Function set_flash

basics/todo/src/session.rs:7–9

(session: &Session, flash: FlashMessage)

const FLASH_KEY: &str = "flash";

pub fn set_flash(session: &Session, flash: FlashMessage) -> Result<()> {
    Ok(session.insert(FLASH_KEY, flash)?)
}

pub fn get_flash(session: &Session) -> Result<Option<FlashMessage>> {
    Ok(session.get::<FlashMessage>(FLASH_KEY)?)