genqlient/generate/testdata/snapshots/TestGenerate-CovariantInterfaceImplementation.graphql-CovariantInterfaceImplementation.graphql.go

// Code generated by github.com/Khan/genqlient, DO NOT EDIT.

package test

import (
	"encoding/json"
	"fmt"

	"github.com/Khan/genqlient/graphql"
	"github.com/Khan/genqlient/internal/testutil"
)

// ContentFields includes the GraphQL fields of Content requested by the fragment ContentFields.
// The GraphQL type's documentation follows.
//
// Content is implemented by various types like Article, Video, and Topic.
//
// ContentFields is implemented by the following types:
// ContentFieldsArticle
// ContentFieldsTopic
// ContentFieldsVideo
type ContentFields interface {
	implementsGraphQLInterfaceContentFields()
	// GetNext returns the interface-field "next" from its implementation.
	GetNext() ContentFieldsNextContent
	// GetRelated returns the interface-field "related" from its implementation.
	GetRelated() []ContentFieldsRelatedContent
}

func (v *ContentFieldsArticle) implementsGraphQLInterfaceContentFields() {}
func (v *ContentFieldsTopic) implementsGraphQLInterfaceContentFields()   {}
func (v *ContentFieldsVideo) implementsGraphQLInterfaceContentFields()   {}

func __unmarshalContentFields(b []byte, v *ContentFields) error {
	if string(b) == "null" {
		return nil
	}

	var tn struct {
		TypeName string `json:"__typename"`
	}
	err := json.Unmarshal(b, &tn)
	if err != nil {
		return err
	}

	switch tn.TypeName {
	case "Article":
		*v = new(ContentFieldsArticle)
		return json.Unmarshal(b, *v)
	case "Topic":
		*v = new(ContentFieldsTopic)
		return json.Unmarshal(b, *v)
	case "Video":
		*v = new(ContentFieldsVideo)
		return json.Unmarshal(b, *v)
	case "":
		return fmt.Errorf(
			"response was missing Content.__typename")
	default:
		return fmt.Errorf(
			`unexpected concrete type for ContentFields: "%v"`, tn.TypeName)
	}
}

func __marshalContentFields(v *ContentFields) ([]byte, error) {

	var typename string
	switch v := (*v).(type) {
	case *ContentFieldsArticle:
		typename = "Article"

		premarshaled, err := v.__premarshalJSON()
		if err != nil {
			return nil, err
		}
		result := struct {
			TypeName string `json:"__typename"`
			*__premarshalContentFieldsArticle
		}{typename, premarshaled}
		return json.Marshal(result)
	case *ContentFieldsTopic:
		typename = "Topic"

		premarshaled, err := v.__premarshalJSON()
		if err != nil {
			return nil, err
		}
		result := struct {
			TypeName string `json:"__typename"`
			*__premarshalContentFieldsTopic
		}{typename, premarshaled}
		return json.Marshal(result)
	case *ContentFieldsVideo:
		typename = "Video"

		premarshaled, err := v.__premarshalJSON()
		if err != nil {
			return nil, err
		}
		result := struct {
			TypeName string `json:"__typename"`
			*__premarshalContentFieldsVideo
		}{typename, premarshaled}
		return json.Marshal(result)
	case nil:
		return []byte("null"), nil
	default:
		return nil, fmt.Errorf(
			`unexpected concrete type for ContentFields: "%T"`, v)
	}
}

// ContentFields includes the GraphQL fields of Article requested by the fragment ContentFields.
// The GraphQL type's documentation follows.
//
// Content is implemented by various types like Article, Video, and Topic.
type ContentFieldsArticle struct {
	Next    ContentFieldsNextContent      `json:"-"`
	Related []ContentFieldsRelatedContent `json:"-"`
}

// GetNext returns ContentFieldsArticle.Next, and is useful for accessing the field via an interface.
func (v *ContentFieldsArticle) GetNext() ContentFieldsNextContent { return v.Next }

// GetRelated returns ContentFieldsArticle.Related, and is useful for accessing the field via an interface.
func (v *ContentFieldsArticle) GetRelated() []ContentFieldsRelatedContent { return v.Related }

func (v *ContentFieldsArticle) UnmarshalJSON(b []byte) error {

	if string(b) == "null" {
		return nil
	}

	var firstPass struct {
		*ContentFieldsArticle
		Next    json.RawMessage   `json:"next"`
		Related []json.RawMessage `json:"related"`
		graphql.NoUnmarshalJSON
	}
	firstPass.ContentFieldsArticle = v

	err := json.Unmarshal(b, &firstPass)
	if err != nil {
		return err
	}

	{
		dst := &v.Next
		src := firstPass.Next
		if len(src) != 0 && string(src) != "null" {
			err = __unmarshalContentFieldsNextContent(
				src, dst)
			if err != nil {
				return fmt.Errorf(
					"unable to unmarshal ContentFieldsArticle.Next: %w", err)
			}
		}
	}

	{
		dst := &v.Related
		src := firstPass.Related
		*dst = make(
			[]ContentFieldsRelatedContent,
			len(src))
		for i, src := range src {
			dst := &(*dst)[i]
			if len(src) != 0 && string(src) != "null" {
				err = __unmarshalContentFieldsRelatedContent(
					src, dst)
				if err != nil {
					return fmt.Errorf(
						"unable to unmarshal ContentFieldsArticle.Related: %w", err)
				}
			}
		}
	}
	return nil
}

type __premarshalContentFieldsArticle struct {
	Next json.RawMessage `json:"next"`

	Related []json.RawMessage `json:"related"`
}

func (v *ContentFieldsArticle) MarshalJSON() ([]byte, error) {
	premarshaled, err := v.__premarshalJSON()
	if err != nil {
		return nil, err
	}
	return json.Marshal(premarshaled)
}

func (v *ContentFieldsArticle) __premarshalJSON() (*__premarshalContentFieldsArticle, error) {
	var retval __premarshalContentFieldsArticle

	{

		dst := &retval.Next
		src := v.Next
		var err error
		*dst, err = __marshalContentFieldsNextContent(
			&src)
		if err != nil {
			return nil, fmt.Errorf(
				"unable to marshal ContentFieldsArticle.Next: %w", err)
		}
	}
	{

		dst := &retval.Related
		src := v.Related
		*dst = make(
			[]json.RawMessage,
			len(src))
		for i, src := range src {
			dst := &(*dst)[i]
			var err error
			*dst, err = __marshalContentFieldsRelatedContent(
				&src)
			if err != nil {
				return nil, fmt.Errorf(
					"unable to marshal ContentFieldsArticle.Related: %w", err)
			}
		}
	}
	return &retval, nil
}

// ContentFieldsNextArticle includes the requested fields of the GraphQL type Article.
type ContentFieldsNextArticle struct {
	Typename string `json:"__typename"`
	// ID is the identifier of the content.
	Id testutil.ID `json:"id"`
}

// GetTypename returns ContentFieldsNextArticle.Typename, and is useful for accessing the field via an interface.
func (v *ContentFieldsNextArticle) GetTypename() string { return v.Typename }

// GetId returns ContentFieldsNextArticle.Id, and is useful for accessing the field via an interface.
func (v *ContentFieldsNextArticle) GetId() testutil.ID { return v.Id }

// ContentFieldsNextContent includes the requested fields of the GraphQL interface Content.
//
// ContentFieldsNextContent is implemented by the following types:
// ContentFieldsNextArticle
// ContentFieldsNextTopic
// ContentFieldsNextVideo
// The GraphQL type's documentation follows.
//
// Content is implemented by various types like Article, Video, and Topic.
type ContentFieldsNextContent interface {
	implementsGraphQLInterfaceContentFieldsNextContent()
	// GetTypename returns the receiver's concrete GraphQL type-name (see interface doc for possible values).
	GetTypename() string
	// GetId returns the interface-field "id" from its implementation.
	// The GraphQL interface field's documentation follows.
	//
	// ID is the identifier of the content.
	GetId() testutil.ID
}

func (v *ContentFieldsNextArticle) implementsGraphQLInterfaceContentFieldsNextContent() {}
func (v *ContentFieldsNextTopic) implementsGraphQLInterfaceContentFieldsNextContent()   {}
func (v *ContentFieldsNextVideo) implementsGraphQLInterfaceContentFieldsNextContent()   {}

func __unmarshalContentFieldsNextContent(b []byte, v *ContentFieldsNextContent) error {
	if string(b) == "null" {
		return nil
	}

	var tn struct {
		TypeName string `json:"__typename"`
	}
	err := json.Unmarshal(b, &tn)
	if err != nil {
		return err
	}

	switch tn.TypeName {
	case "Article":
		*v = new(ContentFieldsNextArticle)
		return json.Unmarshal(b, *v)
	case "Topic":
		*v = new(ContentFieldsNextTopic)
		return json.Unmarshal(b, *v)
	case "Video":
		*v = new(ContentFieldsNextVideo)
		return json.Unmarshal(b, *v)
	case "":
		return fmt.Errorf(
			"response was missing Content.__typename")
	default:
		return fmt.Errorf(
			`unexpected concrete type for ContentFieldsNextContent: "%v"`, tn.TypeName)
	}
}

func __marshalContentFieldsNextContent(v *ContentFieldsNextContent) ([]byte, error) {

	var typename string
	switch v := (*v).(type) {
	case *ContentFieldsNextArticle:
		typename = "Article"

		result := struct {
			TypeName string `json:"__typename"`
			*ContentFieldsNextArticle
		}{typename, v}
		return json.Marshal(result)
	case *ContentFieldsNextTopic:
		typename = "Topic"

		result := struct {
			TypeName string `json:"__typename"`
			*ContentFieldsNextTopic
		}{typename, v}
		return json.Marshal(result)
	case *ContentFieldsNextVideo:
		typename = "Video"

		result := struct {
			TypeName string `json:"__typename"`
			*ContentFieldsNextVideo
		}{typename, v}
		return json.Marshal(result)
	case nil:
		return []byte("null"), nil
	default:
		return nil, fmt.Errorf(
			`unexpected concrete type for ContentFieldsNextContent: "%T"`, v)
	}
}

// ContentFieldsNextTopic includes the requested fields of the GraphQL type Topic.
type ContentFieldsNextTopic struct {
	Typename string `json:"__typename"`
	// ID is the identifier of the content.
	Id testutil.ID `json:"id"`
}

// GetTypename returns ContentFieldsNextTopic.Typename, and is useful for accessing the field via an interface.
func (v *ContentFieldsNextTopic) GetTypename() string { return v.Typename }

// GetId returns ContentFieldsNextTopic.Id, and is useful for accessing the field via an interface.
func (v *ContentFieldsNextTopic) GetId() testutil.ID { return v.Id }

// ContentFieldsNextVideo includes the requested fields of the GraphQL type Video.
type ContentFieldsNextVideo struct {
	Typename string `json:"__typename"`
	// ID is the identifier of the content.
	Id testutil.ID `json:"id"`
}

// GetTypename returns ContentFieldsNextVideo.Typename, and is useful for accessing the field via an interface.
func (v *ContentFieldsNextVideo) GetTypename() string { return v.Typename }

// GetId returns ContentFieldsNextVideo.Id, and is useful for accessing the field via an interface.
func (v *ContentFieldsNextVideo) GetId() testutil.ID { return v.Id }

// ContentFieldsRelatedArticle includes the requested fields of the GraphQL type Article.
type ContentFieldsRelatedArticle struct {
	Typename string `json:"__typename"`
	// ID is the identifier of the content.
	Id testutil.ID `json:"id"`
}

// GetTypename returns ContentFieldsRelatedArticle.Typename, and is useful for accessing the field via an interface.
func (v *ContentFieldsRelatedArticle) GetTypename() string { return v.Typename }

// GetId returns ContentFieldsRelatedArticle.Id, and is useful for accessing the field via an interface.
func (v *ContentFieldsRelatedArticle) GetId() testutil.ID { return v.Id }

// ContentFieldsRelatedContent includes the requested fields of the GraphQL interface Content.
//
// ContentFieldsRelatedContent is implemented by the following types:
// ContentFieldsRelatedArticle
// ContentFieldsRelatedTopic
// ContentFieldsRelatedVideo
// The GraphQL type's documentation follows.
//
// Content is implemented by various types like Article, Video, and Topic.
type ContentFieldsRelatedContent interface {
	implementsGraphQLInterfaceContentFieldsRelatedContent()
	// GetTypename returns the receiver's concrete GraphQL type-name (see interface doc for possible values).
	GetTypename() string
	// GetId returns the interface-field "id" from its implementation.
	// The GraphQL interface field's documentation follows.
	//
	// ID is the identifier of the content.
	GetId() testutil.ID
}

func (v *ContentFieldsRelatedArticle) implementsGraphQLInterfaceContentFieldsRelatedContent() {}
func (v *ContentFieldsRelatedTopic) implementsGraphQLInterfaceContentFieldsRelatedContent()   {}
func (v *ContentFieldsRelatedVideo) implementsGraphQLInterfaceContentFieldsRelatedContent()   {}

func __unmarshalContentFieldsRelatedContent(b []byte, v *ContentFieldsRelatedContent) error {
	if string(b) == "null" {
		return nil
	}

	var tn struct {
		TypeName string `json:"__typename"`
	}
	err := json.Unmarshal(b, &tn)
	if err != nil {
		return err
	}

	switch tn.TypeName {
	case "Article":
		*v = new(ContentFieldsRelatedArticle)
		return json.Unmarshal(b, *v)
	case "Topic":
		*v = new(ContentFieldsRelatedTopic)
		return json.Unmarshal(b, *v)
	case "Video":
		*v = new(ContentFieldsRelatedVideo)
		return json.Unmarshal(b, *v)
	case "":
		return fmt.Errorf(
			"response was missing Content.__typename")
	default:
		return fmt.Errorf(
			`unexpected concrete type for ContentFieldsRelatedContent: "%v"`, tn.TypeName)
	}
}

func __marshalContentFieldsRelatedContent(v *ContentFieldsRelatedContent) ([]byte, error) {

	var typename string
	switch v := (*v).(type) {
	case *ContentFieldsRelatedArticle:
		typename = "Article"

		result := struct {
			TypeName string `json:"__typename"`
			*ContentFieldsRelatedArticle
		}{typename, v}
		return json.Marshal(result)
	case *ContentFieldsRelatedTopic:
		typename = "Topic"

		result := struct {
			TypeName string `json:"__typename"`
			*ContentFieldsRelatedTopic
		}{typename, v}
		return json.Marshal(result)
	case *ContentFieldsRelatedVideo:
		typename = "Video"

		result := struct {
			TypeName string `json:"__typename"`
			*ContentFieldsRelatedVideo
		}{typename, v}
		return json.Marshal(result)
	case nil:
		return []byte("null"), nil
	default:
		return nil, fmt.Errorf(
			`unexpected concrete type for ContentFieldsRelatedContent: "%T"`, v)
	}
}

// ContentFieldsRelatedTopic includes the requested fields of the GraphQL type Topic.
type ContentFieldsRelatedTopic struct {
	Typename string `json:"__typename"`
	// ID is the identifier of the content.
	Id testutil.ID `json:"id"`
}

// GetTypename returns ContentFieldsRelatedTopic.Typename, and is useful for accessing the field via an interface.
func (v *ContentFieldsRelatedTopic) GetTypename() string { return v.Typename }

// GetId returns ContentFieldsRelatedTopic.Id, and is useful for accessing the field via an interface.
func (v *ContentFieldsRelatedTopic) GetId() testutil.ID { return v.Id }

// ContentFieldsRelatedVideo includes the requested fields of the GraphQL type Video.
type ContentFieldsRelatedVideo struct {
	Typename string `json:"__typename"`
	// ID is the identifier of the content.
	Id testutil.ID `json:"id"`
}

// GetTypename returns ContentFieldsRelatedVideo.Typename, and is useful for accessing the field via an interface.
func (v *ContentFieldsRelatedVideo) GetTypename() string { return v.Typename }

// GetId returns ContentFieldsRelatedVideo.Id, and is useful for accessing the field via an interface.
func (v *ContentFieldsRelatedVideo) GetId() testutil.ID { return v.Id }

// ContentFields includes the GraphQL fields of Topic requested by the fragment ContentFields.
// The GraphQL type's documentation follows.
//
// Content is implemented by various types like Article, Video, and Topic.
type ContentFieldsTopic struct {
	Next    ContentFieldsNextContent      `json:"-"`
	Related []ContentFieldsRelatedContent `json:"-"`
}

// GetNext returns ContentFieldsTopic.Next, and is useful for accessing the field via an interface.
func (v *ContentFieldsTopic) GetNext() ContentFieldsNextContent { return v.Next }

// GetRelated returns ContentFieldsTopic.Related, and is useful for accessing the field via an interface.
func (v *ContentFieldsTopic) GetRelated() []ContentFieldsRelatedContent { return v.Related }

func (v *ContentFieldsTopic) UnmarshalJSON(b []byte) error {

	if string(b) == "null" {
		return nil
	}

	var firstPass struct {
		*ContentFieldsTopic
		Next    json.RawMessage   `json:"next"`
		Related []json.RawMessage `json:"related"`
		graphql.NoUnmarshalJSON
	}
	firstPass.ContentFieldsTopic = v

	err := json.Unmarshal(b, &firstPass)
	if err != nil {
		return err
	}

	{
		dst := &v.Next
		src := firstPass.Next
		if len(src) != 0 && string(src) != "null" {
			err = __unmarshalContentFieldsNextContent(
				src, dst)
			if err != nil {
				return fmt.Errorf(
					"unable to unmarshal ContentFieldsTopic.Next: %w", err)
			}
		}
	}

	{
		dst := &v.Related
		src := firstPass.Related
		*dst = make(
			[]ContentFieldsRelatedContent,
			len(src))
		for i, src := range src {
			dst := &(*dst)[i]
			if len(src) != 0 && string(src) != "null" {
				err = __unmarshalContentFieldsRelatedContent(
					src, dst)
				if err != nil {
					return fmt.Errorf(
						"unable to unmarshal ContentFieldsTopic.Related: %w", err)
				}
			}
		}
	}
	return nil
}

type __premarshalContentFieldsTopic struct {
	Next json.RawMessage `json:"next"`

	Related []json.RawMessage `json:"related"`
}

func (v *ContentFieldsTopic) MarshalJSON() ([]byte, error) {
	premarshaled, err := v.__premarshalJSON()
	if err != nil {
		return nil, err
	}
	return json.Marshal(premarshaled)
}

func (v *ContentFieldsTopic) __premarshalJSON() (*__premarshalContentFieldsTopic, error) {
	var retval __premarshalContentFieldsTopic

	{

		dst := &retval.Next
		src := v.Next
		var err error
		*dst, err = __marshalContentFieldsNextContent(
			&src)
		if err != nil {
			return nil, fmt.Errorf(
				"unable to marshal ContentFieldsTopic.Next: %w", err)
		}
	}
	{

		dst := &retval.Related
		src := v.Related
		*dst = make(
			[]json.RawMessage,
			len(src))
		for i, src := range src {
			dst := &(*dst)[i]
			var err error
			*dst, err = __marshalContentFieldsRelatedContent(
				&src)
			if err != nil {
				return nil, fmt.Errorf(
					"unable to marshal ContentFieldsTopic.Related: %w", err)
			}
		}
	}
	return &retval, nil
}

// ContentFields includes the GraphQL fields of Video requested by the fragment ContentFields.
// The GraphQL type's documentation follows.
//
// Content is implemented by various types like Article, Video, and Topic.
type ContentFieldsVideo struct {
	Next    ContentFieldsNextContent      `json:"-"`
	Related []ContentFieldsRelatedContent `json:"-"`
}

// GetNext returns ContentFieldsVideo.Next, and is useful for accessing the field via an interface.
func (v *ContentFieldsVideo) GetNext() ContentFieldsNextContent { return v.Next }

// GetRelated returns ContentFieldsVideo.Related, and is useful for accessing the field via an interface.
func (v *ContentFieldsVideo) GetRelated() []ContentFieldsRelatedContent { return v.Related }

func (v *ContentFieldsVideo) UnmarshalJSON(b []byte) error {

	if string(b) == "null" {
		return nil
	}

	var firstPass struct {
		*ContentFieldsVideo
		Next    json.RawMessage   `json:"next"`
		Related []json.RawMessage `json:"related"`
		graphql.NoUnmarshalJSON
	}
	firstPass.ContentFieldsVideo = v

	err := json.Unmarshal(b, &firstPass)
	if err != nil {
		return err
	}

	{
		dst := &v.Next
		src := firstPass.Next
		if len(src) != 0 && string(src) != "null" {
			err = __unmarshalContentFieldsNextContent(
				src, dst)
			if err != nil {
				return fmt.Errorf(
					"unable to unmarshal ContentFieldsVideo.Next: %w", err)
			}
		}
	}

	{
		dst := &v.Related
		src := firstPass.Related
		*dst = make(
			[]ContentFieldsRelatedContent,
			len(src))
		for i, src := range src {
			dst := &(*dst)[i]
			if len(src) != 0 && string(src) != "null" {
				err = __unmarshalContentFieldsRelatedContent(
					src, dst)
				if err != nil {
					return fmt.Errorf(
						"unable to unmarshal ContentFieldsVideo.Related: %w", err)
				}
			}
		}
	}
	return nil
}

type __premarshalContentFieldsVideo struct {
	Next json.RawMessage `json:"next"`

	Related []json.RawMessage `json:"related"`
}

func (v *ContentFieldsVideo) MarshalJSON() ([]byte, error) {
	premarshaled, err := v.__premarshalJSON()
	if err != nil {
		return nil, err
	}
	return json.Marshal(premarshaled)
}

func (v *ContentFieldsVideo) __premarshalJSON() (*__premarshalContentFieldsVideo, error) {
	var retval __premarshalContentFieldsVideo

	{

		dst := &retval.Next
		src := v.Next
		var err error
		*dst, err = __marshalContentFieldsNextContent(
			&src)
		if err != nil {
			return nil, fmt.Errorf(
				"unable to marshal ContentFieldsVideo.Next: %w", err)
		}
	}
	{

		dst := &retval.Related
		src := v.Related
		*dst = make(
			[]json.RawMessage,
			len(src))
		for i, src := range src {
			dst := &(*dst)[i]
			var err error
			*dst, err = __marshalContentFieldsRelatedContent(
				&src)
			if err != nil {
				return nil, fmt.Errorf(
					"unable to marshal ContentFieldsVideo.Related: %w", err)
			}
		}
	}
	return &retval, nil
}

// CovariantInterfaceImplementationRandomItemArticle includes the requested fields of the GraphQL type Article.
type CovariantInterfaceImplementationRandomItemArticle struct {
	Typename string `json:"__typename"`
	// ID is the identifier of the content.
	Id      testutil.ID                                                       `json:"id"`
	Next    CovariantInterfaceImplementationRandomItemContentNextContent      `json:"-"`
	Related []CovariantInterfaceImplementationRandomItemContentRelatedContent `json:"-"`
}

// GetTypename returns CovariantInterfaceImplementationRandomItemArticle.Typename, and is useful for accessing the field via an interface.
func (v *CovariantInterfaceImplementationRandomItemArticle) GetTypename() string { return v.Typename }

// GetId returns CovariantInterfaceImplementationRandomItemArticle.Id, and is useful for accessing the field via an interface.
func (v *CovariantInterfaceImplementationRandomItemArticle) GetId() testutil.ID { return v.Id }

// GetNext returns CovariantInterfaceImplementationRandomItemArticle.Next, and is useful for accessing the field via an interface.
func (v *CovariantInterfaceImplementationRandomItemArticle) GetNext() CovariantInterfaceImplementationRandomItemContentNextContent {
	return v.Next
}

// GetRelated returns CovariantInterfaceImplementationRandomItemArticle.Related, and is useful for accessing the field via an interface.
func (v *CovariantInterfaceImplementationRandomItemArticle) GetRelated() []CovariantInterfaceImplementationRandomItemContentRelatedContent {
	return v.Related
}

func (v *CovariantInterfaceImplementationRandomItemArticle) UnmarshalJSON(b []byte) error {

	if string(b) == "null" {
		return nil
	}

	var firstPass struct {
		*CovariantInterfaceImplementationRandomItemArticle
		Next    json.RawMessage   `json:"next"`
		Related []json.RawMessage `json:"related"`
		graphql.NoUnmarshalJSON
	}
	firstPass.CovariantInterfaceImplementationRandomItemArticle = v

	err := json.Unmarshal(b, &firstPass)
	if err != nil {
		return err
	}

	{
		dst := &v.Next
		src := firstPass.Next
		if len(src) != 0 && string(src) != "null" {
			err = __unmarshalCovariantInterfaceImplementationRandomItemContentNextContent(
				src, dst)
			if err != nil {
				return fmt.Errorf(
					"unable to unmarshal CovariantInterfaceImplementationRandomItemArticle.Next: %w", err)
			}
		}
	}

	{
		dst := &v.Related
		src := firstPass.Related
		*dst = make(
			[]CovariantInterfaceImplementationRandomItemContentRelatedContent,
			len(src))
		for i, src := range src {
			dst := &(*dst)[i]
			if len(src) != 0 && string(src) != "null" {
				err = __unmarshalCovariantInterfaceImplementationRandomItemContentRelatedContent(
					src, dst)
				if err != nil {
					return fmt.Errorf(
						"unable to unmarshal CovariantInterfaceImplementationRandomItemArticle.Related: %w", err)
				}
			}
		}
	}
	return nil
}

type __premarshalCovariantInterfaceImplementationRandomItemArticle struct {
	Typename string `json:"__typename"`

	Id testutil.ID `json:"id"`

	Next json.RawMessage `json:"next"`

	Related []json.RawMessage `json:"related"`
}

func (v *CovariantInterfaceImplementationRandomItemArticle) MarshalJSON() ([]byte, error) {
	premarshaled, err := v.__premarshalJSON()
	if err != nil {
		return nil, err
	}
	return json.Marshal(premarshaled)
}

func (v *CovariantInterfaceImplementationRandomItemArticle) __premarshalJSON() (*__premarshalCovariantInterfaceImplementationRandomItemArticle, error) {
	var retval __premarshalCovariantInterfaceImplementationRandomItemArticle

	retval.Typename = v.Typename
	retval.Id = v.Id
	{

		dst := &retval.Next
		src := v.Next
		var err error
		*dst, err = __marshalCovariantInterfaceImplementationRandomItemContentNextContent(
			&src)
		if err != nil {
			return nil, fmt.Errorf(
				"unable to marshal CovariantInterfaceImplementationRandomItemArticle.Next: %w", err)
		}
	}
	{

		dst := &retval.Related
		src := v.Related
		*dst = make(
			[]json.RawMessage,
			len(src))
		for i, src := range src {
			dst := &(*dst)[i]
			var err error
			*dst, err = __marshalCovariantInterfaceImplementationRandomItemContentRelatedContent(
				&src)
			if err != nil {
				return nil, fmt.Errorf(
					"unable to marshal CovariantInterfaceImplementationRandomItemArticle.Related: %w", err)
			}
		}
	}
	return &retval, nil
}

// CovariantInterfaceImplementationRandomItemContent includes the requested fields of the GraphQL interface Content.
//
// CovariantInterfaceImplementationRandomItemContent is implemented by the following types:
// CovariantInterfaceImplementationRandomItemArticle
// CovariantInterfaceImplementationRandomItemTopic
// CovariantInterfaceImplementationRandomItemVideo
// The GraphQL type's documentation follows.
//
// Content is implemented by various types like Article, Video, and Topic.
type CovariantInterfaceImplementationRandomItemContent interface {
	implementsGraphQLInterfaceCovariantInterfaceImplementationRandomItemContent()
	// GetTypename returns the receiver's concrete GraphQL type-name (see interface doc for possible values).
	GetTypename() string
	// GetId returns the interface-field "id" from its implementation.
	// The GraphQL interface field's documentation follows.
	//
	// ID is the identifier of the content.
	GetId() testutil.ID
	// GetNext returns the interface-field "next" from its implementation.
	GetNext() CovariantInterfaceImplementationRandomItemContentNextContent
	// GetRelated returns the interface-field "related" from its implementation.
	GetRelated() []CovariantInterfaceImplementationRandomItemContentRelatedContent
}

func (v *CovariantInterfaceImplementationRandomItemArticle) implementsGraphQLInterfaceCovariantInterfaceImplementationRandomItemContent() {
}
func (v *CovariantInterfaceImplementationRandomItemTopic) implementsGraphQLInterfaceCovariantInterfaceImplementationRandomItemContent() {
}
func (v *CovariantInterfaceImplementationRandomItemVideo) implementsGraphQLInterfaceCovariantInterfaceImplementationRandomItemContent() {
}

func __unmarshalCovariantInterfaceImplementationRandomItemContent(b []byte, v *CovariantInterfaceImplementationRandomItemContent) error {
	if string(b) == "null" {
		return nil
	}

	var tn struct {
		TypeName string `json:"__typename"`
	}
	err := json.Unmarshal(b, &tn)
	if err != nil {
		return err
	}

	switch tn.TypeName {
	case "Article":
		*v = new(CovariantInterfaceImplementationRandomItemArticle)
		return json.Unmarshal(b, *v)
	case "Topic":
		*v = new(CovariantInterfaceImplementationRandomItemTopic)
		return json.Unmarshal(b, *v)
	case "Video":
		*v = new(CovariantInterfaceImplementationRandomItemVideo)
		return json.Unmarshal(b, *v)
	case "":
		return fmt.Errorf(
			"response was missing Content.__typename")
	default:
		return fmt.Errorf(
			`unexpected concrete type for CovariantInterfaceImplementationRandomItemContent: "%v"`, tn.TypeName)
	}
}

func __marshalCovariantInterfaceImplementationRandomItemContent(v *CovariantInterfaceImplementationRandomItemContent) ([]byte, error) {

	var typename string
	switch v := (*v).(type) {
	case *CovariantInterfaceImplementationRandomItemArticle:
		typename = "Article"

		premarshaled, err := v.__premarshalJSON()
		if err != nil {
			return nil, err
		}
		result := struct {
			TypeName string `json:"__typename"`
			*__premarshalCovariantInterfaceImplementationRandomItemArticle
		}{typename, premarshaled}
		return json.Marshal(result)
	case *CovariantInterfaceImplementationRandomItemTopic:
		typename = "Topic"

		premarshaled, err := v.__premarshalJSON()
		if err != nil {
			return nil, err
		}
		result := struct {
			TypeName string `json:"__typename"`
			*__premarshalCovariantInterfaceImplementationRandomItemTopic
		}{typename, premarshaled}
		return json.Marshal(result)
	case *CovariantInterfaceImplementationRandomItemVideo:
		typename = "Video"

		premarshaled, err := v.__premarshalJSON()
		if err != nil {
			return nil, err
		}
		result := struct {
			TypeName string `json:"__typename"`
			*__premarshalCovariantInterfaceImplementationRandomItemVideo
		}{typename, premarshaled}
		return json.Marshal(result)
	case nil:
		return []byte("null"), nil
	default:
		return nil, fmt.Errorf(
			`unexpected concrete type for CovariantInterfaceImplementationRandomItemContent: "%T"`, v)
	}
}

// CovariantInterfaceImplementationRandomItemContentNextArticle includes the requested fields of the GraphQL type Article.
type CovariantInterfaceImplementationRandomItemContentNextArticle struct {
	Typename             string `json:"__typename"`
	ContentFieldsArticle `json:"-"`
}

// GetTypename returns CovariantInterfaceImplementationRandomItemContentNextArticle.Typename, and is useful for accessing the field via an interface.
func (v *CovariantInterfaceImplementationRandomItemContentNextArticle) GetTypename() string {
	return v.Typename
}

// GetNext returns CovariantInterfaceImplementationRandomItemContentNextArticle.Next, and is useful for accessing the field via an interface.
func (v *CovariantInterfaceImplementationRandomItemContentNextArticle) GetNext() ContentFieldsNextContent {
	return v.ContentFieldsArticle.Next
}

// GetRelated returns CovariantInterfaceImplementationRandomItemContentNextArticle.Related, and is useful for accessing the field via an interface.
func (v *CovariantInterfaceImplementationRandomItemContentNextArticle) GetRelated() []ContentFieldsRelatedContent {
	return v.ContentFieldsArticle.Related
}

func (v *CovariantInterfaceImplementationRandomItemContentNextArticle) UnmarshalJSON(b []byte) error {

	if string(b) == "null" {
		return nil
	}

	var firstPass struct {
		*CovariantInterfaceImplementationRandomItemContentNextArticle
		graphql.NoUnmarshalJSON
	}
	firstPass.CovariantInterfaceImplementationRandomItemContentNextArticle = v

	err := json.Unmarshal(b, &firstPass)
	if err != nil {
		return err
	}

	err = json.Unmarshal(
		b, &v.ContentFieldsArticle)
	if err != nil {
		return err
	}
	return nil
}

type __premarshalCovariantInterfaceImplementationRandomItemContentNextArticle struct {
	Typename string `json:"__typename"`

	Next json.RawMessage `json:"next"`

	Related []json.RawMessage `json:"related"`
}

func (v *CovariantInterfaceImplementationRandomItemContentNextArticle) MarshalJSON() ([]byte, error) {
	premarshaled, err := v.__premarshalJSON()
	if err != nil {
		return nil, err
	}
	return json.Marshal(premarshaled)
}

func (v *CovariantInterfaceImplementationRandomItemContentNextArticle) __premarshalJSON() (*__premarshalCovariantInterfaceImplementationRandomItemContentNextArticle, error) {
	var retval __premarshalCovariantInterfaceImplementationRandomItemContentNextArticle

	retval.Typename = v.Typename
	{

		dst := &retval.Next
		src := v.ContentFieldsArticle.Next
		var err error
		*dst, err = __marshalContentFieldsNextContent(
			&src)
		if err != nil {
			return nil, fmt.Errorf(
				"unable to marshal CovariantInterfaceImplementationRandomItemContentNextArticle.ContentFieldsArticle.Next: %w", err)
		}
	}
	{

		dst := &retval.Related
		src := v.ContentFieldsArticle.Related
		*dst = make(
			[]json.RawMessage,
			len(src))
		for i, src := range src {
			dst := &(*dst)[i]
			var err error
			*dst, err = __marshalContentFieldsRelatedContent(
				&src)
			if err != nil {
				return nil, fmt.Errorf(
					"unable to marshal CovariantInterfaceImplementationRandomItemContentNextArticle.ContentFieldsArticle.Related: %w", err)
			}
		}
	}
	return &retval, nil
}

// CovariantInterfaceImplementationRandomItemContentNextContent includes the requested fields of the GraphQL interface Content.
//
// CovariantInterfaceImplementationRandomItemContentNextContent is implemented by the following types:
// CovariantInterfaceImplementationRandomItemContentNextArticle
// CovariantInterfaceImplementationRandomItemContentNextTopic
// CovariantInterfaceImplementationRandomItemContentNextVideo
// The GraphQL type's documentation follows.
//
// Content is implemented by various types like Article, Video, and Topic.
type CovariantInterfaceImplementationRandomItemContentNextContent interface {
	implementsGraphQLInterfaceCovariantInterfaceImplementationRandomItemContentNextContent()
	// GetTypename returns the receiver's concrete GraphQL type-name (see interface doc for possible values).
	GetTypename() string
	ContentFields
}

func (v *CovariantInterfaceImplementationRandomItemContentNextArticle) implementsGraphQLInterfaceCovariantInterfaceImplementationRandomItemContentNextContent() {
}
func (v *CovariantInterfaceImplementationRandomItemContentNextTopic) implementsGraphQLInterfaceCovariantInterfaceImplementationRandomItemContentNextContent() {
}
func (v *CovariantInterfaceImplementationRandomItemContentNextVideo) implementsGraphQLInterfaceCovariantInterfaceImplementationRandomItemContentNextContent() {
}

func __unmarshalCovariantInterfaceImplementationRandomItemContentNextContent(b []byte, v *CovariantInterfaceImplementationRandomItemContentNextContent) error {
	if string(b) == "null" {
		return nil
	}

	var tn struct {
		TypeName string `json:"__typename"`
	}
	err := json.Unmarshal(b, &tn)
	if err != nil {
		return err
	}

	switch tn.TypeName {
	case "Article":
		*v = new(CovariantInterfaceImplementationRandomItemContentNextArticle)
		return json.Unmarshal(b, *v)
	case "Topic":
		*v = new(CovariantInterfaceImplementationRandomItemContentNextTopic)
		return json.Unmarshal(b, *v)
	case "Video":
		*v = new(CovariantInterfaceImplementationRandomItemContentNextVideo)
		return json.Unmarshal(b, *v)
	case "":
		return fmt.Errorf(
			"response was missing Content.__typename")
	default:
		return fmt.Errorf(
			`unexpected concrete type for CovariantInterfaceImplementationRandomItemContentNextContent: "%v"`, tn.TypeName)
	}
}

func __marshalCovariantInterfaceImplementationRandomItemContentNextContent(v *CovariantInterfaceImplementationRandomItemContentNextContent) ([]byte, error) {

	var typename string
	switch v := (*v).(type) {
	case *CovariantInterfaceImplementationRandomItemContentNextArticle:
		typename = "Article"

		premarshaled, err := v.__premarshalJSON()
		if err != nil {
			return nil, err
		}
		result := struct {
			TypeName string `json:"__typename"`
			*__premarshalCovariantInterfaceImplementationRandomItemContentNextArticle
		}{typename, premarshaled}
		return json.Marshal(result)
	case *CovariantInterfaceImplementationRandomItemContentNextTopic:
		typename = "Topic"

		premarshaled, err := v.__premarshalJSON()
		if err != nil {
			return nil, err
		}
		result := struct {
			TypeName string `json:"__typename"`
			*__premarshalCovariantInterfaceImplementationRandomItemContentNextTopic
		}{typename, premarshaled}
		return json.Marshal(result)
	case *CovariantInterfaceImplementationRandomItemContentNextVideo:
		typename = "Video"

		premarshaled, err := v.__premarshalJSON()
		if err != nil {
			return nil, err
		}
		result := struct {
			TypeName string `json:"__typename"`
			*__premarshalCovariantInterfaceImplementationRandomItemContentNextVideo
		}{typename, premarshaled}
		return json.Marshal(result)
	case nil:
		return []byte("null"), nil
	default:
		return nil, fmt.Errorf(
			`unexpected concrete type for CovariantInterfaceImplementationRandomItemContentNextContent: "%T"`, v)
	}
}

// CovariantInterfaceImplementationRandomItemContentNextTopic includes the requested fields of the GraphQL type Topic.
type CovariantInterfaceImplementationRandomItemContentNextTopic struct {
	Typename           string `json:"__typename"`
	ContentFieldsTopic `json:"-"`
}

// GetTypename returns CovariantInterfaceImplementationRandomItemContentNextTopic.Typename, and is useful for accessing the field via an interface.
func (v *CovariantInterfaceImplementationRandomItemContentNextTopic) GetTypename() string {
	return v.Typename
}

// GetNext returns CovariantInterfaceImplementationRandomItemContentNextTopic.Next, and is useful for accessing the field via an interface.
func (v *CovariantInterfaceImplementationRandomItemContentNextTopic) GetNext() ContentFieldsNextContent {
	return v.ContentFieldsTopic.Next
}

// GetRelated returns CovariantInterfaceImplementationRandomItemContentNextTopic.Related, and is useful for accessing the field via an interface.
func (v *CovariantInterfaceImplementationRandomItemContentNextTopic) GetRelated() []ContentFieldsRelatedContent {
	return v.ContentFieldsTopic.Related
}

func (v *CovariantInterfaceImplementationRandomItemContentNextTopic) UnmarshalJSON(b []byte) error {

	if string(b) == "null" {
		return nil
	}

	var firstPass struct {
		*CovariantInterfaceImplementationRandomItemContentNextTopic
		graphql.NoUnmarshalJSON
	}
	firstPass.CovariantInterfaceImplementationRandomItemContentNextTopic = v

	err := json.Unmarshal(b, &firstPass)
	if err != nil {
		return err
	}

	err = json.Unmarshal(
		b, &v.ContentFieldsTopic)
	if err != nil {
		return err
	}
	return nil
}

type __premarshalCovariantInterfaceImplementationRandomItemContentNextTopic struct {
	Typename string `json:"__typename"`

	Next json.RawMessage `json:"next"`

	Related []json.RawMessage `json:"related"`
}

func (v *CovariantInterfaceImplementationRandomItemContentNextTopic) MarshalJSON() ([]byte, error) {
	premarshaled, err := v.__premarshalJSON()
	if err != nil {
		return nil, err
	}
	return json.Marshal(premarshaled)
}

func (v *CovariantInterfaceImplementationRandomItemContentNextTopic) __premarshalJSON() (*__premarshalCovariantInterfaceImplementationRandomItemContentNextTopic, error) {
	var retval __premarshalCovariantInterfaceImplementationRandomItemContentNextTopic

	retval.Typename = v.Typename
	{

		dst := &retval.Next
		src := v.ContentFieldsTopic.Next
		var err error
		*dst, err = __marshalContentFieldsNextContent(
			&src)
		if err != nil {
			return nil, fmt.Errorf(
				"unable to marshal CovariantInterfaceImplementationRandomItemContentNextTopic.ContentFieldsTopic.Next: %w", err)
		}
	}
	{

		dst := &retval.Related
		src := v.ContentFieldsTopic.Related
		*dst = make(
			[]json.RawMessage,
			len(src))
		for i, src := range src {
			dst := &(*dst)[i]
			var err error
			*dst, err = __marshalContentFieldsRelatedContent(
				&src)
			if err != nil {
				return nil, fmt.Errorf(
					"unable to marshal CovariantInterfaceImplementationRandomItemContentNextTopic.ContentFieldsTopic.Related: %w", err)
			}
		}
	}
	return &retval, nil
}

// CovariantInterfaceImplementationRandomItemContentNextVideo includes the requested fields of the GraphQL type Video.
type CovariantInterfaceImplementationRandomItemContentNextVideo struct {
	Typename           string `json:"__typename"`
	ContentFieldsVideo `json:"-"`
}

// GetTypename returns CovariantInterfaceImplementationRandomItemContentNextVideo.Typename, and is useful for accessing the field via an interface.
func (v *CovariantInterfaceImplementationRandomItemContentNextVideo) GetTypename() string {
	return v.Typename
}

// GetNext returns CovariantInterfaceImplementationRandomItemContentNextVideo.Next, and is useful for accessing the field via an interface.
func (v *CovariantInterfaceImplementationRandomItemContentNextVideo) GetNext() ContentFieldsNextContent {
	return v.ContentFieldsVideo.Next
}

// GetRelated returns CovariantInterfaceImplementationRandomItemContentNextVideo.Related, and is useful for accessing the field via an interface.
func (v *CovariantInterfaceImplementationRandomItemContentNextVideo) GetRelated() []ContentFieldsRelatedContent {
	return v.ContentFieldsVideo.Related
}

func (v *CovariantInterfaceImplementationRandomItemContentNextVideo) UnmarshalJSON(b []byte) error {

	if string(b) == "null" {
		return nil
	}

	var firstPass struct {
		*CovariantInterfaceImplementationRandomItemContentNextVideo
		graphql.NoUnmarshalJSON
	}
	firstPass.CovariantInterfaceImplementationRandomItemContentNextVideo = v

	err := json.Unmarshal(b, &firstPass)
	if err != nil {
		return err
	}

	err = json.Unmarshal(
		b, &v.ContentFieldsVideo)
	if err != nil {
		return err
	}
	return nil
}

type __premarshalCovariantInterfaceImplementationRandomItemContentNextVideo struct {
	Typename string `json:"__typename"`

	Next json.RawMessage `json:"next"`

	Related []json.RawMessage `json:"related"`
}

func (v *CovariantInterfaceImplementationRandomItemContentNextVideo) MarshalJSON() ([]byte, error) {
	premarshaled, err := v.__premarshalJSON()
	if err != nil {
		return nil, err
	}
	return json.Marshal(premarshaled)
}

func (v *CovariantInterfaceImplementationRandomItemContentNextVideo) __premarshalJSON() (*__premarshalCovariantInterfaceImplementationRandomItemContentNextVideo, error) {
	var retval __premarshalCovariantInterfaceImplementationRandomItemContentNextVideo

	retval.Typename = v.Typename
	{

		dst := &retval.Next
		src := v.ContentFieldsVideo.Next
		var err error
		*dst, err = __marshalContentFieldsNextContent(
			&src)
		if err != nil {
			return nil, fmt.Errorf(
				"unable to marshal CovariantInterfaceImplementationRandomItemContentNextVideo.ContentFieldsVideo.Next: %w", err)
		}
	}
	{

		dst := &retval.Related
		src := v.ContentFieldsVideo.Related
		*dst = make(
			[]json.RawMessage,
			len(src))
		for i, src := range src {
			dst := &(*dst)[i]
			var err error
			*dst, err = __marshalContentFieldsRelatedContent(
				&src)
			if err != nil {
				return nil, fmt.Errorf(
					"unable to marshal CovariantInterfaceImplementationRandomItemContentNextVideo.ContentFieldsVideo.Related: %w", err)
			}
		}
	}
	return &retval, nil
}

// CovariantInterfaceImplementationRandomItemContentRelatedArticle includes the requested fields of the GraphQL type Article.
type CovariantInterfaceImplementationRandomItemContentRelatedArticle struct {
	Typename             string `json:"__typename"`
	ContentFieldsArticle `json:"-"`
}

// GetTypename returns CovariantInterfaceImplementationRandomItemContentRelatedArticle.Typename, and is useful for accessing the field via an interface.
func (v *CovariantInterfaceImplementationRandomItemContentRelatedArticle) GetTypename() string {
	return v.Typename
}

// GetNext returns CovariantInterfaceImplementationRandomItemContentRelatedArticle.Next, and is useful for accessing the field via an interface.
func (v *CovariantInterfaceImplementationRandomItemContentRelatedArticle) GetNext() ContentFieldsNextContent {
	return v.ContentFieldsArticle.Next
}

// GetRelated returns CovariantInterfaceImplementationRandomItemContentRelatedArticle.Related, and is useful for accessing the field via an interface.
func (v *CovariantInterfaceImplementationRandomItemContentRelatedArticle) GetRelated() []ContentFieldsRelatedContent {
	return v.ContentFieldsArticle.Related
}

func (v *CovariantInterfaceImplementationRandomItemContentRelatedArticle) UnmarshalJSON(b []byte) error {

	if string(b) == "null" {
		return nil
	}

	var firstPass struct {
		*CovariantInterfaceImplementationRandomItemContentRelatedArticle
		graphql.NoUnmarshalJSON
	}
	firstPass.CovariantInterfaceImplementationRandomItemContentRelatedArticle = v

	err := json.Unmarshal(b, &firstPass)
	if err != nil {
		return err
	}

	err = json.Unmarshal(
		b, &v.ContentFieldsArticle)
	if err != nil {
		return err
	}
	return nil
}

type __premarshalCovariantInterfaceImplementationRandomItemContentRelatedArticle struct {
	Typename string `json:"__typename"`

	Next json.RawMessage `json:"next"`

	Related []json.RawMessage `json:"related"`
}

func (v *CovariantInterfaceImplementationRandomItemContentRelatedArticle) MarshalJSON() ([]byte, error) {
	premarshaled, err := v.__premarshalJSON()
	if err != nil {
		return nil, err
	}
	return json.Marshal(premarshaled)
}

func (v *CovariantInterfaceImplementationRandomItemContentRelatedArticle) __premarshalJSON() (*__premarshalCovariantInterfaceImplementationRandomItemContentRelatedArticle, error) {
	var retval __premarshalCovariantInterfaceImplementationRandomItemContentRelatedArticle

	retval.Typename = v.Typename
	{

		dst := &retval.Next
		src := v.ContentFieldsArticle.Next
		var err error
		*dst, err = __marshalContentFieldsNextContent(
			&src)
		if err != nil {
			return nil, fmt.Errorf(
				"unable to marshal CovariantInterfaceImplementationRandomItemContentRelatedArticle.ContentFieldsArticle.Next: %w", err)
		}
	}
	{

		dst := &retval.Related
		src := v.ContentFieldsArticle.Related
		*dst = make(
			[]json.RawMessage,
			len(src))
		for i, src := range src {
			dst := &(*dst)[i]
			var err error
			*dst, err = __marshalContentFieldsRelatedContent(
				&src)
			if err != nil {
				return nil, fmt.Errorf(
					"unable to marshal CovariantInterfaceImplementationRandomItemContentRelatedArticle.ContentFieldsArticle.Related: %w", err)
			}
		}
	}
	return &retval, nil
}

// CovariantInterfaceImplementationRandomItemContentRelatedContent includes the requested fields of the GraphQL interface Content.
//
// CovariantInterfaceImplementationRandomItemContentRelatedContent is implemented by the following types:
// CovariantInterfaceImplementationRandomItemContentRelatedArticle
// CovariantInterfaceImplementationRandomItemContentRelatedTopic
// CovariantInterfaceImplementationRandomItemContentRelatedVideo
// The GraphQL type's documentation follows.
//
// Content is implemented by various types like Article, Video, and Topic.
type CovariantInterfaceImplementationRandomItemContentRelatedContent interface {
	implementsGraphQLInterfaceCovariantInterfaceImplementationRandomItemContentRelatedContent()
	// GetTypename returns the receiver's concrete GraphQL type-name (see interface doc for possible values).
	GetTypename() string
	ContentFields
}

func (v *CovariantInterfaceImplementationRandomItemContentRelatedArticle) implementsGraphQLInterfaceCovariantInterfaceImplementationRandomItemContentRelatedContent() {
}
func (v *CovariantInterfaceImplementationRandomItemContentRelatedTopic) implementsGraphQLInterfaceCovariantInterfaceImplementationRandomItemContentRelatedContent() {
}
func (v *CovariantInterfaceImplementationRandomItemContentRelatedVideo) implementsGraphQLInterfaceCovariantInterfaceImplementationRandomItemContentRelatedContent() {
}

func __unmarshalCovariantInterfaceImplementationRandomItemContentRelatedContent(b []byte, v *CovariantInterfaceImplementationRandomItemContentRelatedContent) error {
	if string(b) == "null" {
		return nil
	}

	var tn struct {
		TypeName string `json:"__typename"`
	}
	err := json.Unmarshal(b, &tn)
	if err != nil {
		return err
	}

	switch tn.TypeName {
	case "Article":
		*v = new(CovariantInterfaceImplementationRandomItemContentRelatedArticle)
		return json.Unmarshal(b, *v)
	case "Topic":
		*v = new(CovariantInterfaceImplementationRandomItemContentRelatedTopic)
		return json.Unmarshal(b, *v)
	case "Video":
		*v = new(CovariantInterfaceImplementationRandomItemContentRelatedVideo)
		return json.Unmarshal(b, *v)
	case "":
		return fmt.Errorf(
			"response was missing Content.__typename")
	default:
		return fmt.Errorf(
			`unexpected concrete type for CovariantInterfaceImplementationRandomItemContentRelatedContent: "%v"`, tn.TypeName)
	}
}

func __marshalCovariantInterfaceImplementationRandomItemContentRelatedContent(v *CovariantInterfaceImplementationRandomItemContentRelatedContent) ([]byte, error) {

	var typename string
	switch v := (*v).(type) {
	case *CovariantInterfaceImplementationRandomItemContentRelatedArticle:
		typename = "Article"

		premarshaled, err := v.__premarshalJSON()
		if err != nil {
			return nil, err
		}
		result := struct {
			TypeName string `json:"__typename"`
			*__premarshalCovariantInterfaceImplementationRandomItemContentRelatedArticle
		}{typename, premarshaled}
		return json.Marshal(result)
	case *CovariantInterfaceImplementationRandomItemContentRelatedTopic:
		typename = "Topic"

		premarshaled, err := v.__premarshalJSON()
		if err != nil {
			return nil, err
		}
		result := struct {
			TypeName string `json:"__typename"`
			*__premarshalCovariantInterfaceImplementationRandomItemContentRelatedTopic
		}{typename, premarshaled}
		return json.Marshal(result)
	case *CovariantInterfaceImplementationRandomItemContentRelatedVideo:
		typename = "Video"

		premarshaled, err := v.__premarshalJSON()
		if err != nil {
			return nil, err
		}
		result := struct {
			TypeName string `json:"__typename"`
			*__premarshalCovariantInterfaceImplementationRandomItemContentRelatedVideo
		}{typename, premarshaled}
		return json.Marshal(result)
	case nil:
		return []byte("null"), nil
	default:
		return nil, fmt.Errorf(
			`unexpected concrete type for CovariantInterfaceImplementationRandomItemContentRelatedContent: "%T"`, v)
	}
}

// CovariantInterfaceImplementationRandomItemContentRelatedTopic includes the requested fields of the GraphQL type Topic.
type CovariantInterfaceImplementationRandomItemContentRelatedTopic struct {
	Typename           string `json:"__typename"`
	ContentFieldsTopic `json:"-"`
}

// GetTypename returns CovariantInterfaceImplementationRandomItemContentRelatedTopic.Typename, and is useful for accessing the field via an interface.
func (v *CovariantInterfaceImplementationRandomItemContentRelatedTopic) GetTypename() string {
	return v.Typename
}

// GetNext returns CovariantInterfaceImplementationRandomItemContentRelatedTopic.Next, and is useful for accessing the field via an interface.
func (v *CovariantInterfaceImplementationRandomItemContentRelatedTopic) GetNext() ContentFieldsNextContent {
	return v.ContentFieldsTopic.Next
}

// GetRelated returns CovariantInterfaceImplementationRandomItemContentRelatedTopic.Related, and is useful for accessing the field via an interface.
func (v *CovariantInterfaceImplementationRandomItemContentRelatedTopic) GetRelated() []ContentFieldsRelatedContent {
	return v.ContentFieldsTopic.Related
}

func (v *CovariantInterfaceImplementationRandomItemContentRelatedTopic) UnmarshalJSON(b []byte) error {

	if string(b) == "null" {
		return nil
	}

	var firstPass struct {
		*CovariantInterfaceImplementationRandomItemContentRelatedTopic
		graphql.NoUnmarshalJSON
	}
	firstPass.CovariantInterfaceImplementationRandomItemContentRelatedTopic = v

	err := json.Unmarshal(b, &firstPass)
	if err != nil {
		return err
	}

	err = json.Unmarshal(
		b, &v.ContentFieldsTopic)
	if err != nil {
		return err
	}
	return nil
}

type __premarshalCovariantInterfaceImplementationRandomItemContentRelatedTopic struct {
	Typename string `json:"__typename"`

	Next json.RawMessage `json:"next"`

	Related []json.RawMessage `json:"related"`
}

func (v *CovariantInterfaceImplementationRandomItemContentRelatedTopic) MarshalJSON() ([]byte, error) {
	premarshaled, err := v.__premarshalJSON()
	if err != nil {
		return nil, err
	}
	return json.Marshal(premarshaled)
}

func (v *CovariantInterfaceImplementationRandomItemContentRelatedTopic) __premarshalJSON() (*__premarshalCovariantInterfaceImplementationRandomItemContentRelatedTopic, error) {
	var retval __premarshalCovariantInterfaceImplementationRandomItemContentRelatedTopic

	retval.Typename = v.Typename
	{

		dst := &retval.Next
		src := v.ContentFieldsTopic.Next
		var err error
		*dst, err = __marshalContentFieldsNextContent(
			&src)
		if err != nil {
			return nil, fmt.Errorf(
				"unable to marshal CovariantInterfaceImplementationRandomItemContentRelatedTopic.ContentFieldsTopic.Next: %w", err)
		}
	}
	{

		dst := &retval.Related
		src := v.ContentFieldsTopic.Related
		*dst = make(
			[]json.RawMessage,
			len(src))
		for i, src := range src {
			dst := &(*dst)[i]
			var err error
			*dst, err = __marshalContentFieldsRelatedContent(
				&src)
			if err != nil {
				return nil, fmt.Errorf(
					"unable to marshal CovariantInterfaceImplementationRandomItemContentRelatedTopic.ContentFieldsTopic.Related: %w", err)
			}
		}
	}
	return &retval, nil
}

// CovariantInterfaceImplementationRandomItemContentRelatedVideo includes the requested fields of the GraphQL type Video.
type CovariantInterfaceImplementationRandomItemContentRelatedVideo struct {
	Typename           string `json:"__typename"`
	ContentFieldsVideo `json:"-"`
}

// GetTypename returns CovariantInterfaceImplementationRandomItemContentRelatedVideo.Typename, and is useful for accessing the field via an interface.
func (v *CovariantInterfaceImplementationRandomItemContentRelatedVideo) GetTypename() string {
	return v.Typename
}

// GetNext returns CovariantInterfaceImplementationRandomItemContentRelatedVideo.Next, and is useful for accessing the field via an interface.
func (v *CovariantInterfaceImplementationRandomItemContentRelatedVideo) GetNext() ContentFieldsNextContent {
	return v.ContentFieldsVideo.Next
}

// GetRelated returns CovariantInterfaceImplementationRandomItemContentRelatedVideo.Related, and is useful for accessing the field via an interface.
func (v *CovariantInterfaceImplementationRandomItemContentRelatedVideo) GetRelated() []ContentFieldsRelatedContent {
	return v.ContentFieldsVideo.Related
}

func (v *CovariantInterfaceImplementationRandomItemContentRelatedVideo) UnmarshalJSON(b []byte) error {

	if string(b) == "null" {
		return nil
	}

	var firstPass struct {
		*CovariantInterfaceImplementationRandomItemContentRelatedVideo
		graphql.NoUnmarshalJSON
	}
	firstPass.CovariantInterfaceImplementationRandomItemContentRelatedVideo = v

	err := json.Unmarshal(b, &firstPass)
	if err != nil {
		return err
	}

	err = json.Unmarshal(
		b, &v.ContentFieldsVideo)
	if err != nil {
		return err
	}
	return nil
}

type __premarshalCovariantInterfaceImplementationRandomItemContentRelatedVideo struct {
	Typename string `json:"__typename"`

	Next json.RawMessage `json:"next"`

	Related []json.RawMessage `json:"related"`
}

func (v *CovariantInterfaceImplementationRandomItemContentRelatedVideo) MarshalJSON() ([]byte, error) {
	premarshaled, err := v.__premarshalJSON()
	if err != nil {
		return nil, err
	}
	return json.Marshal(premarshaled)
}

func (v *CovariantInterfaceImplementationRandomItemContentRelatedVideo) __premarshalJSON() (*__premarshalCovariantInterfaceImplementationRandomItemContentRelatedVideo, error) {
	var retval __premarshalCovariantInterfaceImplementationRandomItemContentRelatedVideo

	retval.Typename = v.Typename
	{

		dst := &retval.Next
		src := v.ContentFieldsVideo.Next
		var err error
		*dst, err = __marshalContentFieldsNextContent(
			&src)
		if err != nil {
			return nil, fmt.Errorf(
				"unable to marshal CovariantInterfaceImplementationRandomItemContentRelatedVideo.ContentFieldsVideo.Next: %w", err)
		}
	}
	{

		dst := &retval.Related
		src := v.ContentFieldsVideo.Related
		*dst = make(
			[]json.RawMessage,
			len(src))
		for i, src := range src {
			dst := &(*dst)[i]
			var err error
			*dst, err = __marshalContentFieldsRelatedContent(
				&src)
			if err != nil {
				return nil, fmt.Errorf(
					"unable to marshal CovariantInterfaceImplementationRandomItemContentRelatedVideo.ContentFieldsVideo.Related: %w", err)
			}
		}
	}
	return &retval, nil
}

// CovariantInterfaceImplementationRandomItemTopic includes the requested fields of the GraphQL type Topic.
type CovariantInterfaceImplementationRandomItemTopic struct {
	Typename string `json:"__typename"`
	// ID is the identifier of the content.
	Id      testutil.ID                                                       `json:"id"`
	Next    CovariantInterfaceImplementationRandomItemContentNextContent      `json:"-"`
	Related []CovariantInterfaceImplementationRandomItemContentRelatedContent `json:"-"`
}

// GetTypename returns CovariantInterfaceImplementationRandomItemTopic.Typename, and is useful for accessing the field via an interface.
func (v *CovariantInterfaceImplementationRandomItemTopic) GetTypename() string { return v.Typename }

// GetId returns CovariantInterfaceImplementationRandomItemTopic.Id, and is useful for accessing the field via an interface.
func (v *CovariantInterfaceImplementationRandomItemTopic) GetId() testutil.ID { return v.Id }

// GetNext returns CovariantInterfaceImplementationRandomItemTopic.Next, and is useful for accessing the field via an interface.
func (v *CovariantInterfaceImplementationRandomItemTopic) GetNext() CovariantInterfaceImplementationRandomItemContentNextContent {
	return v.Next
}

// GetRelated returns CovariantInterfaceImplementationRandomItemTopic.Related, and is useful for accessing the field via an interface.
func (v *CovariantInterfaceImplementationRandomItemTopic) GetRelated() []CovariantInterfaceImplementationRandomItemContentRelatedContent {
	return v.Related
}

func (v *CovariantInterfaceImplementationRandomItemTopic) UnmarshalJSON(b []byte) error {

	if string(b) == "null" {
		return nil
	}

	var firstPass struct {
		*CovariantInterfaceImplementationRandomItemTopic
		Next    json.RawMessage   `json:"next"`
		Related []json.RawMessage `json:"related"`
		graphql.NoUnmarshalJSON
	}
	firstPass.CovariantInterfaceImplementationRandomItemTopic = v

	err := json.Unmarshal(b, &firstPass)
	if err != nil {
		return err
	}

	{
		dst := &v.Next
		src := firstPass.Next
		if len(src) != 0 && string(src) != "null" {
			err = __unmarshalCovariantInterfaceImplementationRandomItemContentNextContent(
				src, dst)
			if err != nil {
				return fmt.Errorf(
					"unable to unmarshal CovariantInterfaceImplementationRandomItemTopic.Next: %w", err)
			}
		}
	}

	{
		dst := &v.Related
		src := firstPass.Related
		*dst = make(
			[]CovariantInterfaceImplementationRandomItemContentRelatedContent,
			len(src))
		for i, src := range src {
			dst := &(*dst)[i]
			if len(src) != 0 && string(src) != "null" {
				err = __unmarshalCovariantInterfaceImplementationRandomItemContentRelatedContent(
					src, dst)
				if err != nil {
					return fmt.Errorf(
						"unable to unmarshal CovariantInterfaceImplementationRandomItemTopic.Related: %w", err)
				}
			}
		}
	}
	return nil
}

type __premarshalCovariantInterfaceImplementationRandomItemTopic struct {
	Typename string `json:"__typename"`

	Id testutil.ID `json:"id"`

	Next json.RawMessage `json:"next"`

	Related []json.RawMessage `json:"related"`
}

func (v *CovariantInterfaceImplementationRandomItemTopic) MarshalJSON() ([]byte, error) {
	premarshaled, err := v.__premarshalJSON()
	if err != nil {
		return nil, err
	}
	return json.Marshal(premarshaled)
}

func (v *CovariantInterfaceImplementationRandomItemTopic) __premarshalJSON() (*__premarshalCovariantInterfaceImplementationRandomItemTopic, error) {
	var retval __premarshalCovariantInterfaceImplementationRandomItemTopic

	retval.Typename = v.Typename
	retval.Id = v.Id
	{

		dst := &retval.Next
		src := v.Next
		var err error
		*dst, err = __marshalCovariantInterfaceImplementationRandomItemContentNextContent(
			&src)
		if err != nil {
			return nil, fmt.Errorf(
				"unable to marshal CovariantInterfaceImplementationRandomItemTopic.Next: %w", err)
		}
	}
	{

		dst := &retval.Related
		src := v.Related
		*dst = make(
			[]json.RawMessage,
			len(src))
		for i, src := range src {
			dst := &(*dst)[i]
			var err error
			*dst, err = __marshalCovariantInterfaceImplementationRandomItemContentRelatedContent(
				&src)
			if err != nil {
				return nil, fmt.Errorf(
					"unable to marshal CovariantInterfaceImplementationRandomItemTopic.Related: %w", err)
			}
		}
	}
	return &retval, nil
}

// CovariantInterfaceImplementationRandomItemVideo includes the requested fields of the GraphQL type Video.
type CovariantInterfaceImplementationRandomItemVideo struct {
	Typename string `json:"__typename"`
	// ID is the identifier of the content.
	Id      testutil.ID                                                       `json:"id"`
	Next    CovariantInterfaceImplementationRandomItemContentNextContent      `json:"-"`
	Related []CovariantInterfaceImplementationRandomItemContentRelatedContent `json:"-"`
}

// GetTypename returns CovariantInterfaceImplementationRandomItemVideo.Typename, and is useful for accessing the field via an interface.
func (v *CovariantInterfaceImplementationRandomItemVideo) GetTypename() string { return v.Typename }

// GetId returns CovariantInterfaceImplementationRandomItemVideo.Id, and is useful for accessing the field via an interface.
func (v *CovariantInterfaceImplementationRandomItemVideo) GetId() testutil.ID { return v.Id }

// GetNext returns CovariantInterfaceImplementationRandomItemVideo.Next, and is useful for accessing the field via an interface.
func (v *CovariantInterfaceImplementationRandomItemVideo) GetNext() CovariantInterfaceImplementationRandomItemContentNextContent {
	return v.Next
}

// GetRelated returns CovariantInterfaceImplementationRandomItemVideo.Related, and is useful for accessing the field via an interface.
func (v *CovariantInterfaceImplementationRandomItemVideo) GetRelated() []CovariantInterfaceImplementationRandomItemContentRelatedContent {
	return v.Related
}

func (v *CovariantInterfaceImplementationRandomItemVideo) UnmarshalJSON(b []byte) error {

	if string(b) == "null" {
		return nil
	}

	var firstPass struct {
		*CovariantInterfaceImplementationRandomItemVideo
		Next    json.RawMessage   `json:"next"`
		Related []json.RawMessage `json:"related"`
		graphql.NoUnmarshalJSON
	}
	firstPass.CovariantInterfaceImplementationRandomItemVideo = v

	err := json.Unmarshal(b, &firstPass)
	if err != nil {
		return err
	}

	{
		dst := &v.Next
		src := firstPass.Next
		if len(src) != 0 && string(src) != "null" {
			err = __unmarshalCovariantInterfaceImplementationRandomItemContentNextContent(
				src, dst)
			if err != nil {
				return fmt.Errorf(
					"unable to unmarshal CovariantInterfaceImplementationRandomItemVideo.Next: %w", err)
			}
		}
	}

	{
		dst := &v.Related
		src := firstPass.Related
		*dst = make(
			[]CovariantInterfaceImplementationRandomItemContentRelatedContent,
			len(src))
		for i, src := range src {
			dst := &(*dst)[i]
			if len(src) != 0 && string(src) != "null" {
				err = __unmarshalCovariantInterfaceImplementationRandomItemContentRelatedContent(
					src, dst)
				if err != nil {
					return fmt.Errorf(
						"unable to unmarshal CovariantInterfaceImplementationRandomItemVideo.Related: %w", err)
				}
			}
		}
	}
	return nil
}

type __premarshalCovariantInterfaceImplementationRandomItemVideo struct {
	Typename string `json:"__typename"`

	Id testutil.ID `json:"id"`

	Next json.RawMessage `json:"next"`

	Related []json.RawMessage `json:"related"`
}

func (v *CovariantInterfaceImplementationRandomItemVideo) MarshalJSON() ([]byte, error) {
	premarshaled, err := v.__premarshalJSON()
	if err != nil {
		return nil, err
	}
	return json.Marshal(premarshaled)
}

func (v *CovariantInterfaceImplementationRandomItemVideo) __premarshalJSON() (*__premarshalCovariantInterfaceImplementationRandomItemVideo, error) {
	var retval __premarshalCovariantInterfaceImplementationRandomItemVideo

	retval.Typename = v.Typename
	retval.Id = v.Id
	{

		dst := &retval.Next
		src := v.Next
		var err error
		*dst, err = __marshalCovariantInterfaceImplementationRandomItemContentNextContent(
			&src)
		if err != nil {
			return nil, fmt.Errorf(
				"unable to marshal CovariantInterfaceImplementationRandomItemVideo.Next: %w", err)
		}
	}
	{

		dst := &retval.Related
		src := v.Related
		*dst = make(
			[]json.RawMessage,
			len(src))
		for i, src := range src {
			dst := &(*dst)[i]
			var err error
			*dst, err = __marshalCovariantInterfaceImplementationRandomItemContentRelatedContent(
				&src)
			if err != nil {
				return nil, fmt.Errorf(
					"unable to marshal CovariantInterfaceImplementationRandomItemVideo.Related: %w", err)
			}
		}
	}
	return &retval, nil
}

// CovariantInterfaceImplementationResponse is returned by CovariantInterfaceImplementation on success.
type CovariantInterfaceImplementationResponse struct {
	RandomItem CovariantInterfaceImplementationRandomItemContent `json:"-"`
	Root       CovariantInterfaceImplementationRootTopic         `json:"root"`
}

// GetRandomItem returns CovariantInterfaceImplementationResponse.RandomItem, and is useful for accessing the field via an interface.
func (v *CovariantInterfaceImplementationResponse) GetRandomItem() CovariantInterfaceImplementationRandomItemContent {
	return v.RandomItem
}

// GetRoot returns CovariantInterfaceImplementationResponse.Root, and is useful for accessing the field via an interface.
func (v *CovariantInterfaceImplementationResponse) GetRoot() CovariantInterfaceImplementationRootTopic {
	return v.Root
}

func (v *CovariantInterfaceImplementationResponse) UnmarshalJSON(b []byte) error {

	if string(b) == "null" {
		return nil
	}

	var firstPass struct {
		*CovariantInterfaceImplementationResponse
		RandomItem json.RawMessage `json:"randomItem"`
		graphql.NoUnmarshalJSON
	}
	firstPass.CovariantInterfaceImplementationResponse = v

	err := json.Unmarshal(b, &firstPass)
	if err != nil {
		return err
	}

	{
		dst := &v.RandomItem
		src := firstPass.RandomItem
		if len(src) != 0 && string(src) != "null" {
			err = __unmarshalCovariantInterfaceImplementationRandomItemContent(
				src, dst)
			if err != nil {
				return fmt.Errorf(
					"unable to unmarshal CovariantInterfaceImplementationResponse.RandomItem: %w", err)
			}
		}
	}
	return nil
}

type __premarshalCovariantInterfaceImplementationResponse struct {
	RandomItem json.RawMessage `json:"randomItem"`

	Root CovariantInterfaceImplementationRootTopic `json:"root"`
}

func (v *CovariantInterfaceImplementationResponse) MarshalJSON() ([]byte, error) {
	premarshaled, err := v.__premarshalJSON()
	if err != nil {
		return nil, err
	}
	return json.Marshal(premarshaled)
}

func (v *CovariantInterfaceImplementationResponse) __premarshalJSON() (*__premarshalCovariantInterfaceImplementationResponse, error) {
	var retval __premarshalCovariantInterfaceImplementationResponse

	{

		dst := &retval.RandomItem
		src := v.RandomItem
		var err error
		*dst, err = __marshalCovariantInterfaceImplementationRandomItemContent(
			&src)
		if err != nil {
			return nil, fmt.Errorf(
				"unable to marshal CovariantInterfaceImplementationResponse.RandomItem: %w", err)
		}
	}
	retval.Root = v.Root
	return &retval, nil
}

// CovariantInterfaceImplementationRootTopic includes the requested fields of the GraphQL type Topic.
type CovariantInterfaceImplementationRootTopic struct {
	ContentFieldsTopic `json:"-"`
	TopicFields        `json:"-"`
	Next               CovariantInterfaceImplementationRootTopicNextTopic      `json:"next"`
	Related            []CovariantInterfaceImplementationRootTopicRelatedTopic `json:"related"`
}

// GetNext returns CovariantInterfaceImplementationRootTopic.Next, and is useful for accessing the field via an interface.
func (v *CovariantInterfaceImplementationRootTopic) GetNext() CovariantInterfaceImplementationRootTopicNextTopic {
	return v.Next
}

// GetRelated returns CovariantInterfaceImplementationRootTopic.Related, and is useful for accessing the field via an interface.
func (v *CovariantInterfaceImplementationRootTopic) GetRelated() []CovariantInterfaceImplementationRootTopicRelatedTopic {
	return v.Related
}

func (v *CovariantInterfaceImplementationRootTopic) UnmarshalJSON(b []byte) error {

	if string(b) == "null" {
		return nil
	}

	var firstPass struct {
		*CovariantInterfaceImplementationRootTopic
		graphql.NoUnmarshalJSON
	}
	firstPass.CovariantInterfaceImplementationRootTopic = v

	err := json.Unmarshal(b, &firstPass)
	if err != nil {
		return err
	}

	err = json.Unmarshal(
		b, &v.ContentFieldsTopic)
	if err != nil {
		return err
	}
	err = json.Unmarshal(
		b, &v.TopicFields)
	if err != nil {
		return err
	}
	return nil
}

type __premarshalCovariantInterfaceImplementationRootTopic struct {
	Next CovariantInterfaceImplementationRootTopicNextTopic `json:"next"`

	Related []CovariantInterfaceImplementationRootTopicRelatedTopic `json:"related"`
}

func (v *CovariantInterfaceImplementationRootTopic) MarshalJSON() ([]byte, error) {
	premarshaled, err := v.__premarshalJSON()
	if err != nil {
		return nil, err
	}
	return json.Marshal(premarshaled)
}

func (v *CovariantInterfaceImplementationRootTopic) __premarshalJSON() (*__premarshalCovariantInterfaceImplementationRootTopic, error) {
	var retval __premarshalCovariantInterfaceImplementationRootTopic

	retval.Next = v.Next
	retval.Related = v.Related
	return &retval, nil
}

// CovariantInterfaceImplementationRootTopicNextTopic includes the requested fields of the GraphQL type Topic.
type CovariantInterfaceImplementationRootTopicNextTopic struct {
	TopicFields `json:"-"`
}

// GetNext returns CovariantInterfaceImplementationRootTopicNextTopic.Next, and is useful for accessing the field via an interface.
func (v *CovariantInterfaceImplementationRootTopicNextTopic) GetNext() TopicFieldsNextTopic {
	return v.TopicFields.Next
}

// GetRelated returns CovariantInterfaceImplementationRootTopicNextTopic.Related, and is useful for accessing the field via an interface.
func (v *CovariantInterfaceImplementationRootTopicNextTopic) GetRelated() []TopicFieldsRelatedTopic {
	return v.TopicFields.Related
}

func (v *CovariantInterfaceImplementationRootTopicNextTopic) UnmarshalJSON(b []byte) error {

	if string(b) == "null" {
		return nil
	}

	var firstPass struct {
		*CovariantInterfaceImplementationRootTopicNextTopic
		graphql.NoUnmarshalJSON
	}
	firstPass.CovariantInterfaceImplementationRootTopicNextTopic = v

	err := json.Unmarshal(b, &firstPass)
	if err != nil {
		return err
	}

	err = json.Unmarshal(
		b, &v.TopicFields)
	if err != nil {
		return err
	}
	return nil
}

type __premarshalCovariantInterfaceImplementationRootTopicNextTopic struct {
	Next TopicFieldsNextTopic `json:"next"`

	Related []TopicFieldsRelatedTopic `json:"related"`
}

func (v *CovariantInterfaceImplementationRootTopicNextTopic) MarshalJSON() ([]byte, error) {
	premarshaled, err := v.__premarshalJSON()
	if err != nil {
		return nil, err
	}
	return json.Marshal(premarshaled)
}

func (v *CovariantInterfaceImplementationRootTopicNextTopic) __premarshalJSON() (*__premarshalCovariantInterfaceImplementationRootTopicNextTopic, error) {
	var retval __premarshalCovariantInterfaceImplementationRootTopicNextTopic

	retval.Next = v.TopicFields.Next
	retval.Related = v.TopicFields.Related
	return &retval, nil
}

// CovariantInterfaceImplementationRootTopicRelatedTopic includes the requested fields of the GraphQL type Topic.
type CovariantInterfaceImplementationRootTopicRelatedTopic struct {
	TopicFields `json:"-"`
}

// GetNext returns CovariantInterfaceImplementationRootTopicRelatedTopic.Next, and is useful for accessing the field via an interface.
func (v *CovariantInterfaceImplementationRootTopicRelatedTopic) GetNext() TopicFieldsNextTopic {
	return v.TopicFields.Next
}

// GetRelated returns CovariantInterfaceImplementationRootTopicRelatedTopic.Related, and is useful for accessing the field via an interface.
func (v *CovariantInterfaceImplementationRootTopicRelatedTopic) GetRelated() []TopicFieldsRelatedTopic {
	return v.TopicFields.Related
}

func (v *CovariantInterfaceImplementationRootTopicRelatedTopic) UnmarshalJSON(b []byte) error {

	if string(b) == "null" {
		return nil
	}

	var firstPass struct {
		*CovariantInterfaceImplementationRootTopicRelatedTopic
		graphql.NoUnmarshalJSON
	}
	firstPass.CovariantInterfaceImplementationRootTopicRelatedTopic = v

	err := json.Unmarshal(b, &firstPass)
	if err != nil {
		return err
	}

	err = json.Unmarshal(
		b, &v.TopicFields)
	if err != nil {
		return err
	}
	return nil
}

type __premarshalCovariantInterfaceImplementationRootTopicRelatedTopic struct {
	Next TopicFieldsNextTopic `json:"next"`

	Related []TopicFieldsRelatedTopic `json:"related"`
}

func (v *CovariantInterfaceImplementationRootTopicRelatedTopic) MarshalJSON() ([]byte, error) {
	premarshaled, err := v.__premarshalJSON()
	if err != nil {
		return nil, err
	}
	return json.Marshal(premarshaled)
}

func (v *CovariantInterfaceImplementationRootTopicRelatedTopic) __premarshalJSON() (*__premarshalCovariantInterfaceImplementationRootTopicRelatedTopic, error) {
	var retval __premarshalCovariantInterfaceImplementationRootTopicRelatedTopic

	retval.Next = v.TopicFields.Next
	retval.Related = v.TopicFields.Related
	return &retval, nil
}

// TopicFields includes the GraphQL fields of Topic requested by the fragment TopicFields.
type TopicFields struct {
	Next    TopicFieldsNextTopic      `json:"next"`
	Related []TopicFieldsRelatedTopic `json:"related"`
}

// GetNext returns TopicFields.Next, and is useful for accessing the field via an interface.
func (v *TopicFields) GetNext() TopicFieldsNextTopic { return v.Next }

// GetRelated returns TopicFields.Related, and is useful for accessing the field via an interface.
func (v *TopicFields) GetRelated() []TopicFieldsRelatedTopic { return v.Related }

// TopicFieldsNextTopic includes the requested fields of the GraphQL type Topic.
type TopicFieldsNextTopic struct {
	// ID is documented in the Content interface.
	Id testutil.ID `json:"id"`
}

// GetId returns TopicFieldsNextTopic.Id, and is useful for accessing the field via an interface.
func (v *TopicFieldsNextTopic) GetId() testutil.ID { return v.Id }

// TopicFieldsRelatedTopic includes the requested fields of the GraphQL type Topic.
type TopicFieldsRelatedTopic struct {
	// ID is documented in the Content interface.
	Id testutil.ID `json:"id"`
}

// GetId returns TopicFieldsRelatedTopic.Id, and is useful for accessing the field via an interface.
func (v *TopicFieldsRelatedTopic) GetId() testutil.ID { return v.Id }

func CovariantInterfaceImplementation(
	client graphql.Client,
) (*CovariantInterfaceImplementationResponse, error) {
	req := &graphql.Request{
		OpName: "CovariantInterfaceImplementation",
		Query: `
query CovariantInterfaceImplementation {
	randomItem {
		__typename
		id
		next {
			__typename
			... ContentFields
		}
		related {
			__typename
			... ContentFields
		}
	}
	root {
		... ContentFields
		... TopicFields
		next {
			... TopicFields
		}
		related {
			... TopicFields
		}
	}
}
fragment ContentFields on Content {
	next {
		__typename
		id
	}
	related {
		__typename
		id
	}
}
fragment TopicFields on Topic {
	next {
		id
	}
	related {
		id
	}
}
`,
	}
	var err error

	var data CovariantInterfaceImplementationResponse
	resp := &graphql.Response{Data: &data}

	err = client.MakeRequest(
		nil,
		req,
		resp,
	)

	return &data, err
}