How to query api.query.authorityDiscovery.keys?

Question

I'm trying to call api.query.authorityDiscovery.keys as is described here from rpc.polkadot.io like:

let current_auth_keys = await api.query.authorityDiscovery.keys();

and I keep getting:

TypeError: Cannot read property 'keys' of undefined

as if api.query does not have authorityDiscovery property/object contrary to what is written in the documentation. Could you tell me what am I getting wrong? I'm using:

"@polkadot/api": "^10.1.4"

Answer 1

Based on the Polkadot.js API source code you may access the list of keys from the current authority set using the following code:

import { ApiPromise, WsProvider } from '@polkadot/api';

async function main () {
  const wsProvider = new WsProvider('wss://rpc.polkadot.io');
  const api = await ApiPromise.create({ provider: wsProvider });
  let authorities = await api.call.authorityDiscoveryApi.authorities();
  console.log('authorities: ', authorities.toJSON());
}

main().catch(console.error).finally(() => process.exit());

Or just go to https://polkadot.js.org/apps/?rpc=wss%3A%2F%2Frpc.polkadot.io#/js, paste the following, and click the play icon to view the output on the right.

console.log((await api.call.authorityDiscoveryApi.authorities()).toJSON());

The previously available function api.query.authorityDiscovery appears to have now been removed and replaced with that Runtime call. The documentation is open-source and the Storage section doesn't appear to have been updated yet, but it does include api.call.authorityDiscoveryApi in the Runtime section here. For example, if you go to https://polkadot.js.org/apps/?rpc=wss%3A%2F%2Frpc.polkadot.io#/runtime, and choose endpoint authorityDiscoveryApi and authorities(), then click button 'Submit Runtime call', it will output the list of keys from the current authority set.