set a default group to registered users with sfDoctrineGuard

i thought that this was going to be an easy move as what i'm trying to do sounds like, but i'm kind of new to symfony, but all i want is users who register in my web belongs to a group that is the one i use to identify frontend users, 开发者_StackOverflow中文版but the more i look less i found, thought that something like setGroup('user') was enough, but think i'm lost

some help please

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Check this thread , maybe it will be helpful to you.