Apollo Query Batching and graphql-ruby

Query batching is a way to speed up your application. Instead of waiting on multiple client-server roundtrips to load data, everything is loaded at once.

Enabling query batching in Apollo is as easy as using another network provider:

  import ApolloClient, { createBatchingNetworkInterface } from 'apollo-client';
  const batchingNetworkInterface = createBatchingNetworkInterface({
    uri: 'localhost:3000',
    batchInterval: 10,  // in milliseconds
    batchMax: 10,
    opts: {
      // Options to pass along to `fetch`
  const apolloClient = new ApolloClient({
    networkInterface: batchingNetworkInterface,

On the Ruby you need to make a few more changes, but all can be done in your GraphQL Controller. You need to map the array of given queries to a format that graphql-ruby understands. The gist below handles both batched and non-batched queries.

def execute
  context = {}

  # Apollo sends the params in a _json
  # variable when batching is enabled
  # see the Apollo Documentation about query batching:
  result = if params[:_json]
    queries = params[:_json].map do |param|
        query: param['query'],
        operation_name: param['operationName'],
        variables: ensure_hash(param['variables']),
        context: context
      operation_name: params[:operationName],
      variables: ensure_hash(params[:variables]),
      context: context

  render json: result

Batching queries can reduce the time your app is loading by a large amount, making for a more pleasant user experience.

More posts

Tailwind CLI with Yew and Trunk

Let's see if we can go node-less with Yew.

Serving static CORS JSON with Caddy

For a simple side-project, I needed to serve static JSON, with proper CORS headers.

Switching to Svelte

I have rewritten my middleman site to Svelte/SvelteKit, here's what I encountered.

Remote uploads with pre-signed URLs on Scaleway's object storage.

Or, make sure your headers match, otherwise you'll get a lot of strange errors.

Upload a file to an AWS pre-signed S3 url with RestClient.

Or, how something so simple cost me so much time.