SCREEN_NAME_RANGE = SCREEN_NAME_MIN_LENGTH..SCREEN_NAME_MAX_LENGTH
.
.
.
validates_length_of :screen_name, :within => SCREEN_NAME_RANGE , :too_short => "jest zbyt krtki (minimum to #{SCREEN_NAME_MIN_LENGTH} znaki).", :too_long => "jest zbyt dugi (maksimum to #{SCREEN_NAME_MIN_LENGTH} znaki)."

