Macro svec

macro_rules! svec {
    [$($v:tt),*] => { ... };
    () => { ... };
}

Helper macro to build a Vec<String>

Quite a few ORM methods take Vec<String> as an argument. Using the built-in vec![] macro requires that each element is converted into a String, which is very cumbersome.

Using this macro, we can write:

let fields = svec!["string", "literals", "without", "to_string()"];