Expand description
Implements storage migrations of pallet-session-validator-management.
Important: It is crucial to run the migrations when upgrading runtime to a version containing this pallet’s storage version. Failing to do so WILL break the chain and require a wipe or a rollback.
To schedule a migration, add it to the Executive definition for your
runtime like this:
pub type Migrations = (
pallet_session_validator_management::migrations::v1::LegacyToV1Migration<Runtime>,
// ...
);
/// Executive: handles dispatch to the various modules.
pub type Executive = frame_executive::Executive<
Runtime,
Block,
ChainContext,
Runtime,
AllPalletsWithSystem,
Migrations,
>;Each migration will be run only once, for the storage version for which it is defined, and will update the storage version number.
§V1 (v1.6.0+)
§Changes
This version changes the type used to store committee member information
from a tuple (T::AuthorityId, T::AuthorityKeys) to a generic type
T::CommitteeMember. This type can be arbitrary within normal
constraints of Substrate runtime types and must implement the
CommitteeMember trait. If your runtime uses authority-selection-inherents
to select its committee, use the CommitteeMember type provided by this crate.
A CommitteeMember implementation for the legacy (T::AuthorityId, T::AuthorityKeys)
type is also provided and can be used.
§Migration from Legacy
Migration logic is provided by the migrations::v1::LegacyToV1Migration migration.
It assumes that the types T::AuthorityId and T::AuthorityKeys do not change as
part of the same runtime upgrade. The only requirement for the new type
T::CommitteeMember is to implement the trait From<(T::AuthorityId, T::AuthorityKeys)>.