GraphQL Apollo resolver not firing?

Question

Resolver

export const resolvers = {
  ...
  Mutation: {
    register: async (
      _: unknown,
      { input }: { input: RegisterInput },
      { prisma }: GraphQLRequestContext
    ): Promise<RegisterResult> => {
      const { email, password, lastName, firstName } = input
      console.log('hello')

      ...

      (some ifs that return {
        __typename: 'BadRequest',
        message: 'Bad request',
      })

      ...
      return { __typename: 'AuthResult', token }
    },
  },
}

Typedefs

export const typeDefs = gql`
  type BadRequest {
    message: String!
  }

  type Mutation {
    register(input: RegisterInput!): RegisterResult!
  }

  input RegisterInput {
    email: String!
    password: String!
    firstName: String
    lastName: String
  }

  type AuthResult {
    token: String!
  }

  union RegisterResult = AuthResult | BadRequest
`

Server

const server = new ApolloServer({
  typeDefs,
  resolvers,
  context: () => ({ prisma }),
})

When making a request with this mutation I get "Cannot return null for non-nullable field Mutation.register."

If I make RegisterResult nullable in the mutation result I get

{
  "data": {
    "register": null
  }
}

The console log in the resolver does not appear in the logs, in either case. The types are generated automatically from the typedefs.

Out of curiosity, how are you importing resolvers? If you console.log(resolvers); at the point where you call new ApolloServer is it the object you expect? — loganfsmyth
@loganfsmyth bizarrely it is out of date? It's in a ./resolvers/index.ts which I reference like import { resolvers } from './resolvers' . Moving it out of the index file fixes this, importing from the index file at all is giving this problem still, I've never experienced this before — user3287552
Weird, not sure what to say there. Maybe your build is caching something wrong somehow. — loganfsmyth

Angad Angad · Accepted Answer · 2021-07-17T02:47:28

Could you please share a sample of how you are calling this mutation? Seems like from the error message that you are not passing in the required fields.

These should be passed in :

email: String!
password: String!

GraphQL Apollo resolver not firing?

1 Answers