[Rails] HABTM and getting to arrays from either direction

[DWFrank]

I didn't find exactly an answer on this one, so I'd like to get a 
clarification from folks who live & breathe HABTM.

class foo
  has_and_belongs_to_many :bars
end

class bar
  has_and_belongs_to_many :foos
end

(and yes, I have a bars_foos table in my db)

def test_habtm
  bar = Bar.new
  foo = Foo.new

  foo.bars<<bar
  assert !foo.bars.empty?
  assert !bar.foos.empty?
end

My first assert passes just fine.  But the 2nd fails.  Am I wrong on the 
concepts of HABTM? Shouldn't the << operator add to the join table and 
therefore the next find from either object return a non-empty array?

thx,
--dwf



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