How to convert Vec to JsonValue in Rust - json

Question

I am querying my database and getting an Vec<Bookable> struct, using diesel library.
#[derive(QueryableByName)]
pub struct Bookable {
#[sql_type = "BigInt"]
pub id: i64,
#[sql_type = "Text"]
pub title: String
}
When I query the elements, I can access the result, but it's not possible to convert the Vec<Bookable> to json! macro:
pub fn get_terms(conn: &MysqlConnection) -> Vec<Bookable> {
diesel::sql_query(r#"SELECT title, LAST_INSERT_ID() 'id' from bookable_term;"#)
.load::<Bookable>(conn).expect("Query failed")
}
And later I call it this way:
let conn = connect();
let terms = bookable::get_terms(&conn);
json!({ "data": {
"items": terms }
})
The question is how to put the terms into this object and send the whole array to the API? I can stringify a json like this:
"items:" &vec!["to", "be", "or", "not", "to", "be"]
But when it comes to an existing Vec I get compiler error. I am using Rocket so it provides a rocket_contrib::json::JsonValue which holds json! macro

Answer 1

First, you derive your struct like -
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use rocket_contrib::{json::{Json}};
#[derive(QueryableByName, Deserialize, Serialize)]
pub struct Bookable {
#[sql_type = "BigInt"]
pub id: i64,
#[sql_type = "Text"]
pub title: String
}
Then you can do something like -
let conn = connect();
let terms = bookable::get_terms(&conn);
let mut data: Vec<Bookable> = HashMap::new();
data.insert("data", terms);
return Json(Vec<Bookable>);
Json(Vec<Bookable>) will also set the content-type as json for the response.