ruby - Automatically fetch preview image from given URL in Rails -

i need again community.

i'm interested know how extract preview image given url in rails.

basically, functionality have on reddit. when user submits link (fills in link field in _form), preview image/thumbnail automatically pulled given url. (i save link of image field in model, don't want save image itself).

is there gem or? what's best way it?

thanks help.

there gem github.com/gottfrois/link_thumbnailer wanted.

i tested it, , works described, can recommend it.