Possible to render a Phlex fragment from an ERB turbo_stream block?

[nimmolo]

As I learned from this comment it works to pass a component as the second argument of turbo_stream.replace:

render turbo_stream: [
  turbo_stream.replace("a", Components::A.new),
  turbo_stream.replace("b", Components::B.new)
]

But is it possible to pass a fragment?

render turbo_stream: [
  turbo_stream.replace("a", Components::A.new(**args).call(fragments: ["A1"])),
  turbo_stream.replace("b", Components::B.new(**args).call(fragments: ["B1"]))
]

This is not working for me, I'm getting ActionView::Template::Error: wrong number of arguments (given 1, expected 0).

I guess I could make the fragment a sub-component.

[joeldrapper]

It's not possible. We should make it possible though. We could add a method that provides a Rails renderable that will trigger fragment rendering on the Phlex component.

[nimmolo]

Thanks for the quick response. I agree it would be useful. I ended up just making these fragments into sub-components, but they're kind of tiny and seem more like fragments, conceptually.

(OTOH I could be convinced that, at whatever point an element is going to be regularly replaced via turbo_stream, maybe it meets the functional definition of a sub-component.)

[joeldrapper]

I have just today run into a scenario where I want to be able to render a fragment of a component for a turbo stream. What are the chances? I’ll try to figure this out soon.

Using another component might be better. The advantage of fragments is just simplifying the developer experience. Your controller doesn’t need to know how to render each fragment, for example. It can just ask the view to render a specific fragment by name.