Remove events when deleting organizer

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

priv/repo/migrations/20190823132816_remove_events_when_deleting_organizer.exs

@@ -0,0 +1,19 @@
+defmodule Mobilizon.Repo.Migrations.RemoveEventsWhenDeletingOrganizer do
+  use Ecto.Migration
+
+  def up do
+    drop(constraint(:events, "events_organizer_account_id_fkey"))
+
+    alter table(:events) do
+      modify(:organizer_actor_id, references(:actors, on_delete: :delete_all))
+    end
+  end
+
+  def down do
+    drop(constraint(:events, "events_organizer_actor_id_fkey"))
+
+    alter table(:events) do
+      modify(:organizer_actor_id, references(:actors, on_delete: :nothing))
+    end
+  end
+end