def change do
legacy_tags = Map.keys(@old_new_map)
- from(u in User, where: fragment("? && ?", u.tags, ^legacy_tags))
- |> Repo.all()
+ from(u in User,
+ where: fragment("? && ?", u.tags, ^legacy_tags),
+ select: struct(u, [:tags, :id])
+ )
+ |> Repo.chunk_stream(100)
|> Enum.each(fn user ->
fix_tags_changeset(user)
|> Repo.update()