I haven't run into this yet as I've only been playing with re-frame for about a week, but you could write your own middleware to help you (middleware is easy to write). Maybe something like:
(dynamic-path [:path :to :* :value :*]) And it replaces the :* fields with data from the event. Eg: (dispatch [:foo [0 1] :other-data]) Which would then have the handler receive and update data at path [:path :to 0 :value 1] On Wed, 25 Mar 2015 18:40 Jamie Orchard-Hays <[email protected]> wrote: > Thanks, Taylor. I'd seen path. It doesn't do what I need, but after > reviewing and thinking about it, it may be a good part of a solution. > Mainly what is the hard part is dealing with a tree of nested maps/vectors. > You won't necessarily know the path until run-time, and certainly don't > want to rely on the index location in a vec in case there have been data > transformations along the way to the view code. So, when updating a value > in the view and sending that value back to app-db, I need to be able to > reliable find the correct item in the tree and update it. > > I've been playing with my own naive code, clojure.walk and zippers. I find > zippers conceptually understandable, but practically daunting. However, I > came across this link, which does what I'm looking for: > > https://gist.github.com/renegr/9493967 > > I'm curious how other users of Reagent and Re-Frame (and Quiescent) and > handling the updating of app-db trees more complex than a simple one-level > map. > > Cheers, > > Jamie > > On Mar 25, 2015, at 2:17 PM, Taylor Sando <[email protected]> wrote: > > > There was handler middleware for helping with deeply nested structure > > > > middleware/path > > A middleware factory which supplies a sub-tree of `db` to the handler. > > Works a bit like update-in. Supplies a narrowed data structure for the > handler. > > Afterwards, grafts the result of the handler back into db. > > Usage > > > > https://github.com/Day8/re-frame/blob/master/src/re_ > frame/middleware.cljs > > > > So if your data is at :path :to :value, you could have a middleware > handle definition like: > > > > (register-handler :some/key (path [:path :to :value]) hander-fn) > > > > Then handler-fn would be passed the value, and all you need to return is > the updated value from the handler-fn, it will be placed into the app at > the path location. > > > > -- > > 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. > -- 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.
