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List helpers used in other upcoming packages under mavuio/*

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mavu_list lib mavu_list_totals.ex
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lib/mavu_list_totals.ex 

defmodule MavuList.Totals do

  @moduledoc false



  import Ecto.Query



  def total_entries(query, repo, caller) do

    total_entries =

      query

      |> exclude(:preload)

      |> exclude(:order_by)

      |> prepare_select

      |> count

      |> repo.one(caller: caller)



    total_entries || 0

  end



  defp prepare_select(

         %{

           group_bys: [

             %Ecto.Query.QueryExpr{

               expr: [

                 {{:., [], [{:&, [], [source_index]}, field]}, [], []} | _

               ]

             }

             | _

           ]

         } = query

       ) do

    query

    |> exclude(:select)

    |> select([{x, source_index}], struct(x, ^[field]))

  end



  defp prepare_select(query) do

    query

    |> exclude(:select)

  end



  defp count(query) do

    query

    |> subquery

    |> select(count("*"))

  end

end