ruby on rails - ActiveRecord: update_all shows query in debug log, but doesn't execute in DB? -

i've got following update query running in function called before_destroy callback in rails model:

annotation.joins(:annotation_groups)   .where({'annotation_groups.group_id' => self.id})   .update_all({qc_approved: false}) if doc.in_qc?` 

(i've tried following simpler version see if angle works: self.annotations.update_all({qc_approved: false}))

both generate below sql query in "server development log" (debugging in rubymine):

update "annotations" set "qc_approved" = 'f' "annotations"."id" in (select "annotations"."id" "annotations" inner join "annotation_groups" on "annotation_groups"."annotation_id" = "annotations"."id" "annotation_groups"."group_id" = 159)

however, far can tell, sql never causes db update, though destroy process afterwards works fine. can set breakpoint directly after statement , @ database, , qc_approved fields still true. however, can copy , paste statement postgres console , run it, , updates fields correctly.

is aware cause behavior? before_destroy exist in own strange alternate transactional universe causes odd behavior this? scenario cause sql show in server log not make db?

thanks quick , helpful comments above confirming nature of callback inside larger transaction, figured out.. despite name, before_destroy executing after dependent destroy calls, joined annotation_group table row destroyed before update statement relied on called in transaction.

to more specific, added :prepend => true before_destroy definition ran before destroys intended.