Here is an example that works and uses a let. I wonder if the reaction inside
the let is making it work...
(defn- render-one [state-key render-key db]
(let [id (-> [:add-patient/tree-state state-key]
subscribe
deref
:selected-ids
first
reaction)]
(reaction @(subscribe [render-key @id]))))
On Friday, 3 April 2015 20:53:57 UTC+1, Colin Yates wrote:
> My insanity must be worse than I thought because I could swear it was
> working earlier!
>
> On 3 April 2015 at 20:45, AndyR <[email protected]> wrote:
> > reaction is a macro that expands to evaluating the passed forms (here: 'v')
> > within a function (make-reaction).
> > I don't know the internals of Reagent but my guess is that Reagent has to
> > figure out which ratoms were used in that function call. This is done
> > somehow (by maybe some context setting etc) but it's not too important to
> > know.
> >
> > What matters is: In your case the v is evaluated before (by the "let") so
> > nothing is noticed by (reaction).
> >
> > On Friday, April 3, 2015 at 3:21:02 PM UTC-4, Colin Yates wrote:
> >> I know I am going insane:
> >>
> >> (register-sub
> >> :add-patient/selected-journey-details-field
> >> (fn [db]
> >> (reaction (-> [:add-patient/local]
> >> subscribe
> >> deref :selected-journey-details-field))
> >>
> >> #_(let [v (-> [:add-patient/local]
> >> subscribe
> >> deref :selected-journey-details-field)]
> >> (reaction v))))
> >>
> >> works but
> >>
> >> (register-sub
> >> :add-patient/selected-journey-details-field
> >> (fn [db]
> >> #_(reaction (-> [:add-patient/local]
> >> subscribe
> >> deref :selected-journey-details-field))
> >>
> >> (let [v (-> [:add-patient/local]
> >> subscribe
> >> deref :selected-journey-details-field)]
> >> (reaction v))))
> >>
> >> doesn't. And by 'not working' I mean the component doesn't notice any
> >> changes to a subscription to :add-patient/selected-journey-details-field.
> >>
> >> After 4 hours banging my head I reduced it to the above, literally
> >> commenting one and uncommenting the other (with a browser refresh
> >> in-between).
> >>
> >> Any suggestions?
> >
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