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[doc] Example MBM pallet (#2119)

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## Basic example showcasing a migration using the MBM framework

This PR has been built on top of
https://github.com/paritytech/polkadot-sdk/pull/1781 and adds two new
example crates to the `examples` pallet

### Changes Made:

Added the `pallet-example-mbm` crate: This crate provides a minimal
example of a pallet that uses MBM. It showcases a storage migration
where values are migrated from a `u32` to a `u64`.

---------

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Co-authored-by: Liam Aharon <liam.aharon@hotmail.com>
This commit is contained in:
Juan Girini
2024-04-04 13:47:24 +02:00
committed by GitHub
parent 0ef37c7540
commit bcb4d137c9
17 changed files with 686 additions and 11 deletions
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substrate/frame/migrations/src/mock.rs
+5 -6
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@@ -28,7 +28,7 @@ use frame_support::{
weights::Weight,
};
use frame_system::EventRecord;
use sp_core::{ConstU32, H256};
use sp_core::H256;
type Block = frame_system::mocking::MockBlock<Test>;
@@ -51,15 +51,14 @@ frame_support::parameter_types! {
pub const MaxServiceWeight: Weight = Weight::MAX.div(10);
}
#[derive_impl(crate::config_preludes::TestDefaultConfig)]
impl crate::Config for Test {
type RuntimeEvent = RuntimeEvent;
#[cfg(feature = "runtime-benchmarks")]
type Migrations = crate::mock_helpers::MockedMigrations;
#[cfg(not(feature = "runtime-benchmarks"))]
type Migrations = MockedMigrations;
type CursorMaxLen = ConstU32<65_536>;
type IdentifierMaxLen = ConstU32<256>;
type MigrationStatusHandler = MockedMigrationStatusHandler;
type FailedMigrationHandler = MockedFailedMigrationHandler;
type MaxServiceWeight = MaxServiceWeight;
type WeightInfo = ();
}
frame_support::parameter_types! {