How to delegate a schema's preview to one of its fields in Sanity.io.

Hi all. Is there a way to "delegate" a schema's preview to one of its field? For instance, if a

Song

document were to have a field

artist

of document type

Artist

, how can I write a preview for

Song

such that it uses the preview of

Artist

to preview its

artist

field without copying over the code?

Hey User! Here’s a guide for configuring your preview to show fields from referenced documents .

Thanks ! I had read through this already, but I don't want to show fields from referenced documents, I want to delgate the presentation that's defined in the referenced document. Whichever manner the referenced document's presentation is defined (with or without

media

, for instance), I want to have that same presentation without copying the code for the referenced document's presentation over and manually nesting the paths. Does this make sense?

I’m afraid I don’t understand, actually! Are you trying to have the referenced document define the preview on the document doing referencing, so that they effectively have the same preview?

That's it. So with type

A

having a field

b

referencing

B

, I would like an instance of

A

to preview just as if I was previewing its field

b

. But do it in such a way that the preview definition of

A

knows treats the logic for the preview of

B

as a black box.
Without the latter constraint I could just duplicate the code, and prefix all select paths with

b.

, but this create a rather tricky situation for code maintenance as my intention is now non-trivially duplicated.
Now that I say it out loud, I suppose I could define the preview logic as a reusable function:


And then evaluate this without arguments for

B

and with prefix

b.

for

A

.

Ah, got it! Thanks for bearing with me while I tried to understand! The one thing I think you're going to struggle with here is that the

preview

function cannot handle async and you would need that to get the details of the referenced document.