HasMigrationRun

Storage Map v165 → current

Tracks which migrations have been executed.

Queried by: developersvalidators

The Big Picture

Runtime upgrades may require one-time migrations. This storage tracks which have run to prevent accidental re-execution. Maps migration identifiers to boolean status.

Use Cases

Check migration status
Debug upgrade issues
Build migration monitoring tools

Purpose & Usage

Purpose

Prevent duplicate execution of one-time migrations.

Common Query Patterns

Query by migration name/key

Query Keys

#	Name	Type	Description
1	key1	Vec<u8> Vec	key1 (Vec<u8>)

Stored Value

bool

value (bool)

Code Examples

import { ApiPromise, WsProvider } from "@polkadot/api";
import { stringCamelCase } from "@polkadot/util";

const provider = new WsProvider("wss://entrypoint-finney.opentensor.ai:443");
const api = await ApiPromise.create({ provider });

// Query HasMigrationRun storage
const key1 = 0;

const result = await api.query
  [stringCamelCase("SubtensorModule")]
  [stringCamelCase("HasMigrationRun")](
  key1
);

console.log("HasMigrationRun:", result.toHuman());

Runtime Info

View Source

Pallet: SubtensorModule
Storage Kind: Map
First Version: v165
Current Version: v393

Back to SubtensorModule Storage