如何从解析器中的 graphql 获取数据

Question

Within my resolver I seem to be unable to fetch connected data

this works in the graphql playground (prisma) but I am unsure of the syntax about how to form a resolver in apollo server

// my typedef for activity is

type Activity {
    id: ID! @id
    ActivityType: ActivityType!
    title: String!
    date: DateTime
    user: User!
    distance: Float!
    distance_unit: Unit!
    duration: Float!
    elevation: Float
    elevation_unit: Unit
    createdAt: DateTime! @createdAt
    updatedAt: DateTime! @updatedAt

// and my resolver currently looks like this

async activity(parent, args, ctx, info) {
        const foundActivity = await ctx.db.query.activity({
            where: {
                id: args.id
            }
        });
        // todo fetch user data from query
        console.log(foundActivity);
    }

// where db has been placed onto the ctx (context)
// the CL gives all of the data for Activity apart from the user

// in the playground I would do something like this

query activity {
  activity(where: {
    id: "cjxxow7c8si4o0b5314f9ibek"
  }){
    title
    user {
      id
      name
    }
  }
}

// but I do not know how to specify what is returned in my resolver.

console.log(foundActivity) gives:

{ id: 'cjxxpuh1bsq750b53psd2c77d',
  ActivityType: 'CYCLING',
  title: 'Test Activity',
  date: '2019-07-10T20:21:27.681Z',
  distance: 13.4,
  distance_unit: 'KM',
  duration: 90030,
  elevation: 930,
  elevation_unit: 'METERS',
  createdAt: '2019-07-10T20:48:50.879Z',
  updatedAt: '2019-07-10T20:48:50.879Z' }

Prisma is the DB ORM and then I have an Apollo-Server 2 server running on top of that. Unfortunately, stack overflow also thinks that there is too much code on this post so I will have to waffle on about inconsequential gibberish due to the fact that their system can't handle it.

Answer 1

You will have to implement a resolver for Activity.user . Unfortunately your entity does not seem to contain a reference to the user. First, add the user connection to your Prisma data model. Then implement a resolver for Activity.user . I am not very familiar with Prisma 1 but this naive implementation should already do what you want:

let resolvers = {
  Query: {
    // ...
  },
  Activity: {
    user(parent, args, ctx) {
      return ctx.db.query.activity({ id: parent.id }).user();
    }
  }
}

Find out more about resolving relations in Prisma here

Answer 2

So the answer was incredibly simple: I just add a second argument to the query (after the "where" with a gql tag of the data shape to be returned so my code now looks like:

const foundActivity = await ctx.db.query.activity(
        {
            where: {
                id: args.id
            }
        },
        `{id title user { id name }}`
    );