Improve VersionedMigration naming conventions (#2264)

As suggested by @ggwpez
(https://github.com/paritytech/polkadot-sdk/pull/2142#discussion_r1388145872),
remove the `VersionChecked` prefix from version checked migrations (but
leave `VersionUnchecked` prefixes)

---------

Co-authored-by: command-bot <>

polkadot/runtime/common/src/assigned_slots/migration.rs

@@ -25,8 +25,8 @@ use sp_std::vec::Vec;
 pub mod v1 {
 
 	use super::*;
-	pub struct MigrateToV1<T>(sp_std::marker::PhantomData<T>);
-	impl<T: Config> OnRuntimeUpgrade for MigrateToV1<T> {
+	pub struct VersionUncheckedMigrateToV1<T>(sp_std::marker::PhantomData<T>);
+	impl<T: Config> OnRuntimeUpgrade for VersionUncheckedMigrateToV1<T> {
 		#[cfg(feature = "try-runtime")]
 		fn pre_upgrade() -> Result<Vec<u8>, sp_runtime::TryRuntimeError> {
 			let onchain_version = Pallet::<T>::on_chain_storage_version();
@@ -60,13 +60,13 @@ pub mod v1 {
 		}
 	}
 
-	/// [`MigrateToV1`] wrapped in a
+	/// [`VersionUncheckedMigrateToV1`] wrapped in a
 	/// [`VersionedMigration`](frame_support::migrations::VersionedMigration), ensuring the
 	/// migration is only performed when on-chain version is 0.
-	pub type VersionCheckedMigrateToV1<T> = frame_support::migrations::VersionedMigration<
+	pub type MigrateToV1<T> = frame_support::migrations::VersionedMigration<
 		0,
 		1,
-		MigrateToV1<T>,
+		VersionUncheckedMigrateToV1<T>,
 		Pallet<T>,
 		<T as frame_system::Config>::DbWeight,
 	>;

polkadot/runtime/common/src/paras_registrar/migration.rs

@@ -60,11 +60,10 @@ impl<T: Config, UnlockParaIds: Contains<ParaId>> OnRuntimeUpgrade
 	}
 }
 
-pub type VersionCheckedMigrateToV1<T, UnlockParaIds> =
-	frame_support::migrations::VersionedMigration<
-		0,
-		1,
-		VersionUncheckedMigrateToV1<T, UnlockParaIds>,
-		super::Pallet<T>,
-		<T as frame_system::Config>::DbWeight,
-	>;
+pub type MigrateToV1<T, UnlockParaIds> = frame_support::migrations::VersionedMigration<
+	0,
+	1,
+	VersionUncheckedMigrateToV1<T, UnlockParaIds>,
+	super::Pallet<T>,
+	<T as frame_system::Config>::DbWeight,
+>;

polkadot/runtime/rococo/src/lib.rs

@@ -1472,14 +1472,14 @@ pub mod migrations {
 
 	/// Unreleased migrations. Add new ones here:
 	pub type Unreleased = (
-		pallet_society::migrations::VersionCheckedMigrateToV2<Runtime, (), ()>,
+		pallet_society::migrations::MigrateToV2<Runtime, (), ()>,
 		pallet_im_online::migration::v1::Migration<Runtime>,
 		parachains_configuration::migration::v7::MigrateToV7<Runtime>,
-		assigned_slots::migration::v1::VersionCheckedMigrateToV1<Runtime>,
+		assigned_slots::migration::v1::MigrateToV1<Runtime>,
 		parachains_scheduler::migration::v1::MigrateToV1<Runtime>,
 		parachains_configuration::migration::v8::MigrateToV8<Runtime>,
 		parachains_configuration::migration::v9::MigrateToV9<Runtime>,
-		paras_registrar::migration::VersionCheckedMigrateToV1<Runtime, ()>,
+		paras_registrar::migration::MigrateToV1<Runtime, ()>,
 		pallet_referenda::migration::v1::MigrateV0ToV1<Runtime, ()>,
 		pallet_referenda::migration::v1::MigrateV0ToV1<Runtime, pallet_referenda::Instance2>,
 

polkadot/runtime/westend/src/lib.rs

@@ -1549,12 +1549,12 @@ pub mod migrations {
 		pallet_im_online::migration::v1::Migration<Runtime>,
 		parachains_configuration::migration::v7::MigrateToV7<Runtime>,
 		pallet_staking::migrations::v14::MigrateToV14<Runtime>,
-		assigned_slots::migration::v1::VersionCheckedMigrateToV1<Runtime>,
+		assigned_slots::migration::v1::MigrateToV1<Runtime>,
 		parachains_scheduler::migration::v1::MigrateToV1<Runtime>,
 		parachains_configuration::migration::v8::MigrateToV8<Runtime>,
 		UpgradeSessionKeys,
 		parachains_configuration::migration::v9::MigrateToV9<Runtime>,
-		paras_registrar::migration::VersionCheckedMigrateToV1<Runtime, ()>,
+		paras_registrar::migration::MigrateToV1<Runtime, ()>,
 		pallet_nomination_pools::migration::versioned_migrations::V5toV6<Runtime>,
 		pallet_referenda::migration::v1::MigrateV0ToV1<Runtime, ()>,
 		pallet_nomination_pools::migration::versioned_migrations::V6ToV7<Runtime>,

polkadot/xcm/pallet-xcm/src/migration.rs

@@ -31,7 +31,7 @@ pub mod v1 {
 	/// checking, the version checking is not complete as it will begin failing after the upgrade is
 	/// enacted on-chain.
 	///
-	/// Use experimental [`VersionCheckedMigrateToV1`] instead.
+	/// Use experimental [`MigrateToV1`] instead.
 	pub struct VersionUncheckedMigrateToV1<T>(sp_std::marker::PhantomData<T>);
 	impl<T: Config> OnRuntimeUpgrade for VersionUncheckedMigrateToV1<T> {
 		fn on_runtime_upgrade() -> Weight {
@@ -65,7 +65,7 @@ pub mod v1 {
 	///
 	/// Wrapped in [`frame_support::migrations::VersionedMigration`] so the pre/post checks don't
 	/// begin failing after the upgrade is enacted on-chain.
-	pub type VersionCheckedMigrateToV1<T> = frame_support::migrations::VersionedMigration<
+	pub type MigrateToV1<T> = frame_support::migrations::VersionedMigration<
 		0,
 		1,
 		VersionUncheckedMigrateToV1<T>,

substrate/frame/society/src/migrations.rs

@@ -95,14 +95,13 @@ impl<
 
 /// [`VersionUncheckedMigrateToV2`] wrapped in a [`frame_support::migrations::VersionedMigration`],
 /// ensuring the migration is only performed when on-chain version is 0.
-pub type VersionCheckedMigrateToV2<T, I, PastPayouts> =
-	frame_support::migrations::VersionedMigration<
-		0,
-		2,
-		VersionUncheckedMigrateToV2<T, I, PastPayouts>,
-		crate::pallet::Pallet<T, I>,
-		<T as frame_system::Config>::DbWeight,
-	>;
+pub type MigrateToV2<T, I, PastPayouts> = frame_support::migrations::VersionedMigration<
+	0,
+	2,
+	VersionUncheckedMigrateToV2<T, I, PastPayouts>,
+	crate::pallet::Pallet<T, I>,
+	<T as frame_system::Config>::DbWeight,
+>;
 
 pub(crate) mod old {
 	use super::*;

substrate/frame/support/src/migrations.rs

@@ -51,7 +51,7 @@ use sp_std::marker::PhantomData;
 /// 	// OnRuntimeUpgrade implementation...
 /// }
 ///
-/// pub type VersionCheckedMigrateV5ToV6<T, I> =
+/// pub type MigrateV5ToV6<T, I> =
 /// 	VersionedMigration<
 /// 		5,
 /// 		6,
@@ -63,7 +63,7 @@ use sp_std::marker::PhantomData;
 /// // Migrations tuple to pass to the Executive pallet:
 /// pub type Migrations = (
 /// 	// other migrations...
-/// 	VersionCheckedMigrateV5ToV6<T, ()>,
+/// 	MigrateV5ToV6<T, ()>,
 /// 	// other migrations...
 /// );
 /// ```