I’m surprised that Rails does not seem to extend custom renderers to turbo streams.

Given a custom renderer :foo, in controllers you can do:

render foo: ...

But it won’t let you do:

turbo_stream.update(..., foo: ...)

If you try, it will raise “You invoked render but did not give any of :body, :file, :html, :inline, :partial, :plain, :renderable, or :template option.”

Presumably, that’s because calls to turbo-stream actions already happen as part of another call to render with the option :turbo_stream.

I could write my own custom turbo-stream action (turbo_stream.foo(...)), but that doesn’t really seem like the right place for that and it wouldn’t be as idiomatic.

Is there any way to get the syntax I want?