@DgsEntityFetcher(name = "Listing")
public Listing resolveListingReference(Map<String, Object> entityRepresentation) {
    String id = (String) entityRepresentation.get("id");
    Listing listing = new Listing();
    listing.setId(id);  
    return listing;
}

public class ReviewDto extends Review {

  @Override
  public String getId() {
      return id;
  }
  
  public void setId(int id) {
      this.id = String.valueOf(id);
  }
  
  public String id;
  
  public String getListing() {
      return listing;
  }
  
  public void setListing(String listing) {
      this.listing = listing;
  }
  
  public String listing;

@DgsData(parentType="Listing")
public Flux<ReviewDto> reviews(DgsDataFetchingEnvironment dfe) {
    Listing listing = dfe.getSource();
    String id = listing.getId();
    return this.reviewController.reviewsForListing(id);
}

{
  "data": {
    "listing": {
      "title": "Cave campsite in snowy MoundiiX",
      "description": "Enjoy this amazing cave campsite in snow MoundiiX, where you'll be one with the nature and wildlife in this wintery planet. All space survival amenities are available. We have complementary dehydrated wine upon your arrival. Check in between 34:00 and 72:00. The nearest village is 3AU away, so please plan accordingly. Recommended for extreme outdoor adventurers.",
      "numOfBeds": 2,
      "amenities": [
        {
          "name": "Towel",
          "category": "Accommodation Details"
        },
        {
          "name": "Oxygen",
          "category": "Space Survival"
        },
        {
          "name": "Prepackaged meals",
          "category": "Space Survival"
        },
        {
          "name": "SOS button",
          "category": "Space Survival"
        },
        {
          "name": "Meteor shower shield",
          "category": "Space Survival"
        },
        {
          "name": "First-aid kit",
          "category": "Space Survival"
        },
        {
          "name": "Water recycler",
          "category": "Space Survival"
        },
        {
          "name": "Panic button",
          "category": "Space Survival"
        },
        {
          "name": "Emergency life support systems",
          "category": "Space Survival"
        },
        {
          "name": "Universal translator",
          "category": "Space Survival"
        },
        {
          "name": "Aquatic breathing aid",
          "category": "Space Survival"
        },
        {
          "name": "Acid lake access",
          "category": "Outdoors"
        },
        {
          "name": "Time travel paradoxes",
          "category": "Outdoors"
        },
        {
          "name": "Meteor showers",
          "category": "Outdoors"
        },
        {
          "name": "Wildlife",
          "category": "Outdoors"
        }
      ],
      "overallRating": 3.75,
      "reviews": [
        {
          "id": "1",
          "text": "Wow, what an experience! I've never stayed in a cave before, so I was a little unprepared. Luckily, this listing had all the amenities I needed to feel safe and prepared for anything."
        },
        {
          "id": "2",
          "text": "100% enjoyed the wilderness experience. Do not book if you are not an adventurer and lover of the outdoors."
        },
        {
          "id": "3",
          "text": "I thought this was going to be a cozy cave, but I was sorely disappointed. The mattress was hard, I could feel stones digging into my back. And it was COLD. They need to be more clear about this on the description."
        },
        {
          "id": "6",
          "text": "Description was accurate. It was indeed a cave campsite in the snowy part of the planet. Exactly what I needed."
        }
      ]
    }
  }
}

type Review {
  # ... other Review fields
  listing: Listing!
}

query GetAllReviews {
  allReviews {
    id
    text
    listing {
      title
    }
  }
}

{
  "__typename": "Listing",
  "id": "listing-3"
}