Federate participations

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

priv/repo/migrations/20190813160207_add_url_and_uuid_to_participants.exs

@@ -0,0 +1,43 @@
+defmodule Mobilizon.Repo.Migrations.AddUrlAndUuidToParticipants do
+  use Ecto.Migration
+
+  def up do
+    drop(index(:participants, :event_id))
+    drop_if_exists(index(:participants, :account_id))
+    drop_if_exists(index(:participants, :actor_id))
+    drop(constraint(:participants, "participants_event_id_fkey"))
+
+    # This is because even though we renamed the table accounts to actors indexes kept this name
+    drop_if_exists(constraint(:participants, "participants_account_id_fkey"))
+    drop_if_exists(constraint(:participants, "participants_actor_id_fkey"))
+    drop(constraint(:participants, "participants_pkey"))
+
+    alter table(:participants, primary_key: false) do
+      modify(:event_id, references(:events, on_delete: :delete_all), primary_key: false)
+      modify(:actor_id, references(:actors, on_delete: :delete_all), primary_key: false)
+      add(:id, :uuid, primary_key: true)
+      add(:url, :string, null: false)
+    end
+
+    create(index(:participants, :event_id))
+    create(index(:participants, :actor_id))
+  end
+
+  def down do
+    drop(index(:participants, :event_id))
+    drop(index(:participants, :actor_id))
+    drop(constraint(:participants, "participants_event_id_fkey"))
+    drop(constraint(:participants, "participants_actor_id_fkey"))
+    drop(constraint(:participants, "participants_pkey"))
+
+    alter table(:participants, primary_key: false) do
+      modify(:event_id, references(:events, on_delete: :nothing), primary_key: true)
+      modify(:actor_id, references(:actors, on_delete: :nothing), primary_key: true)
+      remove(:id)
+      remove(:url)
+    end
+
+    create(index(:participants, :event_id))
+    create(index(:participants, :actor_id))
+  end
+end