Module toql_core::val_macro

Convenience macros to work with the Option type.

Use val! and rval!, if you expect Option to contain an value. The macro will fail with a ToqlError::NoneError, if Option is None.

Example

With a field like name: Option<String> in an object user you can write

use toql_core::{rval, val};
use toql_derive::Toql;

#[derive(Toql)]
struct User {
    #[toql(key)]
    id: u64,
    name: Option<String> // Selectable field
}

let user = User{ id: 5, name: Some("Peter".to_string())};

let name : &String = rval!(user.name).expect("Name is None.");
let name : String = val!(user.name).expect("Name is None.");

The macros are useful, because typical Toql derive structs contain a lot of selectable fields, which are optional. The macros make it more convenenient to get the values out of those fields.