Interface in result type

[mafalt]

Hi all,

I want to use typed errors in mutations. For this I have an Error interface defined in schema and some error types implementing such interface:

interface Error {
  message: String!
}

type SaveError implements Error {
  message: String!
}

Result type and mutation defined as:

type UserResult implements Result {
  user: User
  errors: [Error!]
}

type Mutation {
  updateUser(input: UpdateUserInput!): UserResult!
}

This generates this Go code:

type Error interface {
	IsError()
	GetMessage() string
}

type SaveError struct {
	Message string `json:"message"`
}

func (SaveError) IsError()                {}

func (this SaveError) GetMessage() string { return this.Message }

When I write an integration test using client package I use this structure to store the result:

var resp struct {
	UpdateUser struct {
		User *struct {
			ID                     string `json:"id"`
			LoginName              string `json:"loginName"`
			PasswordChangeRequired bool   `json:"passwordChangeRequired"`
			IsLocked               bool   `json:"isLocked"`
		}
		Errors []model.Error `json:"errors"`
	}
}

The test failes with errors:

'UpdateUser.errors[0]' expected type 'model.Error', got 'map[string]interface {}'
'UpdateUser.errors[1]' expected type 'model.Error', got 'map[string]interface {}'

Regular GraphQL request works fine and the result is as expected - this is only in tests.

Any idea what I have wrond here?

Thank you in advance.

[mafalt]

Finally I've found solution. The point is that I forgot to specify JSON field name for UpdateUser struct. With this everything' working:

var resp struct {
	UpdateUser struct {
		User *struct {
			ID                     string `json:"id"`
			LoginName              string `json:"loginName"`
			PasswordChangeRequired bool   `json:"passwordChangeRequired"`
			IsLocked               bool   `json:"isLocked"`
		}
		Errors []model.Error `json:"errors"`
	} `json:"updateUser"`
}