Move Participant role from integer to enum

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

priv/repo/migrations/20190207134142_move_participant_role_to_enum.exs

@@ -0,0 +1,42 @@
+defmodule Mobilizon.Repo.Migrations.MoveParticipantRoleToEnum do
+  use Ecto.Migration
+  alias Mobilizon.Events.ParticipantRoleEnum
+
+  def up do
+    ParticipantRoleEnum.create_type()
+
+    alter table(:participants) do
+      add(:role_tmp, ParticipantRoleEnum.type(), default: "participant")
+    end
+
+    execute "UPDATE participants set role_tmp = 'not_approved' where role = 0"
+    execute "UPDATE participants set role_tmp = 'participant' where role = 1"
+    execute "UPDATE participants set role_tmp = 'moderator' where role = 2"
+    execute "UPDATE participants set role_tmp = 'administrator' where role = 3"
+    execute "UPDATE participants set role_tmp = 'creator' where role = 4"
+
+    alter table(:participants) do
+      remove(:role)
+    end
+    rename table(:participants), :role_tmp, to: :role
+  end
+
+  def down do
+    alter table(:participants) do
+      add(:role_tmp, :integer, default: 1)
+    end
+
+    execute "UPDATE participants set role_tmp = 0 where role = 'not_approved'"
+    execute "UPDATE participants set role_tmp = 1 where role = 'participant'"
+    execute "UPDATE participants set role_tmp = 2 where role = 'moderator'"
+    execute "UPDATE participants set role_tmp = 3 where role = 'administrator'"
+    execute "UPDATE participants set role_tmp = 4 where role = 'creator'"
+
+    alter table(:participants) do
+      remove(:role)
+    end
+    ParticipantRoleEnum.drop_type()
+
+    rename table(:participants), :role_tmp, to: :role
+  end
+end