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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_helpers.rs
+1 -1
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@@ -79,7 +79,7 @@ impl SteppedMigrations for MockedMigrations {
let mut count: u32 =
cursor.as_ref().and_then(|c| Decode::decode(&mut &c[..]).ok()).unwrap_or(0);
log::debug!("MockedMigration: Step {}", count);
log::debug!("MockedMigration: Step {count} vs max {steps}");
if count != steps || matches!(kind, TimeoutAfter) {
count += 1;
return Some(Ok(Some(count.encode())))