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ja_serializer

0.18.0
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A serialization library implementing the jsonapi.org 1.0 spec suitable for use building JSON APIs in Phoenix and any other Plug based framework or app.

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ja_serializer lib ja_serializer builder attribute.ex
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lib/ja_serializer/builder/attribute.ex 

defmodule JaSerializer.Builder.Attribute do

  @moduledoc false



  alias JaSerializer.Builder.Utils



  defstruct [:key, :value]



  def build(context) do

    context

    |> attributes

    |> filter_fields(context)

    |> Enum.map(&do_build/1)

  end



  defp attributes(%{serializer: serializer, data: data, conn: conn}) do

    serializer.attributes(data, conn)

  end



  defp filter_fields(attrs, context = %{serializer: serializer, opts: opts}) do

    case opts[:fields] do

      fields when is_map(fields) ->

        do_filter(attrs, fields[serializer.type(context.data, context.conn)])



      _any ->

        attrs

    end

  end



  defp filter_fields(attrs, _), do: attrs



  defp do_filter(attrs, nil), do: attrs



  defp do_filter(attrs, fields) when is_list(fields),

    do: Map.take(attrs, fields)



  defp do_filter(attrs, fields) when is_binary(fields),

    do: do_filter(attrs, Utils.safe_atom_list(fields))



  defp do_build({key, value}), do: %__MODULE__{key: key, value: value}

end