Save

This is a helper method to save (insert / update) ActiveModel into the database.

Save Behaviour

When saving an ActiveModel, it will perform either insert or update depending on the primary key attribute:

• Insert if primary key is Unset
• Update if primary key is Set or Unchanged

Usage

Calling save to insert or update an ActiveModel.

let banana = fruit::ActiveModel {
    id: Unset(None), // unset primary key explicitly
    name: Set("Banana".to_owned()),
    ..Default::default() // all other attributes are `Unset`
};

// Insert, because primary key `id` is `Unset`
let mut banana = banana.save(db).await?;

banana.name = Set("Banana Mongo".to_owned());

// Update, because primary key `id` is `Set`
let banana = banana.save(db).await?;