    data.each_pair do |k,v|
      result[k.to_s.gsub(from, to)] = mongodb_keys(from, to, v)
    end
    return result
  elsif data.kind_of? Array
    result = []
    data.each do |v|
      result.push mongodb_keys(from, to, v)
    end
    return result
  else
    return data
  end
end

s = 'JSON code here...'
d = mongodb_keys('.', '_DOT_', JSON.parse(s)); nil
c = mongodb_keys('_DOT_', '.', d); nil