Content relationship fields inside a group

Developing with Prismic
3

Hi @filippo.bovo. I think that your GraphQuery will look something like this:

{
  your_custom_type {
    ...your_custom_typeFields
    promo_blocks_group {
      promo_blocks {
        ...on promo_block {
          ...promo_blockFields
        }
      }
    }
  }
}

Give that a try and let me know if it works for you. Keep in mind that you’ll need to update your_custom_type and your_custom_typeFields with the API ID of the Custom Type that you are querying.

Also as a general note for anyone reading this, GraphQuery is different than GraphQL. GraphQuery is an updated version of fetchLinks which allows you to retrieve content from a Content Relationship field when using the REST API. Here is the documentation for GraphQuery:
https://prismic.io/docs/rest-api/query-the-api/graphquery