'GraphQL: TypeError: Cannot read property of undefined

I have an Apollo GraphQL projects where I have created my own Query and Mutations. I have done using mock data and Query and Mutation works fine. But when I am trying to do with Sequelize ORM, I am getting the error

"TypeError: Cannot read property 'getListings' of undefined",
            "    at listings (/home/ayman/Desktop/apollo-graphql/graphql-app/functions/graphql.js:50:19)",
            "    at field.resolve (/home/ayman/Desktop/apollo-graphql/graphql-app/node_modules/graphql-extensions/dist/index.js:134:26)"

Query and Mutations in graphql.js:

const { ApolloServer, gql} = require("apollo-server-lambda");
const { Listing, User } = require("../db");
const jwt = require("jsonwebtoken");

const typeDefs = gql`
  type Query {
    listings: [Listing!]!
  }
  type Mutation {
    createListing(input: CreateListingInput!): Listing!
  }
  input CreateListingInput {
    title: String!
    description: String
    url: String!
    notes: String
  }
  type Contact {
    id: ID!
    name: String!
    company: Company
    email: String
    notes: String
  }
  type Company {
    id: ID!
    name: String!
    logo: String
    listings: [Listing!]!
    url: String
  }
  type Listing {
    id: ID!
    title: String!
    description: String
    url: String!
    notes: String
    company: Company
    contacts: [Contact!]!
  }
`;

const resolvers = {
  Query: {
    listings(_, __, { user }) {
      return user.getListings();
    },
  },
  Mutation: {
    createListing(_, { input }, { user }) {
      return Listing.create({ ...input, userId: user.id });
    },
  },
};

const server = new ApolloServer({
  typeDefs,
  resolvers,
});

exports.handler = server.createHandler();

I have Sequilize along with Postgres database:

db.js

const Sequelize = require("sequelize");

const sequelize = new Sequelize(process.env.DB_CONNECTION_STRING, {
  dialect: "pg",
  dialectModule: require('pg'),
  dialectOptions: {
    ssl: true,
  },
});

class User extends Sequelize.Model {}
User.init(
  {
    email: Sequelize.STRING,
    password: Sequelize.STRING,
  },
  {
    sequelize,
    modelName: "user",
  }
);

class Listing extends Sequelize.Model {}
Listing.init(
  {
    title: Sequelize.STRING,
    description: Sequelize.TEXT,
    url: Sequelize.STRING,
    notes: Sequelize.TEXT,
  },
  {
    sequelize,
    modelName: "listing",
  }
);

Listing.belongsTo(User);
User.hasMany(Listing);

exports.sequelize = sequelize;
exports.User = User;
exports.Listing = Listing;

Github Link

Run using netlify dev
Go to URL: http://localhost:8888/.netlify/functions/graphql
Sample GraphQL query

{
 listings {
     id
     title
     description
     url
     company {
        name
        url
     }
    }
}

Solution 1:^[1]

return user.getListings();

you probably mean User, because user is undefined

Solution 2:^[2]

I see, you are trying to access user object from context. Please check the context definition. It should return an object containing user object explicitly.

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution	Source
Solution 1	Antonin Riche
Solution 2	Dheeraj Bharsiya

'GraphQL: TypeError: Cannot read property of undefined

Solution 1:[1]

Solution 2:[2]

Sources

Related Questions

Solution 1:^[1]

Solution 2:^[2]