Rails - Aug 2012 - invoking an activerecord relation method on the result of a calculation method, which returns a FixNum type

I was seeing these examples in a book:

Person.minimum(:age).where(''last_name <> ?'',
''Drake'')
Person.minimum(:age).having(''min(age) >
17'').group(:last_name)

The thing is minimum is returning a FixNum. When invoking the relation
methods (e.g. where, having) on a fixnum will raise an exception:

undefined method `where'' for 1:Fixnum

So am I missing something here?

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