@key on interface panics

[carldunham]

What happened?

When adding @key to interface in federation, gqlgen run panics.

The Apollo Federation 1 spec allows this, but it isn't clear what, if anything, gqlgen should do with it. A change between 0.14.0 and 0.16.0 introduced a panic to make it explicit that this wasn't supported. However, it may be benign, and need only warn.

What did you expect?

Silently ignore the @key directive.

Minimal graphql.schema and models to reproduce

extend interface Hello @key(fields: "name") {
name: String!
secondary: String!
}

versions

• gqlgen version? 0.16.0
• go version? 1.17
• dep or go modules? mod