       iex> ApmIssues.Repository.drop!
       iex> ApmIssues.Repository.seed()
       iex> all = ApmIssues.Repository.all()
-      iex> Enum.map(all, fn({_p,i}) -> i end)
+      iex> ApmIssues.Repository.ids(all)
       ["Item-2.2", "Item-2.1", "Item-2", "Item-1"]
   """
   def all() do

      r != ref 
    end)
  end
end



  ## Example:
      iex> roots = ApmIssues.Repository.root_issues()
      iex> ApmIssues.Repository.ids(roots)
      ["Item-2", "Item-1"]
  """
  def root_issues() do
