How to query firestore() for graphql resolver?

@raphael_tillman 

To query Firestore in a GraphQL resolver, you can use the Firestore SDK to interact with your Firebase project's Firestore database. Here's a general outline of how you can do this:

1. Install the Firebase Admin SDK by running the following command in your project directory:

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npm install firebase-admin

1. Initialize the Firebase Admin SDK in your application code by importing the firebase-admin package and initializing it with your Firebase project's service account credentials. You can do this in the resolver file or in a separate file that is required in the resolver file.

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const admin = require('firebase-admin');

const serviceAccount = require('path/to/your/serviceAccountKey.json');

admin.initializeApp({
  credential: admin.credential.cert(serviceAccount),
  databaseURL: 'https://your-project-id.firebaseio.com'
});

1. In your resolver function, use the Firebase Admin SDK to query Firestore. You can use the admin.firestore().collection('your_collection').get() method to query a collection in Firestore. Here's an example of how you can query a collection and return the data as a JSON object:

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const { GraphQLJSONObject } = require('graphql-type-json');

const resolvers = {
  Query: {
    getFirestoreData: async (parent, args, context) => {
      const querySnapshot = await admin.firestore().collection('your_collection').get();
      const data = [];

      querySnapshot.forEach((doc) => {
        data.push(doc.data());
      });

      return data;
    }
  }
};

module.exports = resolvers;

1. Update your GraphQL schema to include the getFirestoreData query and define the return type:

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type Query {
  getFirestoreData: [JSONObject]
}

With these steps, you should now be able to query Firestore in your GraphQL resolver using the Firebase Admin SDK.