insert an object that has a record<something>

[mrpanam]

in Surreal db i have 2 tables: category & product

DEFINE TABLE category SCHEMALESS;
DEFINE FIELD name ON category TYPE string;

DEFINE TABLE product SCHEMALESS;
DEFINE FIELD name ON product TYPE string;
DEFINE FIELD price ON product TYPE float;
DEFINE FIELD qty ON product TYPE int;
DEFINE FIELD category ON product TYPE record <category>;

using Rust sdk i want to insert a new product in db. all my categories are already existing in db , issue is that when i try to save the product Surreal is expecting a record.

here is simplified Rust code:
models:

#[derive(Debug, Serialize, Deserialize)]
pub struct Product {
    pub name: String,
    pub qty: i64,
    pub price: f64,
    pub category: Category,
}
#[derive(Debug, Serialize, Deserialize)]
pub struct Category {
    pub name: String,
}

function to create product with a category that already exists in db, example:
{
id: category:Fruits,
name: 'Fruits'
}

pub async fn create_product(db: &Surreal<Any>) -> Result<(), Error> {
    let _: Option<Product> = db
        .create("product")
        .content(Product {
            name: "Banana".to_string(),
            qty: 100,
            price: 5.45,
            category: Category {
                name: "Fruits".to_string(),
            },
        })
        .await?;

    println!("Product created");
    Ok(())
}

Error: Api(Query("There was a problem with the database: Found { name: 'Fruits' } for field category, with record product:12niu1utrnh0gdoha8yo, but expected a record category"))

i also tried touse surrealdb::sql::Thing; but not working either.