Trait Observer

pub trait Observer<M> {
    // Provided methods
    async fn created(model: &mut Model<'_, M>) -> MongodbResult<()> { ... }
    async fn updated(model: &mut Model<'_, M>) -> MongodbResult<()> { ... }
    async fn deleted(model: &mut Model<'_, M>) -> MongodbResult<()> { ... }
}

This trait implement by default for Model but if user wants to override and use it must tell to Model macro

#[Model(coll_name = "users", observer)]
#[derive(Serialize, Deserialize, Debug, Default)]
struct User {
   name: String,
}

Provided Methods

async fn created(model: &mut Model<'_, M>) -> MongodbResult<()>

this call when document is created , in these observers can’t call save again

async fn updated(model: &mut Model<'_, M>) -> MongodbResult<()>

this call when document is updated it just called when user uses save method not update method

async fn deleted(model: &mut Model<'_, M>) -> MongodbResult<()>

this call when document is delete

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors