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Compose Ecto queries without effort

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query_builder lib query order_by.ex
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lib/query/order_by.ex 

defmodule QueryBuilder.Query.OrderBy do

  @moduledoc false



  require Ecto.Query

  import QueryBuilder.Utils



  def order_by(ecto_query, assoc_list, values) do

    dynamic = build_dynamic(assoc_list, values)



    Ecto.Query.order_by(ecto_query, ^dynamic)

  end



  defp build_dynamic(assoc_list, values) do

    values

    |> Enum.filter(&(&1 != []))

    |> Enum.map(fn

      {direction, %QueryBuilder.Aggregate{} = aggregate} when is_atom(direction) ->

        {direction, QueryBuilder.Aggregate.to_dynamic(assoc_list, aggregate)}



      {direction, %Ecto.Query.DynamicExpr{} = dynamic} when is_atom(direction) ->

        {direction, dynamic}



      {direction, custom_fun} when is_function(custom_fun) ->

        {direction, custom_fun.(&find_field_and_binding_from_token(assoc_list, &1))}



      {direction, field} ->

        {field, binding} = find_field_and_binding_from_token(assoc_list, field)

        {direction, Ecto.Query.dynamic([{^binding, x}], field(x, ^field))}

    end)

  end

end