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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