[Rails] attrs_accessible.

I know it's a good practice setting attr_accesible for models.
As an example if I have a model with admin: boolean attribute and if I
don't set attr_accessible, a user can do: put /users/17?admin=1 making
user 17 an admin.
But if I have attr_accessible set and I want to create new users with
a html form, how can I set admin true or false?
I have to do an update directly in the database?

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