This calls LoadResource under the hood and extracts the :id out of the arguments map.

Examples

object :post_mutations do
  @desc "Create post"
  field :create_post, type: :post do
    arg(:blog_id, non_null(:string))
    arg(:name, non_null(:string))
    middleware(Speakeasy.Authn)
    middleware(Speakeasy.LoadResourceBy, {:blog_id, &MyApp.Blogs.get_blog/1})
    middleware(Speakeasy.Authz, {MyApp.Posts, :create_post})
    middleware(Speakeasy.Resolve, fn (blog, attrs, _user) -> MyApp.Posts.create_post(blog, attrs) end)

    # This is a shorthand of:
    # middleware(Speakeasy.LoadResource, fn(attrs) -> MyApp.Post.get_post(attrs[:id]))
  end
end