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apollo federationをgqlgenで使う際にunable to bind to interfaceエラーが発生する

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マイクロサービス化のためにApollo Federationを使おうと思ってgqlgenで試していたところ、go run github.com/99designs/gqlgenunable to bind to interfaceエラーが発生。

自分はgoの構造体をschemaにマッピングしていたのだが、そこでエラーが発生していました。
gqlgenのコードを見るとgoのstructにはやさないとinterfaceを満たせないようなので、以下のようにIsEntity()メソッドを追加したところ、エラーが出なくなった。

type User struct {
    ID: int
    Name: string
}

func (m User) IsEntity() {}
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