Craft GraphQL APIs in Elixir with Absinthe

Submitting Subscriptions

Now that we can create orders, we’re at the perfect spot to introduce the first basic subscription that will support pushing these orders as they’re created out to subscribed clients. You’ll first need to define a subscription field in your schema, and then you’ll also need a way to actually trigger this subscription when the :place_order mutation runs.

06-chp.subscriptions/4-publish/lib/plate_slate_web/schema.ex

subscription do
  field :new_order, :order do

    config fn _args, _info ->
      {:ok, topic: "*"}
    end
  end
end

For the most part, this is a pretty ordinary-looking field. We’ve got another top-level object, subscription, to house our subscription fields, and then the :new_order, which ...