Events (ActiveModelBehavior)

Sea-ORM provides lifecycle hooks through the ActiveModelBehavior trait, allowing you to execute logic before or after database operations.

Available Hooks

impl ActiveModelBehavior for ActiveModel {
    /// Called before saving (insert or update)
    fn before_save<C>(self, _db: &C, insert: bool) -> Result<Self, DbErr>
    where C: ConnectionTrait {
        let mut this = self;
        if insert {
            this.created_at = Set(chrono::Utc::now());
        }
        this.updated_at = Set(chrono::Utc::now());
        Ok(this)
    }

    /// Called after saving (insert or update)
    fn after_save<C>(model: Model, _db: &C, insert: bool) -> Result<Model, DbErr>
    where C: ConnectionTrait {
        tracing::info!("Model saved: {:?}", model.id);
        Ok(model)
    }

    /// Called before deleting
    fn before_delete<C>(self, _db: &C) -> Result<Self, DbErr>
    where C: ConnectionTrait {
        tracing::warn!("Deleting model");
        Ok(self)
    }
}

Use Cases

• Auto-timestamps: Automatically set created_at and updated_at
• Audit logging: Log all data modifications
• Validation: Additional business rule validation before save
• Cascade operations: Perform related operations on save/delete