Handles loading a resource or resources and storing them in the Speakeasy.Context for later resolving.

Callback functions must return a type of: any | {:ok, any} | {:error, error} | nil. It is effectively looking for the return signatures of Phoenix Contexts.

Examples

Loading a resource with a 1-arity function will receive the Absinthe arguments:

object :post_mutations do
  @desc "Create post"
  field :create_post, type: :post do
    arg(:name, non_null(:string))
    middleware(Speakeasy.Authn)
    middleware(Speakeasy.LoadResource, fn(attrs) -> MyApp.Posts.create_post(attrs) end)
  end
end

Loading a resource with a 2-arity function will receive the Absinthe arguments and the SpeakEasy current user:

object :post_mutations do
  @desc "Create post"
  field :create_post, type: :post do
    arg(:name, non_null(:string))
    middleware(Speakeasy.Authn)
    middleware(Speakeasy.LoadResource, fn(attrs, user) -> MyApp.Posts.create_post(attrs, user) end)
  end
end