MongoDB has support for the rich and powerful query language. Let's take a step ahead and integrate MongoDB to our Apollo GraphQL server. Side-Note: If you've not set up your server yet, I highly recommend to go through this article and get your server up and running! It makes it super-easy to implement functionalities like Data Fetching, State Management, Caching, Authentication and many more.
The ApolloServer function takes in the typeDefs (Schema) and resolvers. It exports an ApolloServer function and a gql tag. We're using the apollo-server-express module to implement our server.We built our Food Ordering System using the middleware approach ( Putting the middleware thing in words to make it look human-friendly - A middleware can listen to all the incoming requests, do some work on the request object to cook appropriate response and pass it on to the next middleware). It can be integrated into the express server in a stand-alone or middleware approach.
The Apollo GraphQL server can be implemented in many popular NodeJs HTTP frameworks.It includes the implementation for the GraphQL server, GraphQL client and the additional tooling for various other features. The Apollo GraphQL platform is one of them and is being used by many companies from startups to big shots. Many GraphQL platforms started using the core graphql implementation and built a complete system on top of it.It does the complex work of defining the type system, parsing, validating and executing the queries. The graphql module is a reference implementation built by Facebook in JavaScript. It best describes how a certain functionality should be implemented. GraphQL is a query language and a specification.Let's recap all that we learned in the last article: In the last article, we set up our Apollo GraphQL server for the Food Ordering System. We'll also be implementing resolvers to fetch or mutate data on the server. In this article, we're going to connect a MongoDB data source to the Apollo GraphQL server. It is data source agnostic and can be integrated with any of the popular databases like MySQL, MongoDB, PostgreSQL, etc.
The GraphQL layer sits between the data source and the client. Part 8: Implementing GraphQL Subscriptions using PubSub.Part 7: GraphQL Subscriptions - Core Concepts.Part 5: Introducing the Apollo GraphQL Platform for implementing the GraphQL Specification.
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This article is part 6 of the series on Exploring GraphQL.
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