Error: interface {} is string, not *string

[Sytten]

What happened?

It seems that in the following schema:

type Account {
    roles: [Role!]!
}

type Role {
    role: String!
}

If the model role is mapped to:

type Role struct {
	AccountID      uuid.UUID `sql:"primary_key"`
	Role           string
}

It will fail to serialize because it assumes that the string is a pointer (res := resTmp.(*string)):

func (ec *executionContext) _Role_role(ctx context.Context, field graphql.CollectedField, obj *model.Role) (ret graphql.Marshaler) {
	defer func() {
		if r := recover(); r != nil {
			ec.Error(ctx, ec.Recover(ctx, r))
			ret = graphql.Null
		}
	}()
	fc := &graphql.FieldContext{
		Object:     "Role",
		Field:      field,
		Args:       nil,
		IsMethod:   false,
		IsResolver: false,
	}

	ctx = graphql.WithFieldContext(ctx, fc)
	resTmp, err := ec.ResolverMiddleware(ctx, func(rctx context.Context) (interface{}, error) {
		ctx = rctx // use context from middleware stack in children
		return obj.Role, nil
	})
	if err != nil {
		ec.Error(ctx, err)
		return graphql.Null
	}
	if resTmp == nil {
		if !graphql.HasFieldError(ctx, fc) {
			ec.Errorf(ctx, "must not be null")
		}
		return graphql.Null
	}
	res := resTmp.(*string)
	fc.Result = res
	return ec.marshalNString2ᚖstring(ctx, field.Selections, res)
}

What did you expect?

I expected to be able to return string and it works or something in the doc to explain how I should make it work.

Minimal graphql.schema and models to reproduce

See above

versions

• gqlgen version 0.13.0
• go version 1.15
• go modules

[Sytten]

It seems to work if I add this to my models:

models:
  String:
    model:
      - github.com/99designs/gqlgen/graphql.String