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Version: 0.4.x


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


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

// Update, because primary key `id` is `Set`
let banana =;