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There're a lot of places in Rails source code which make a lot of sense to switching to Object#in? or Object#either? instead of using [].include?.
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The old method of redefining destroy meant that clearing the HABTM join table would happen as long as the call to destroy succeeded. Which meant if there was a before_destroy that stopped the instance being destroyed using normal means (returning false, raising ActiveRecord::Rollback) rather than exceptional means the join table would be cleared even though the instance wasn't destroyed. Doing it in an after_destroy hook avoids this and has the advantage of happening inside the DB transaction too.
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callbacks etc) rather than calling a whole bunch of methods with rather long names.
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