Put objects in inserted activties into the db.

lib/pleroma/object.ex

 defmodule Pleroma.Object do
   use Ecto.Schema
+  alias Pleroma.{Repo, Object}
+  import Ecto.Query
 
   schema "objects" do
     field :data, :map
 
     timestamps()
   end
+
+  def get_by_ap_id(ap_id) do
+    Repo.one(from object in Object,
+      where: fragment("? @> ?", object.data, ^%{id: ap_id}))
+  end
 end

lib/pleroma/web/activity_pub/activity_pub.ex

@@ -8,6 +8,7 @@ def insert(map) when is_map(map) do
 
     map = if map["object"] do
       object = Map.put_new_lazy(map["object"], "id", &generate_object_id/0)
+      Repo.insert!(%Object{data: object})
       Map.put(map, "object", object)
     else
       map

test/web/activity_pub/activity_pub_test.exs

@@ -25,7 +25,7 @@ test "inserts a given map into the activity database, giving it an id if it has
       assert activity.data["id"] == given_id
     end
 
-    test "adds an id to a given object if it lacks one" do
+    test "adds an id to a given object if it lacks one and inserts it to the object database" do
       data = %{
         "object" => %{
           "ok" => true
@@ -34,6 +34,7 @@ test "adds an id to a given object if it lacks one" do
 
       {:ok, %Activity{} = activity} = ActivityPub.insert(data)
       assert is_binary(activity.data["object"]["id"])
+      assert %Object{} = Object.get_by_ap_id(activity.data["object"]["id"])
     end
   end