Ok, thanks. Going back and re-reading the doc, it makes sense to me now.
On Tuesday, September 2, 2014 5:07:24 PM UTC-4, David Nolen wrote:
> The documentation explicitly states what types of values are supported
>
> out of box wrt converting into cursors - IMap & IIndexed only. List is
>
> not IIndexed. If you want List to work you need to implement IToCursor
>
> for this type.
>
>
>
> David
>
>
>
> On Tue, Sep 2, 2014 at 5:00 PM, Steve Ashton wrote:
>
> > Here's some sample code that demonstrates the difference. Things work if
> > the app-state atom is built from a vector. It fails if it is built from a
> > list.
>
> >
>
> >
>
> >
>
> > (ns om-tut.core
>
> > (:require [om.core :as om :include-macros true]
>
> > [om.dom :as dom :include-macros true]))
>
> >
>
> > (enable-console-print!)
>
> >
>
> >
>
> > ;; Swap the following two lines to see the difference. It works with the
> > vector,
>
> > ;; but throws an error with the list.
>
> > (def app-state (atom {:list (list {:num 1}{:num 2}{:num 3})}))
>
> > ;; (def app-state (atom {:list (vector {:num 1}{:num 2}{:num 3})}))
>
> >
>
> > (defn my-component [state owner]
>
> > (reify
>
> > om/IWillMount
>
> > (will-mount [_]
>
> > (println "I see the cursor type as: " (type state)))
>
> > om/IRender
>
> > (render [_]
>
> > (dom/div nil (:num state)
>
> > (dom/button #js {:onClick (fn [e] (println "You clicked "
> > @state))} "Print")))))
>
> >
>
> > (om/root
>
> > (fn [app owner]
>
> > (reify om/IRender
>
> > (render [_]
>
> > (dom/div nil
>
> > (apply dom/div nil
>
> > (om/build-all my-component (:list app)))))))
>
> > app-state
>
> > {:target (. js/document (getElementById "app"))})
>
> >
>
> >
>
> >
>
> > On Tuesday, September 2, 2014 1:29:43 PM UTC-4, Steve Ashton wrote:
>
> >> It appears to me that lists are not a supported collection to be used as a
> >> cursor. I see in the cursor doc it does specifically mention vectors and
> >> maps, but not lists:
>
> >>
>
> >> "During the render phase, you treat a cursor as a value, as a regular
> >> map or vector."
>
> >>
>
> >> I'm not sure if that means lists aren't supported, or that lists are
> >> converted to vectors internal to the cursor. If it is the former, what is
> >> the reason? If it is the latter, I have found some inconsistent behavior
> >> between vectors and lists in cursors.
>
> >>
>
> >> My use case for using a list is putting an edn formatted response into a
> >> cursor. If I use the data as I get it, it is a list.
>
> >
>
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