Check if columns in ActiveModel are set

Given a ActiveModel object, one can check if a specific column is set:

#![allow(unused)]
fn main() {
let object: table::ActiveModel = { ... };

// Specific field
object.field_name.is_set()  // <- do something with this boolean

// Field iterator
for column in table::Column::iter() {
    object.get(column).is_set() // <- do something with this boolean
}
}