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query_builder

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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, value) do

    apply_order_values(ecto_query, assoc_list, List.wrap(value))

  end



  defp apply_order_values(query, _assoc_list, []), do: query



  defp apply_order_values(query, assoc_list, [order | tail]) do

    query = apply_order(query, assoc_list, order)

    apply_order_values(query, assoc_list, tail)

  end



  defp apply_order(query, assoc_list, {field, direction}) do

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



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

  end

end