Om.next: Render recursive component

[Feifan Zhou]

Hello,
I have a a data structure that looks like this:

{:data "foo"
:children {
:data "bar"
:children {
:data "baz"}}}

I'd like to render it into components like this:

<Comp>
foo
<Comp>
bar
<Comp>
baz
</Comp>
</Comp>
</Comp>

Conceptually it makes sense to recurse over the data structure to generate the view, but AFAIK the Om.next component has to be turned into a factory (via a separate `def`) before it can be used in Comp's `render`. Since `def`s aren't hoisted, how would I go about referencing the factory in the `render`?

[António Monteiro]

There are examples of recursive components in the Om repository. Here's the link: for the particular examples: https://github.com/omcljs/om/blob/master/src/devcards/om/devcards/core.cljs#L242-L408

I have also written 2 blog posts that cover recursive queries and components with Om Next. I hope you find them useful:
http://anmonteiro.com/2016/01/exploration-patterns-om-next-part-1/
http://anmonteiro.com/2016/01/exploration-patterns-om-next-part-2/

[Feifan Zhou]

Thanks António! The key was actually just the `declare` form — I didn't realize it was possible to do forward declarations in Clojure.

What would be the advantage of destructuring the component into Composite/Component/Leaf vs having just one component that maps over its children recursively?

[António Nuno Monteiro]

They are just different scenarios. In my simple examples I merely wanted to showcase the example of heterogeneous components, i.e. components which may not share the same query. In that case, different components and union recursion is the way to go.

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