Trait near_contract_tools::migrate::MigrateHook

pub trait MigrateHook: MigrateController {
    fn on_migrate(
        old_schema: <Self as MigrateController>::OldSchema
    ) -> <Self as MigrateController>::NewSchema;
}

Called on migration. Must be implemented by the user. (The derive macro does not implement this for you.)

Required Methods

fn on_migrate(
    old_schema: <Self as MigrateController>::OldSchema
) -> <Self as MigrateController>::NewSchema

Receives the old schema deserialized from storage as well as optional arguments from caller, and replaces it with the new schema.

Implementors