ash_graphql/documentation/introduction/getting_started.md

Getting Started

Get familiar with Ash resources

If you haven't already, read the getting started guide for Ash. This assumes that you already have resources set up, and only gives you the steps to add AshGraphql to your resources/apis.

Add the API Extension

defmodule MyApi do
  use Ash.Api, extensions: [
    AshGraphql.Api
  ]
  
  graphql do
    authorize? false # Defaults to `true`, use this to disable authorization for the entire API (you probably only want this while prototyping)
  end
end

Add graphql to your resources

defmodule Post do
  use Ash.Resource,
    extensions: [
      AshGraphql.Resource
    ]
    
  graphql do
    type :post
    
    fields [:name, :count_of_comments, :comments] # <- a list of all of the attributes/relationships/aggregates to include in the graphql API
    
    queries do
      get :get_post, :default # <- create a field called `get_post` that uses the `default` read action to fetch a single post
      list :list_posts, :default # <- create a field called `list_posts` that uses the `default` read action to fetch a list of posts
    end
    
    mutations do
      # And so on
      create :create_post, :default
      update :update_post, :default
      destroy :destroy_post, :default
    end
  end
end

Add AshGraphql to your schema

If you don't have an absinthe schema, you can create one just for ash

If you don't have any queries or mutations in your schema, you may need to add empty query and mutation blocks. If you have no mutations, don't add an empty mutations block, same for queries.

defmodule MyApp.Schema do
  use Absinthe.Schema

  use AshGraphql, api: AshExample.Api

  query do
  end

  mutation do
  end
end