在带有苦艾酒的GraphQL中表示Elixir/Ecto关联

defmodule MyApp.Post do
  use Ecto.Schema

  schema "posts" do
    field :title, :string
    has_many :comments, MyApp.Comment
  end
end

defmodule MyApp.Comment do
  use Ecto.Schema

  schema "comments" do
    field :content, :string
    belongs_to :post, MyApp.Post
  end
end

defmodule MyApp.Schema do
  use Absinthe.Schema

  object :post do
    field :title, :string
    field :comments, list_of(:comment)
  end

  object :comment do
    field :content, :string
    field :post, :post
  end

  query do
    field :posts, list_of(:post) do
      resolve(fn _, _ ->
        MyApp.Repo.all(MyApp.Post)
      end)
    end
  end

  def repo do
    Application.get_env(:my_app, MyApp.Repo)
  end

  def context(ctx) do
    Map.put(ctx, :repo, repo())
  end

  def absinthe_plug(conn, _) do
    Absinthe.Plug.put_options(conn, context: context(conn))
  end
end

defmodule MyApp.Router do
  use MyApp.Web, :router

  forward "/graphql", Absinthe.Plug,
    schema: MyApp.Schema,
    context: %{
      repo: MyApp.Repo
    }
end

query {
  posts {
    title
    comments {
      content
    }
  }
}