IfElseFallbackCalled

Event v320 → current #7

Emitted when the main call failed and fallback was executed.

View events on chain
Useful for: developerswallets

The Big Picture

Main call failed, so fallback was executed.

Use Cases

  • Track fallback execution

From Chain Metadata

The fallback call was dispatched.

Triggers

Emitted by

if_else

Preconditions

  • if_else executed
  • Main failed

Effects

Postconditions

  • Fallback executed

Side Effects

  • Main error available

Event Data

#NameTypeDescription
0
main_error
DispatchError Error from the main call that triggered fallback

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 });

// Subscribe to IfElseFallbackCalled events
api.query.system.events((events) => {
  events
    .filter(({ event }) =>
      event.section === stringCamelCase("Utility") &&
      event.method === "IfElseFallbackCalled"
    )
    .forEach(({ event }) => {
      console.log("IfElseFallbackCalled:", event.data.toHuman());
    });
});

Runtime Info

Pallet Index
11
Event Index
7
First Version
v320
Current Version
v393
Back to Utility Events