How to get response status in GraphQL using node js?

Question

In my node js code

var express_graphql = require('express-graphql');
var { buildSchema } = require('graphql');

var schema = buildSchema(`
    type Query {      
        getCandidateKey(email  : String): GetCandidateKey
    }

 type GetCandidateKey{
        CandidateID : Int
    }
`);

here i am executing the stored procedure

var GetCandidateKey = async function (args) {
    let email = args.email
    let query = "exec getCandidateKey @EmailID='" + email + "';"; //executing stored procedures
    const pool = await poolPromise
    const result = await pool.request().query(query)
    return result.recordset[0]
}

Root resolver

var root = {
    getCandidateKey: GetCandidateKey,
};

Create an express server and a GraphQL endpoint

  app.use('/graphql', express_graphql({
        schema: schema,
        rootValue: root,
        graphiql: true
    }));

The result i am getting

The result i want if query successfully execute

{
 "status" : "success"
  "data": {
    "getCandidateKey": {
      "CandidateID": 56
    }
  }
}

For any error

    {
     "status" : "error"   //for throwing error
      "data": null    
    }

PS I am new to GraphQL and SQL Server.

Answer 1

Modify this function so that it'll send the required object as the response.

var GetCandidateKey = async function (args) {
    try {
        let email = args.email
        let query = "exec getCandidateKey @EmailID='" + email + "';"; //executing stored procedures
        const pool = await poolPromise
        const result = await pool.request().query(query)
        return {
            status: 'success',
            data: result.recordset[0]
        };
    } catch (e) {
        return {
            status: 'error',
            data: null
        };
    }
}

And also change the GraphQL types as needed.

Update

You can use the following schema:

var schema = buildSchema(`
    type Query {      
        getCandidateKey(email  : String): CandidateResponse
    }

    type CandidateResponse {
        status: String!
        data: GetCandidateKey
    }

    type GetCandidateKey {
        CandidateID : Int
    }
`);