Add custom rpc not work

[Kayryu]

I want to add a custom rpc interface, but it doesn't work.
here is example:

const { ApiPromise } = require('@polkadot/api');
const { WsProvider } = require('@polkadot/rpc-provider');
const provider = new WsProvider('ws://127.0.0.1:9944/');
const options = {
  provider: provider,
  rpc: {
    custom: [
      {
        name: 'foo',
        params: [
          {
            name: 'data',
            type: 'U32'
          }
        ],
        section: 'custom',
        type: 'U32'
      }
    ]
  }
}
// Create the API and wait until ready
ApiPromise.create(options).then(api => {
  return api.rpc.custom.foo(1)
}).then(console.log)

Error message:

UnhandledPromiseRejectionWarning: TypeError: api.rpc.custom.foo is not a function

dependencies:

"@polkadot/api": "^0.99.0-beta.16",

[Kayryu]

This problem is caused by substrate side.

Here is error code I previously defined:

#[rpc]
pub trait CustomApi<BlockHash> {
	/// test foo
	#[rpc(name = "foo")]
	fn foo(&self, data: u32) -> Result<u32>;
}

It should use #[rpc(name = "custom_foo")] to replace #[rpc(name = "foo")]

[polkadot-js-bot]

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