defmodule Blog.Abilities do
  defimpl Canada.Can, for: Blog.User do
    def can?(%Blog.User{}, :index, Blog.User), do: true
    def can?(%Blog.User{}, _, _), do: true
    def can?(nil, _, _), do: false
  end

  defimpl Canada.Can, for: nil do
    def can?(nil, _, _), do: false
  end
end                                                                                                                                                                                                                                       end