Unable to bind to interface error when using apollo federation with gqlgen

When I tried using gqlgen to use Apollo Federation for microservices, I got a ʻunable to bind to interface error on go run github.com/99designs/gqlgen`.

I was mapping a go struct to a schema, and I was getting an error there. Looking at the gqlgen code, it seems that the interface cannot be satisfied unless it is added to the go struct, so when I added the IsEntity () method as shown below, the error disappeared.

type User struct {
    ID: int
    Name: string
}

func (m User) IsEntity() {}

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