Data not returned from REST datasource in Apollo server for graphQL - graphql

Question

I am trying out the basic implementation for Apollo server for GraphQL with my REST API calls as Data Sources. I do not see any data returned from the same even though there is data returned when I call the API separately. Can anyone help figure out what could be going wrong?
PS: I have CORS enabled on my API so not sure if I am passing that too correctly. I do not have any idea how to figure out what URL this is calling.
My sample code below:
const { ApolloServer, gql } = require('apollo-server');
const { RESTDataSource } = require('apollo-datasource-rest');
class Contact extends RESTDataSource {
constructor() {
super();
this.baseURL = 'http://localhost:8080/objects/';
}
async getContactById(id) {
return this.get(`contact/${id}`);
}
async getAllContacts() {
const data = await this.get(`contact`);
return data.results;
}
// an example making an HTTP PUT request
async newContact(contact) {
return this.put(
'contact', // path
contact, // request body
);
}
};
// Type definitions define the "shape" of your data and specify
// which ways the data can be fetched from the GraphQL server.
const typeDefs = gql`
# Comments in GraphQL are defined with the hash (#) symbol.
type Query {
allContacts: [Contact]
contactById(id: ID): Contact
}
type Contact {
id: ID
contact_name: String
}
`;
// Resolvers define the technique for fetching the types in the
// schema.
const resolvers = {
Query: {
contactById: async (_source, { id }, { dataSources }) => {
return dataSources.contact.getContactById(id);
},
allContacts: async (_source, _args, { dataSources }) => {
return dataSources.contact.getAllContacts();
},
},
};
// In the most basic sense, the ApolloServer can be started
// by passing type definitions (typeDefs) and the resolvers
// responsible for fetching the data for those types.
const server = new ApolloServer({
typeDefs,
resolvers,
dataSources: () => {
return {
contact : new Contact(),
};
},
cors : true,
});
// This `listen` method launches a web-server. Existing apps
// can utilize middleware options, which we'll discuss later.
server.listen().then(({ url }) => {
console.log(`🚀 Server ready at ${url}`);
});
Below is the request and response from the GraphQL playground:
query {
contactById (id : 5) {
id
contact_name
}
}
Response:
{
"data": {
"contactById": {
"id": null,
"contact_name": null
}
}
}