Watch a live product demo 👀 See how Sanity powers richer commerce experiences

Are there some limitations on -> when nested like this?

13 replies
Last updated: Oct 23, 2020
OK, so I have a document that contains an array objects, and each object have a reference to another document. GROQ, exemplified with books:

*[_type == "collection"] {

"title": collection_title,

"books": collection_books[]{

"title": collection_book->book_title,

"persons": collection_book->persons[]{

"type": type,

"firstname": person->firstname

}

}

}

Problem here is that
person->firstname
doesn't return anything. If I just write
person
then _ref and _type is returned as expected, but -> doesn't seem to work. Are there some limitations on -> when nested like this?
Oct 18, 2020, 3:05 PM
Try
person->.firstname
and if they’re already named
type
and
firstname
you could try

{
  type,
  person->.firstname
}
Oct 18, 2020, 3:46 PM
Sorry, Theo, but doesn't help. But, thanks! type is returned correctly, as that is a value in the object, but person-> is a reference, and doesn't return anything.
If I use
person->.firstname
instead of
"firstname": person->.firstname
I get an error: "Must be an attribute or a string key".
Oct 18, 2020, 3:55 PM
try
"firstname": @->.firstname
Oct 19, 2020, 11:30 AM
@
denotes the current item in the array
Oct 19, 2020, 11:30 AM
@
denotes the current item in the array
Oct 19, 2020, 11:30 AM
Actually, it depends on your data structure, so an example document would help
Oct 19, 2020, 11:33 AM
try
"firstname": @->.firstname
Oct 19, 2020, 11:30 AM
I solved this particular case by rewriting the structure of the query to a more suitable format. Anyways, I ran into another case of the same:

 "files": collection_set->set_downloads[]{
        "comments": download_comments,
        "type": download_type,
        "url": download_file.asset->url
    },
comments and type works fine, but url returns nothing. I "hacked" it by doing some string replacements on
download_file.asset["_ref"]
instead, but should be fixed the correct way. Tried with @, but no luck. Some relevant schemas attached.
Oct 19, 2020, 5:55 PM
user J
☝️
Oct 22, 2020, 6:16 PM
That looks correct to me. Is it a public dataset? If so you could send me an http url with query and I could tinker with it to see if there's something we're missing
Oct 22, 2020, 6:43 PM
Sure! See PM. Thanks!
Oct 22, 2020, 6:55 PM
This seems to work, you get the extra
set_downloads
level, tho. But at least you get the url
*[_type == 'collection']{
  "files": collection_sets[]{
    ...@.collection_set->{
      set_downloads[]{
        "comments": download_comments,
        "type": download_type,
        "url": download_file.asset->url
      }
    }
  }
}
Oct 22, 2020, 7:14 PM
Thanks, this works!
Oct 23, 2020, 6:40 AM

Sanity– build remarkable experiences at scale

The Sanity Composable Content Cloud is the modern content platform that treats content as data to power your digital business. Free to get started, and pay-as-you-go on all plans.

Categorized in

Related answers

Get more help in the community Slack

TopicCategoriesFeaturedRepliesLast Updated
After adding the subtitle and running this code npm run graphql-deploy It does nothingSep 15, 2020
how to limit a reference to just one entry in Studio reference input side versus the default as-many-entries-as-you-fill-in-an-array...Sep 18, 2020
Is it possible to fetch more than one "_type" using GROQ?Nov 2, 2020
I want to add a view with the Structure builder (S.view.component) where I list similar documents based on the title. What...Sep 23, 2020
Is there a structure builder example where the format of each preview for the document list is modified?Feb 3, 2021
I have an array of references to a country schema type but it always just returns NULL values for meJan 30, 2021
Hi, I need help with a query for getting the url of an image asset. Here is what I've been trying, but I only get the _ref...Dec 1, 2020
Sanity UI looks brilliant :smiley: Is something like the current date picker possible at the moment? I’m not sure if anicon...Dec 21, 2020
Hey everyone. I have been coding and may have potentially accidentally deleted something. Does anyone know how to resolve...Dec 26, 2020
Hello everyone and happy new year :raised_hands::skin-tone-2:, I have a problem with outputting Portable Text :disappointed:...Jan 1, 2021

Related contributions

Clean Next.js + Sanity app
- Template

Official(made by Sanity team)

A clean example of Next.js with embedded Sanity ready for recomposition.

Cody Olsen
Go to Clean Next.js + Sanity app

Blog with Built-in Content Editing
- Template

Official(made by Sanity team)

A Sanity-powered blog with built-in content editing and instant previews.

Go to Blog with Built-in Content Editing