通过将GraphQL作为解析参数之一传递来查询数据库

Question

I am interested in learning GraphQL so I can build real fullstack apps.

I am trying to query my mongodb in my resolve function inside schema. I am getting error:

"message": "mongodb.getCollection is not a function"

This is pretty straightforward, my mongodb argument has no getCollection function, the problem is I don't know why. I'm using mongodb, graphqlhttp, express-graphql.

Here's my code:

In my index.js file:

const graphql = express();
  graphql.use('/', graphQLHTTP(async () => ({
    graphiql: true,
    pretty: true,
    schema,
    context: {
      mongodb: await mongodb
    }
})));

In my schema file that's my resolve snippet:

resolve: async(source, { category }, { mongodb }) => {
  return await 
    stories: mongodb.getCollection('stories').find({})
  };
}

I am completly stuck at the moment, do you guys know what's wrong with my code?

Answer 1

Try to use:

  resolve: (obj, args, ctx) => {
    return mongodb.getCollection('stories').find({})
  }

needsless to say- the result from the DB should match the GraphQLObject type, something like:

new GraphQLList(storyType)

Answer 2

First of all, when you are using the .find({}) function, its generally accepted to use GraphQLList as mentioned about, because it fetches everything from the database, and I suggest you make use of your console.log(); more often. And from my own knowledge of graphQL, the resolve function accepts two params, the parent data and your args. Check Out this tutorial link to better learn how to use GQL to query a mongodb.