apollo-server -有条件地从选择集中排除字段

type Query {
  user(id: ID!): User
}

type User {
  id: ID!
  name: String!
  email: String! @exclude(if: true)
  address: String! @exclude(if: false)
}

const resolvers = {
  User: {
    email: {
      resolve: (parent, args, context, info) => {
        if (info.fieldNodes[0].directives.some(d => d.name.value === 'exclude')) {
          const excludeDirective = info.fieldNodes[0].directives.find(d => d.name.value === 'exclude');
          const shouldExclude = excludeDirective.arguments.some(arg => arg.name.value === 'if' && arg.value.value === true);
          if (shouldExclude) {
            throw new Error('Field excluded');
          }
        }
        return parent.email;
      },
    },
  },
};