Rails - May 2006 - foreign key problem - ''key not found'' error

Hello,

I have the following structure:

model foo
  has_many :bars:,
                  :dependent => true
end

model bar
  belongs_to :foo
end

-----------------
I''m doing the following to insert the Foo record and it''s
dependent Bar
record:

f = Foo.create(...)

This successfully creates and stores f away in the table.

Now,

b = Bar.new(params[...])
f.bars << b  <-- This should set the foreign key in b automatically.

But I get a ''key not found'' problem.  I get the same problem
if I do:

f.bars.create(params[...])

Any help on this would be appreciated.  I''ve been on this bug for 2
days
now.  Thanks.
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