graphql_multiple_schemas.js

const express = require('express');
const graphql = require('express-graphql');
const graphqlTools = require('graphql-tools');

const app = express();

// Sample Data
const usersData = [{_id: 1000, name: 'Dhaval', email: 'dhaval@appgambit.com'}];
const blogsData = [{_id: 1, title: 'Hello', content: 'World', owner: usersData[0]}];

// Simple Blog schema with ID, Title and Content fields
const typeDefs = `
    type User{
        _id: Int,
        name: String,
        email: String
    }

    type Blog{
        _id: Int,
        title: String!,
        content: String!,
        owner: User
    }    

    type Query{
        blogs: [Blog],
        blog(_id: Int): Blog,
        users: [User],
        user(_id: Int): User
    }
`;

// Resolver to match the GraphQL query and return data
const resolvers = {
    Query: {
        blogs(root, args, context, info) {            
            return blogsData;
        },
        blog(root, {_id}, context, info){
            return blogsData.find((b) => b._id == _id);
        },
        users(root, {}, context, info){
            return usersData;
        },
        user(root, {_id}, context, info){
            return usersData.find((u) => u._id == _id);
        }
    }
};

// Build the schema with Type Definitions and Resolvers
const schema = graphqlTools.makeExecutableSchema({typeDefs, resolvers});

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

app.listen(3000)