Setting up go blocks in mount/unmount is fine in my opinion, but yes, you must handle the concurrency issues that arise from doing this.
David On Mon, May 5, 2014 at 5:32 PM, Roman Scherer < [email protected]> wrote: > Hi, > > I think I'm running into a race condition while using om and > core.async. I have code like this: > > om/IWillMount > (will-mount [this] > (go (let [image (<! (load-image (om/get-state owner :url)))] > (om/set-state! owner :width (:width image)) > (om/set-state! owner :height (:height image))))) > > The load-image fn returns a channel. Then I do a blocking read on > that channel and at some point later, it returns a map which I > save to the component's local state. > > Mounting, unmounting and remounting works fine with one > component. However, when I have more than one instances of this > component and I remount them I get most of the time the following > error. > > Uncaught Error: Invariant Violation: forceUpdate(...): Can > only force an update on mounted or mounting components. > > This looks like the calls to om/set-state! within the go block > are sometimes called when the component is already unmounted. > > Now I'm wondering if I'm doing something wrong and have some > questions. > > * Is it bad style to use go blocks in the will-mount/did-mount fn > and set state in them? > > * Do other people have similar issues, and how to work around? > > * Any other idea what's going on? > > Thanks, Roman. > > -- > Note that posts from new members are moderated - please be patient with > your first post. > --- > You received this message because you are subscribed to the Google Groups > "ClojureScript" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/clojurescript. > -- Note that posts from new members are moderated - please be patient with your first post. --- You received this message because you are subscribed to the Google Groups "ClojureScript" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/clojurescript.
