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priv/repo/optional_migrations/rum_indexing/20190510135645_add_fts_index_to_objects_two.exs

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+defmodule Pleroma.Repo.Migrations.AddFtsIndexToObjectsTwo do
+  use Ecto.Migration
+
+  def up do
+    execute("create extension if not exists rum")
+    drop_if_exists index(:objects, ["(to_tsvector('english', data->>'content'))"], using: :gin, name: :objects_fts)
+    alter table(:objects) do
+      add(:fts_content, :tsvector)
+    end
+
+    execute("CREATE FUNCTION objects_fts_update() RETURNS trigger AS $$
+    begin
+      new.fts_content := to_tsvector('english', new.data->>'content');
+      return new;
+    end
+    $$ LANGUAGE plpgsql")
+    execute("create index objects_fts on objects using RUM (fts_content rum_tsvector_addon_ops, inserted_at) with (attach = 'inserted_at', to = 'fts_content');")
+
+    execute("CREATE TRIGGER tsvectorupdate BEFORE INSERT OR UPDATE ON objects
+    FOR EACH ROW EXECUTE PROCEDURE objects_fts_update()")
+
+    execute("UPDATE objects SET updated_at = NOW()")
+    execute("vacuum analyze")
+  end
+
+  def down do
+    execute "drop index objects_fts"
+    execute "drop trigger tsvectorupdate on objects"
+    execute "drop function objects_fts_update()"
+    alter table(:objects) do
+      remove(:fts_content, :tsvector)
+    end
+    create index(:objects, ["(to_tsvector('english', data->>'content'))"], using: :gin, name: :objects_fts)
+    execute("vacuum analyze")
+  end
+end