call_old_weight
Call v334 → current #0Legacy call interface using old weight format (deprecated).
View calls on chainCall Workflow
This diagram shows the call execution flow: starting with call_old_weight, passing through validation
(signature, nonce, mortality, fee payment), then pre-dispatch checks, followed by dispatch which emits events: ContractEmitted, Called, DelegateCalled and modifies storage: ContractInfoOf, and finally post-dispatch where ExtrinsicSuccess is emitted and fees are settled.
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Used by: developers
The Big Picture
When Substrate changed weight representation, old call signatures became incompatible. This preserves the old interface for tools that haven't updated. Functionally identical to Contracts.call, just with legacy weight parameters.
Use Cases
- Support old tools/libraries not updated to new weight format
- Backward compatibility during transition periods
From Chain Metadata
Deprecated version if [`Self::call`] for use in an in-storage `Call`.
Input Parameters
| # | Name | Type | Description |
|---|---|---|---|
| 0 | dest | MultiAddress | dest (MultiAddress) |
| 1 | value | Compact<u64> Cpt | Value in RAO (÷10⁹ for TAO) (RAO -> TAO (/ 10^9)) |
| 2 | gas_limit | Compact<u64> Cpt | gas_limit (Compact<u64>) (SCALE compact -> integer) |
| 3 | storage_deposit_limit | Option | storage_deposit_limit (Option) |
| 4 | data | Vec<u8> Vec | data (Vec<u8>) |
Permissions
Origin
Unknown
Required Role
Permission data inferred from metadata. May be incomplete.
Requirements
- Same as Contracts.call
- Used for backward compatibility with old tooling
Effects
Events Emitted
Storage Modified
Postconditions
- Same as Contracts.call
Side Effects
- Same as Contracts.call
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 call_old_weight call
const dest = 0 as any /* MultiAddress */;
const value = 0;
const gas_limit = 0;
const storage_deposit_limit = 0 as any /* Option */;
const data = 0;
const call = api.tx[stringCamelCase("Contracts")][stringCamelCase("call_old_weight")](
dest,
value,
gas_limit,
storage_deposit_limit,
data
);Runtime Info
- Pallet Index
- 29
- Call Index
- 0
- First Version
- v334
- Current Version
- v393