Attribute Macro projection 

#[projection]

Adds a cursor: String field and implements ProjectionCursor.

This attribute macro transforms a struct to track its position in the event stream. It automatically adds a cursor field and implements the ProjectionCursor trait.

Generated Code

• Adds pub cursor: String field
• Adds Default and Clone derives (preserves existing derives)
• Implements ProjectionCursor trait

Additional Derives

Pass additional derives as arguments:

#[evento::projection(serde::Serialize)]
pub struct MyView { ... }

Example

#[evento::projection]
#[derive(Debug)]
pub struct MyStruct {
    pub id: String,
    pub name: String,
}

// Generates:
// #[derive(Default, Clone, Debug)]
// pub struct MyStruct {
//     pub id: String,
//     pub name: String,
//     pub cursor: String,
// }
//
// impl evento::ProjectionCursor for MyStruct { ... }