Ruby on Rails

i always worry if myown active_record callback conflicts with rails'
implemented corresponding one.i assume rails itself perhaps also use
active_record callback.for example:

#myown callback
class Book < ActiveRecord::Base
def after_save
...

end
end

when i define the after_save for Book,i think perhaps this after_save
has overrided rails itself's implemented one,if so,i want to use both of
them.

is my consideration right?
does rails use active_record callbacks? if it is true,how do i take care
of myown's and rails'.

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