schedule_after
Call v133 → current #4Anonymously schedule a task to execute after a delay from the current block .
View calls on chainCall Workflow
This diagram shows the call execution flow: starting with schedule_after, passing through validation
(signature, nonce, mortality, fee payment), then pre-dispatch checks, followed by dispatch which emits events: Scheduled and modifies storage: Agenda, and finally post-dispatch where ExtrinsicSuccess is emitted and fees are settled.
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Used by: developersanalytics
The Big Picture
Convenience for relative timing - specify delay rather than absolute block number.
Use Cases
- Schedule operations with relative timing
- Implement delays without calculating blocks
From Chain Metadata
Anonymously schedule a task after a delay.
Input Parameters
| # | Name | Type | Description |
|---|---|---|---|
| 0 | after | u32 | after (u32) |
| 1 | maybe_periodic | Option | maybe_periodic (Option) |
| 2 | priority | u8 | priority (u8) |
| 3 | call | RuntimeCall | call (RuntimeCall) |
Permissions
Origin
Unknown
Required Role
Permission data inferred from metadata. May be incomplete.
Requirements
- Caller has permission
- Delay is at least 1 block
Effects
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 });
// Build schedule_after call
const after = 0;
const maybe_periodic = 0 as any /* Option */;
const priority = 0;
const call = 0 as any /* RuntimeCall */;
const call = api.tx[stringCamelCase("Scheduler")][stringCamelCase("schedule_after")](
after,
maybe_periodic,
priority,
call
);Runtime Info
- Pallet Index
- 15
- Call Index
- 4
- First Version
- v133
- Current Version
- v393