thanks @mikethompson

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Hey

I'm looking for a way to dispatch events when certain parts of the state changes

Like: I want to :fetch-search when :filters change

Would this be a bad idea?

I'm writing too much dispatches that dispatch to :fetch-search

@hugobessaa: :fetch-search doesn't sound like an event. It sounds like that should be a normal function that's called in event handlers that change :filters.

I understand your concern about preventing repitition and wanting to hook into "when :filters change. I believe that according to the idea and intention of re-frame there is no such hook and you should organize your events in a way that it doesn't feel like duplication when you call fetch-search in a lot of places: You're already setting :filters in a number of places (afaiu), instead in all these places you could have a function (fn set-filters [db new-filters] (do (fetch-search new-filters) (assoc db :filters new-filters))) or similar.

@mbertheau: thanks for your feedback! It really does look like a function

@hugobessaa: yep, I agree with @mbertheau. Having said that, the on-change middleware might be useful, maybe https://github.com/Day8/re-frame/blob/master/src/re_frame/middleware.cljs#L197-L235