Derive Macro EntityType 

#[derive(EntityType)]
{
    // Attributes available to this derive:
    #[table]
    #[primary_key]
    #[auto_increment]
    #[required]
    #[max_length]
    #[column]
    #[foreign_key]
    #[navigation]
    #[not_mapped]
    #[index]
    #[unique]
    #[through]
    #[concurrency_check]
    #[context]
}