Convert hash conditions to array conditions (required by find_by_tsearch) (See related posts)

class Hash
  def to_array_conditions
    [self.keys.map{|k| "#{k} = ?" }.join(" AND "), self.values].flatten
  end
end

test "convert hash conditions to array conditions" do
  assert_equal ['city = ? AND country_code = ? AND state = ?',
    "Adendorf", "DE", "Niedersachsen"], {
      :country_code => "DE",
      :state => "Niedersachsen",
      :city => "Adendorf"
    }.to_array_conditions
end