unaccent.rb

map = [
  "âãäåāăąÁÂÃÄÅĀĂĄèééêëēĕėęěĒĔĖĘĚìíîïìĩīĭÌÍÎÏÌĨĪĬóôõöōŏőÒÓÔÕÖŌŎŐùúûüũūŭůÙÚÛÜŨŪŬŮñÑçÇüÜ".mb_chars,
  "aaaaaaaaaaaaaaaeeeeeeeeeeeeeeeiiiiiiiiiiiiiiiiooooooooooooooouuuuuuuuuuuuuuuunnccuu"
]

# ActiveSupport::Multibyte::Chars#tr broken?
word = "anything"
adapted_word = "%#{word.mb_chars.split(//).map {|e| (p = map[0].index(e)) ? map[1][p,1] : e.to_s  }.join.downcase}%"
Post.where("lower(translate(title, '#{map[0]}', '#{map[1]}')) like #{Post.connection.quote word}")