Rails - Aug 2006 - restricting has_many associations to one relation

Hi All,

I''m just getting familiar with has_many :through usage, and something 
became apparent quickly: there was nothing preventing the same relation 
from being inserted into my join table multiple times.

group_id      user_id
-------       ------
1                  1
1                  1

etc. would happen upon many refreshings of the post.

I can think of several ways to prevent this from happening, but what is 
the best Rails way of doing it? (a unique index on the table feels like 
cheating...)

Any thoughts or pointers?

Thanks!

Jack

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