defmodule Mobilizon.Posts.Post.TitleSlug do @moduledoc """ Module to generate the slug for posts """ use EctoAutoslugField.Slug, from: [:title, :id], to: :slug def build_slug([title, id], _changeset) do [title, ShortUUID.encode!(id)] |> Enum.join("-") |> Slugger.slugify() end def build_slug(_, _), do: nil end defmodule Mobilizon.Posts.Post do @moduledoc """ Module that represent Posts published by groups """ use Ecto.Schema import Ecto.Changeset alias Ecto.Changeset alias Mobilizon.Actors.Actor alias Mobilizon.Events.Tag alias Mobilizon.Media alias Mobilizon.Media.Picture alias Mobilizon.Posts.Post.TitleSlug alias Mobilizon.Posts.PostVisibility alias Mobilizon.Web.Endpoint alias Mobilizon.Web.Router.Helpers, as: Routes import Mobilizon.Web.Gettext @type t :: %__MODULE__{ url: String.t(), local: boolean, slug: String.t(), body: String.t(), title: String.t(), draft: boolean, visibility: PostVisibility.t(), publish_at: DateTime.t(), author: Actor.t(), attributed_to: Actor.t(), picture: Picture.t(), tags: [Tag.t()] } @primary_key {:id, Ecto.UUID, autogenerate: true} schema "posts" do field(:body, :string) field(:draft, :boolean, default: false) field(:local, :boolean, default: true) field(:slug, TitleSlug.Type) field(:title, :string) field(:url, :string) field(:publish_at, :utc_datetime) field(:visibility, PostVisibility, default_value: :public) belongs_to(:author, Actor) belongs_to(:attributed_to, Actor) belongs_to(:picture, Picture, on_replace: :update) many_to_many(:tags, Tag, join_through: "posts_tags", on_replace: :delete) timestamps() end @required_attrs [ :id, :title, :body, :draft, :slug, :url, :author_id, :attributed_to_id ] @optional_attrs [:picture_id, :local, :publish_at, :visibility] @attrs @required_attrs ++ @optional_attrs @doc false def changeset(%__MODULE__{} = post, attrs) do post |> cast(attrs, @attrs) |> maybe_generate_id() |> put_tags(attrs) |> maybe_put_publish_date() |> put_picture(attrs) # Validate ID and title here because they're needed for slug |> validate_required(:id) |> validate_required(:title, message: gettext("A title is required for the post")) |> validate_required(:body, message: gettext("A text is required for the post")) |> TitleSlug.maybe_generate_slug() |> TitleSlug.unique_constraint() |> maybe_generate_url() |> validate_required(@required_attrs -- [:slug, :url]) end defp maybe_generate_id(%Ecto.Changeset{} = changeset) do case fetch_field(changeset, :id) do res when res in [:error, {:data, nil}] -> put_change(changeset, :id, Ecto.UUID.generate()) _ -> changeset end end @spec maybe_generate_url(Ecto.Changeset.t()) :: Ecto.Changeset.t() defp maybe_generate_url(%Ecto.Changeset{} = changeset) do with res when res in [:error, {:data, nil}] <- fetch_field(changeset, :url), {changes, id_and_slug} when changes in [:changes, :data] <- fetch_field(changeset, :slug), url when is_binary(url) <- generate_url(id_and_slug) do put_change(changeset, :url, url) else _ -> changeset end end @spec generate_url(String.t()) :: String.t() defp generate_url(id_and_slug) when is_binary(id_and_slug), do: Routes.page_url(Endpoint, :post, id_and_slug) defp generate_url(_), do: nil @spec put_tags(Ecto.Changeset.t(), map) :: Ecto.Changeset.t() defp put_tags(changeset, %{"tags" => tags}), do: put_assoc(changeset, :tags, Enum.map(tags, &process_tag/1)) defp put_tags(changeset, %{tags: tags}), do: put_assoc(changeset, :tags, Enum.map(tags, &process_tag/1)) defp put_tags(changeset, _), do: changeset defp process_tag(tag), do: Tag.changeset(%Tag{}, tag) defp maybe_put_publish_date(%Changeset{} = changeset) do publish_at = if get_field(changeset, :draft, true) == false, do: DateTime.utc_now() |> DateTime.truncate(:second), else: nil put_change(changeset, :publish_at, publish_at) end # In case the provided picture is an existing one @spec put_picture(Changeset.t(), map) :: Changeset.t() defp put_picture(%Changeset{} = changeset, %{picture: %{picture_id: id} = _picture}) do case Media.get_picture!(id) do %Picture{} = picture -> put_assoc(changeset, :picture, picture) _ -> changeset end end # In case it's a new picture defp put_picture(%Changeset{} = changeset, _attrs) do cast_assoc(changeset, :picture) end end