Add dataloader/2 function to helpers

lib/absinthe/resolution/helpers.ex

@@ -159,9 +159,47 @@ defmodule Absinthe.Resolution.Helpers do
  """
  @spec dataloader(Dataloader.source_name()) :: dataloader_key_fun()
  def dataloader(source) do
+ dataloader(source, [])
+ end
+
+ @doc """
+ Resolve a field with a dataloader source.
+
+ This function is not imported by default. To make it available in your module do
+
+ ```
+ import Absinthe.Resolution.Helpers
+ ```
+
+ Same as `dataloader/3`, but it infers the resource name from the field name. For `opts` see
+ `dataloader/3` on what options can be passed in.
+
+ ## Examples
+
+ ```
+ object :user do
+ field :posts, list_of(:post),
+ resolve: dataloader(Blog, args: %{deleted: false})
+
+ field :organization, :organization do
+ resolve dataloader(Accounts, use_parent: false)
+ end
+
+ field(:account_active, non_null(:boolean), resolve: dataloader(
+ Accounts, callback: fn account, _parent, _args ->
+ {:ok, account.active}
+ end
+ )
+ )
+ end
+ ```
+
+ """
+ @spec dataloader(Dataloader.source_name(), [dataloader_opt]) :: dataloader_key_fun()
+ def dataloader(source, opts) when is_list(opts) do
  fn parent, args, %{context: %{loader: loader}} = res ->
  resource = res.definition.schema_node.identifier
- do_dataloader(loader, source, resource, args, parent, [])
+ do_dataloader(loader, source, resource, args, parent, opts)
  end
  end