yes, I’ve seen this, but what about support of that in om.next?
> 30 марта 2016 г., в 02:01, Linus Ericsson <oscarlinuserics...@gmail.com>
> написал(а):
>
> datomics pull-api actually goes both ways with reverse-lookup [1]
>
> by using reverse lookups you could have the dashboard query look something
> like
>
> [{:dashboard/items [:item :name {:_cart [:id]}]
>
> (minus om/get-query things). Such a data-structure would make highlighting
> easy, just look if the attribute :_cart is non-nil.
>
> {:books [{:item 1 :name "Joy of Clojure" :_cart {:id "cart-id-1"}
> {:item 2 :name "Domain driven design"}
> {:item 3 :name "Thinking fast and slow"}]}
>
> I don't know exactly how to do this in om-next, but in Datomic this works
> quite well.
>
> [1] http://docs.datomic.com/pull.html#reverse-lookup
> <http://docs.datomic.com/pull.html#reverse-lookup>
>
> /Linus
>
> 2016-03-29 13:29 GMT+02:00 Serzh Nechyporchuk <nechyporc...@gmail.com
> <mailto:nechyporc...@gmail.com>>:
> Hi to everyone,
>
> I'm am very excited about the new version of Om. It really moves front-end
> developing to the new level, so you can deal with much bigger complexity.
>
> But I have one concern about it, that I can't resolve by myself.
> David talks all the time that client must have an ability to ask data and
> shape of that data from the server. So you have one API endpoint with
> datomic-pull like API to work this problem out. With this approach hierarchy
> of your components must always follow the hierarchy in your data. You can't
> change the "shape", you only can change keys you want in resulting map. Data
> flows only from top to the bottom and not in any other way. For example
>
> I have app data looks like this:
>
> {:books [{:item 1 :name "Joy of Clojure"}
> {:item 2 :name "Domain driven design"}
> {:item 3 :name "Thinking fast and slow"}]
> :cart [{:item 1 :name "Joy of Clojure"}]}
>
>
> And I have components:
>
> (defui Item
> static om/Ident
> (ident [this {:keys [id]}]
> [:item/by-id id])
> static om/IQuery
> (query [this]
> [:id :name]))
>
> (defui Dashboard
> static om/IQuery
> (query [this]
> `[{:dasboard/items ~(om/get-query Item)}]))
>
> (defui Cart
> static om/IQuery
> (query [this]
> [{:cart/items ~(om/get-query Item)}]))
>
> (defui RootView
> static om/IQuery
> (query [this]
> `[{:dashboard ~(om/get-query Dashboard)}
> {:cart ~(om/get-query Cart)}]))
>
>
> so I have Cart and Dashboard reuse same Item component.
>
> The task is to add Item to the Cart from Dashboard on click and highlight it
> as added. There are no problems with adding, but there is one problem with
> highlighting. So, there are two options:
> * just add flag to the Item that it is added
> * look at the cart/items when rendering items to see if it is added
> The first option adds some redundancy to the data, so the second is more
> preferable. For second option Item component should have :dashboard map as
> prop.
>
> So the whole problem that I can’t figure out how to do this, how to describe
> this in a query. So this, datomic-like, API allows you to create element
> hierarchy that can only follow the hierarchy in the data.
>
> Thank you.
>
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