apollo server resolvers for blog article

apollo-resolvers.js

const resolvers = {
  River: {
    async streams(river) {
      return await Streams.find({ riverId: river.id }).toArray();
    }
  },
  Stream: {
    async river(stream) {
      return await Streams.findOne({ riverId: stream.riverId });
    },
    async brooks(stream) {
      return await Brooks.find({ streamId: stream.id }).toArray();
    }
  },
  Brook: {
    async stream(brook) {
      return await Brooks.findOne({ streamId: brook.streamId });
    }
  },
  Query: {
    async river(_, { id }) {
      return await River.find({ id }).toArray(); //find using mongodb
    },
    async rivers() {
      return River.find({}).toArray(); //find using mongodb
    },
    async BrooksByRiverName(_, { name }) {
      //This search uses algolia to defer full text searches
      const { hits } = await index.search(name);
      return !!hits.length
        ? Brook.find({ id: hits.map(hit => hit.brookId) }).toArray()
        : null;
    }
  }
};