Rails - Sep 2010 - Assertions on ActiveRecord errors array

In Rails 2 if I wanted to check if an ActiveRecord attribute had an
error on it I simply called

    assert user.errors.on(:name)

Now that this is depreciated what is a clean way to do this check?

This is ugly but it works..
    assert !user.errors[:name].empty?

remove the negative logic and it is still a bit verbose
    assert user.errors[:name].first

Stealing from the old on method we could use has_key?
   assert user.errors.has_key?(:name)

I suspect a lot of people accidentally change their validations to
   assert user.errors[:name]
but that always returns true

anyway,  what is the preferred way to do this check?   I feel like I''m
missing something obvious.  :-)

Tony

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