[Rails] Adding confirmed to a nearly complete rails application

I am coming to the end of my rails project now and I have done
everything I wish to do apart from confirm the users account through
email before creating it. I already have it to send an email to the user
but I want the user to contain a link. It's far too late to add devise
now as I already have a users table etc.

I have heard of having a confirmed field in the users table and having
it set to false and then true on user confirmation, but I have no idea
on how to implement this. Any ideas?

If anyone else has some other solutions or links to tutorials showing
how to add such feature then that would be outstanding. The end is so
close yet so far.

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