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Adding extra fields to errors #109

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@F21

Description

Let's say I have a graphql schema with a field that looks like this:

fields := graphql.Fields{
        "hello": &graphql.Field{
            Type: graphql.String,
            Resolve: func(p graphql.ResolveParams) (interface{}, error) {
                return nil, errors.New("Whoops! An error occurred")
            },
        },
    }

The result would be:

{
  "data": {
    "test": {
      "id": null,
    }
  },
  "errors": [
    {
      "message": "Whoops! An error occurred",
      "locations": [
      ]
    }
  ]
}

What I would like to do is to be able to add extra fields to the errors object. For example:

{
  "data": {
    "test": {
      "id": null,
    }
  },
  "errors": [
    {
      "message": "Whoops! An error occurred",
      "locations": [
      ],
      "field": "hello",
      "code": "WHOOPS_ERROR"
    }
  ]
}

It would be really cool if there's way to be able to add these extra fields into the error message when an error happens.

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