Any plugins to add index in varchar field?

Rails
1

is it useful to add index for string field (column)
is there any plugins for that ?

2

On 22 Feb 2008, at 15:13, Pokkai D. wrote:

is it useful to add index for string field (column)
is there any plugins for that ?
yes it is useful. You don’t need a plugin, the add_index function in
rails already does that.

Fred