Make Categories a predefined list

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

Allow null values for categories for now

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/mobilizon_web/views/activity_pub/object_view.ex

@@ -1,6 +1,5 @@
 defmodule MobilizonWeb.ActivityPub.ObjectView do
   use MobilizonWeb, :view
-  alias MobilizonWeb.ActivityPub.ObjectView
   alias Mobilizon.Service.ActivityPub.Utils
 
   def render("event.json", %{event: event}) do
@@ -9,7 +8,7 @@ defmodule MobilizonWeb.ActivityPub.ObjectView do
       "actor" => event["actor"],
       "id" => event["id"],
       "name" => event["title"],
-      "category" => render_one(event["category"], ObjectView, "category.json", as: :category),
+      "category" => event["category"],
       "content" => event["summary"],
       "mediaType" => "text/html"
       # "published" => Timex.format!(event.inserted_at, "{ISO:Extended}"),
@@ -35,15 +34,4 @@ defmodule MobilizonWeb.ActivityPub.ObjectView do
 
     Map.merge(comment, Utils.make_json_ld_header())
   end
-
-  def render("category.json", %{category: category}) when not is_nil(category) do
-    %{
-      "identifier" => category.id,
-      "name" => category.title
-    }
-  end
-
-  def render("category.json", %{category: _category}) do
-    nil
-  end
 end