How to access parent field from reference context using @ in GROQ?

Based on your question, it sounds like you're looking for the parent operator (^) rather than the @ operator. This is a common point of confusion in GROQ!

The @ operator represents the current scope - whatever object you're currently working with. It doesn't let you access fields from outside the current context. The ^ operator is what you need to access parent scope values.

Here's how to read the isSignLanguage field from outside your rightsList reference context:

{
  ...,
  "rightsList": rightsList[]-> {
    ...,
    "parentIsSignLanguage": ^.^.isSignLanguage
  }
}

Let me break down what's happening:

• First ^ - moves up from the dereferenced document back to the array element context
• Second ^ - moves up from the array element to your parent document where isSignLanguage lives

The number of ^ operators you need depends on how many scope levels deep you are. In your case with rightsList[]->, you're two levels deep (array projection and reference dereferencing), so you need ^.^.

Important note: There was a bug with the parent operator that was fixed in API version 2021-03-25. If you're using an older API version, the parent operator might not work correctly. Make sure you're using a recent API version.

The confusion between @ and ^ is understandable since both use special symbols, but remember:

• @ = current scope (what you're looking at right now)
• ^ = parent scope (go up one level)

You can chain multiple ^ operators like ^.^.^.fieldName to traverse multiple levels up in your query hierarchy.