Puzzled by ActiveRecord

Dear list,

At the moment I am working on an app which has a good few models and
associations. In short:
A :has_many B
B :belongs_to A

Now I want to update A when I have saved B, so I wrote a after_save
filter. However the update of A entails looking at all associated B’s
so I wrote something like:
self.Bs.each do |b|
#do something
end

This did not work. It iterated alright but almost all attributes in B
were empty. Writing:
self.Bs.find(:all).each do |b|
#do something
end

This did work! Why?

With kind regards,
Harm

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