View Source Custom Queries & Mutations

You can define your own queries and mutations in your schema, using Absinthe's tooling. See their docs for more.

You probably don't need this!

You can define generic actions in your resources which can return any type that you want, and those generic actions will automatically get all of the goodness of AshGraphql, with automatic data loading and type derivation, etc. See the generic actions guide for more.

Using AshGraphql's types

If you want to return resource types defined by AshGraphql, however, you will need to use AshGraphql.load_fields_on_query/2 to ensure that any requested fields are loaded.

For example:

require Ash.Query

query do
  field :custom_get_post, :post do
    arg(:id, non_null(:id))

    resolve(fn %{id: post_id}, resolution ->
      MyApp.Blog.Post
      |> Ash.Query.filter(id == ^post_id)
      |> AshGraphql.load_fields_on_query(resolution)
      |> Ash.read_one(not_found_error?: true)
      |> AshGraphql.handle_errors(MyApp.Blog.Post, resolution)
    end)
  end
end

Alternatively, if you have records already that you need to load data on, use AshGraphql.load_fields/3:

query do
  field :custom_get_post, :post do
    arg(:id, non_null(:id))

    resolve(fn %{id: post_id}, resolution ->
      with {:ok, post} when not is_nil(post) <- Ash.get(MyApp.Blog.Post, post_id) do
        AshGraphql.load_fields(post, MyApp.Blog.Post, resolution)
      end
      |> AshGraphql.handle_errors(MyApp.Blog.Post, resolution)
    end)
  end
end