Getting real-time updates with Subscriptions for Expo and React Native

In this section, we will learn how to use GraphQL Subscriptions to monitor for changes. Subscriptions help us query the database and listen to changes in the data. This helps us provide instant updates as we can maintain an active connection with the database. Subscriptions are useful for tasks such as creating real-time notifications when something has changed in the database. Open the App.tsx file and enter the following code anywhere within the useEffect hook:

1. The createSubscription method will listen to the create action on the database with the autogenerated code called onCreatePost of the subscriptions object. It will do this to fetch posts when new ones are posted:

   useEffect(() => {
       const fetchPosts = async (): Promise<any> => {
         try {
           console.log("fetching posts");
    ...