Structure: Filter is required

Certain nodes within the Structure tool require a filter. A filter is the part of a GROQ query that specifies which documents should be matched — the constraints of a query, if you will.

Let's imagine you want to run a query to find all documents that do not currently have a slug set (in a field called slug). While the full GROQ query would look like this:

*[!defined(slug.current)]

The filter of the query on its own is:

!defined(slug.current)

Set a filter by calling the filter() method. Any filter other than a plain _type == $type check also needs apiVersion() — without it the Studio logs a warning to the console:

S.documentList()
  .title('Missing slug')
  .apiVersion('2025-02-19')
  .filter('!defined(slug.current)')