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theres absolutely no guide as to how to send an er...

# help

Marko Bilal

01/24/2022, 12:19 AM

theres absolutely no guide as to how to send an error message back

Frank

01/24/2022, 4:54 AM

Hey @Marko Bilal, found some examples here: • https://docs.aws.amazon.com/appsync/latest/devguide/tutorial-lambda-resolvers.html#returning-errors • https://stackoverflow.com/questions/53493889/how-to-send-custom-error-in-appsync-with-util-error Let me know if these works.

Marko Bilal

01/24/2022, 3:56 PM

thanks for following up, I actually searched all over for answers and I tried a bunch of these articles but nothing seems to actually propagate the error message thru the mapping

Marko Bilal

01/24/2022, 3:57 PM

That 2nd link i dont even know ow do you put that template into the appsync stack class ?

Marko Bilal

01/24/2022, 3:57 PM

just use the fromString helper?

Frank

01/25/2022, 2:19 AM

Following the AWS example above, it seems to work for me. Here’s my schema:

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type Query {
  foo: String
}

Here’s the Lambda resolver:

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exports.handler = (event, context, callback) => {
    callback("I fail.");
};

Here’s the query response:

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{
  "data": {
    "foo": null
  },
  "errors": [
    {
      "path": [
        "foo"
      ],
      "data": null,
      "errorType": "string",
      "errorInfo": null,
      "locations": [
        {
          "line": 2,
          "column": 3,
          "sourceName": null
        }
      ],
      "message": "I fail"
    }
  ]
}

Marko Bilal

01/25/2022, 10:34 PM

really appreciate the help @Frank

Marko Bilal

01/26/2022, 1:57 PM

But my handler signature is

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export async function handler(
  event: ClanEvent
): Promise<
  | Record<string, unknown>[]
  | boolean
  | Clan[]
  | ActionResponse
  | SamuraiResult
  | undefined
  | string
  | Samurai
  | null
> {

Marko Bilal

01/26/2022, 1:58 PM

so in there is a switch case that returns the different resolvers based on event arguments...I wanna just be able to throw an error from any of those resolvers and have it arrive to the client

Marko Bilal

01/26/2022, 1:58 PM

Apollo lets u do this

Frank

02/18/2022, 4:42 AM

Hey @Marko Bilal, gotcha.. yeah, I haven’t used AppSync enough to know the right solution. sorry for the late follow up.

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