ruby - Rails model set boolean when record updated -


i have model want set boolean false whenever changed. taht way can reprocess later make sure related records date. i've tried few things, keep getting myself loop.

/app/model/contest.rb

class contest < activerecord::base   has_many :results, dependent: :destroy    after_update :set_contest_not_updated    def set_contest_not_updated     self.contest_updated=false     self.save   end    def set_contest_updated     self.update_column(:contest_updated_at, time.now)     self.update_column(:contesy_updated, true)   end

expected action:

  contest.update_atrributes(flag_that_effects_scoring: true)

i expect above run, contest.contest_updated boolean set false , set true when contest.set_contest_updated() method run.

of course calling save in after_update callback loop. keeps saving on , on again until end of time.

however, before_update should job done.
ps: don't call save on *_save , *_update callbacks. loops.

  before_update :set_contest_not_updated    def set_contest_not_updated     self.contest_updated = false   end

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