I've created a lightswitch field that defaults to "On", and it works fine for new entries, but for all existing entries it is set to "Off". I'm keen to avoid having to manually go through all existing entries switching it to "On" - is there a way of making existing entries respect the default value of this new field (rather than treating the absence of a value for it from when they were created as "Off")?
(Or alternatively: is there an easy way to set a field to "On" for all existing entries?)