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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(%QueryBuilder.Query{ecto_query: ecto_query, token: token}, assoc_fields, value) do

    token = QueryBuilder.Token.token(ecto_query, token, assoc_fields)



    %QueryBuilder.Query{ecto_query: ecto_query, token: token} =

      QueryBuilder.JoinMaker.make_joins(ecto_query, token)



    %QueryBuilder.Query{

      ecto_query: apply_order_values(ecto_query, token, List.wrap(value)),

      token: token

    }

  end



  def order_by(query, assoc_fields, value) do

    order_by(%QueryBuilder.Query{ecto_query: query, token: nil}, assoc_fields, value)

  end



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



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

    query = apply_order(query, token, order)

    apply_order_values(query, token, tail)

  end



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

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



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

  end

end