[#1033] Fix database migrations

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

@@ -14,7 +14,7 @@ defmodule Pleroma.Repo.Migrations.AddFtsIndexToObjectsTwo do
       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 index if not exists 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()")
@@ -23,12 +23,12 @@ defmodule Pleroma.Repo.Migrations.AddFtsIndexToObjectsTwo do
   end
 
   def down do
-    execute "drop index objects_fts"
-    execute "drop trigger tsvectorupdate on objects"
-    execute "drop function objects_fts_update()"
+    execute "drop index if exists objects_fts"
+    execute "drop trigger if exists tsvectorupdate on objects"
+    execute "drop function if exists 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)
+    create_if_not_exists index(:objects, ["(to_tsvector('english', data->>'content'))"], using: :gin, name: :objects_fts)
   end
 end