How do you send data to a promise invocation?

[mattpeskett]

I'm using services that return promises extensively in my state machine. I'd like to send arguments to those services to perform some basic routing logic but I can't see a way to send arguments to those promises. Is there a way I can achieve this?

[davidkpiano]

You can use data to do that:

// ...
invoke: {
  src: 'fetchUser',
  data: { id: (ctx) => ctx.userId }
},

// ...

services: {
  fetchUser: (ctx, event, { data }) => {
    return fetchUserFromAPI(data.id);
  }
}

Or do you mean something else? Can you show in code what you want to do?

[mattpeskett]

Actually, I got a bit of a different result with 4.11.0. The third parameter to the fetchUser function isn't undefined, its

{
   data: "undefined"
}

So still not what I expected but I'm at least getting a third parameter now.

[davidkpiano]

Can you share your full code via CodeSandbox?

[mattpeskett]

I haven't used code sandbox before so I didn't get it running but I put the basics of what I'm doing here https://codesandbox.io/s/youthful-hamilton-k09ph?file=/src/index.js. Thanks for the ongoing help btw!

[Andarist]

I couldn't run your codesandbox for some reason (I expect the problem on their side) but I've copy-pasted your code (and fixed it a little bit - you might have forgot to save some changes) and it seems to work OK. Check this out: https://codesandbox.io/s/dank-water-s27ku?file=/src/index.js

[mattpeskett]

Thanks @davidkpiano and @Andarist. My issue seems to have disappeared and it works exactly as you've explained. Thanks for your help.