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nldoc_spec

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Elixir implementation of the NLdoc Spec for documents.

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nldoc_spec lib nldoc spec table_row.ex
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lib/nldoc/spec/table_row.ex 

defmodule NLdoc.Spec.TableRow do

  @moduledoc """

  This module defines the Ecto schema for the NLdoc spec TableRow object.

  """

  use NLdoc.Spec.Schema, type: "https://spec.nldoc.nl/Resource/TableRow"



  alias NLdoc.Spec.{TableCell, TableHeader}



  typed_embedded_schema null: false do

    field :id, Ecto.UUID

    field :type, :string, default: @resource_type



    field(:children, {:array, PolymorphicEmbed},

      types: map([TableCell, TableHeader]),

      type_field_name: :type,

      on_replace: :delete,

      default: [],

      array?: true

    ) :: [TableCell.t() | TableHeader.t()]



    field(:descriptors, {:array, PolymorphicEmbed},

      types: map(NLdoc.Spec.descriptors()),

      type_field_name: :type,

      on_replace: :delete,

      default: [],

      array?: true

    ) :: [NLdoc.Spec.descriptor()]

  end



  def changeset(object, attrs) do

    object

    |> cast(attrs, [:id, :type], @cast_opts)

    |> cast_polymorphic_embed(:children, @cast_opts)

    |> cast_polymorphic_embed(:descriptors, @cast_opts)

    |> validate_required([:id, :type])

    |> validate_inclusion(:type, [@resource_type])

    |> validate_has_children(attrs)

  end



  def validate_has_children(changeset, attrs) do

    if at_least_one_element?(attrs[:children]) or at_least_one_element?(attrs["children"]) do

      changeset

    else

      add_error(changeset, :children, "must have at least one element")

    end

  end



  @spec at_least_one_element?(list() | nil) :: boolean()

  def at_least_one_element?(nil), do: false

  def at_least_one_element?([]), do: false

  def at_least_one_element?([_ | _]), do: true

end