#[derive(cynic::QueryFragment, Debug, Clone, Serialize)]
pub struct Product {
    pub id: cynic::Id,
    #[cynic(flatten)]
    pub variants: Vec<ProductVariant>,
    pub name: String,
    //#[cynic(default)]: the trait bound `std::option::Option<Jsonstring>: IsScalar<JSONString>` is not satisfied
   //#[serde(default)]: doesn't do anything
    pub description: Option<Jsonstring>,
    pub category: Option<Category>,
    pub weight: Option<Weight>,
}

#[tokio::main]
async fn main() {
    // called `Result::unwrap()` on an `Err` value: Error("missing field `category`", line: 12, column: 3)
    let products: Vec<Product> = serde_json::from_str(&HUGE_JSON).unwrap();
    println!("{:?}", products);
}

const HUGE_JSON: &str = r##"
[
  {
    "id": "product:⟨UHJvZHVjdDoxMzE=⟩",
    "name": "Grey Hoodie",
    "variants": [],
    "weight": {
      "unit": "KG",
      "value": 0.0
    }
  }
]"##;