to_existing_atom blows up when loading new values from DB about ecto_atom HOT 2 OPEN

Warning: this function creates atoms dynamically and atoms are not garbage-collected. Therefore, string should not be an untrusted value, such as input received from a socket or during a web request. Consider using to_existing_atom/1 instead.

See https://hexdocs.pm/elixir/String.html#to_atom/1

from ecto_atom.

I created a version using the new Ecto.ParameterizedType behaviour that does what you're asking:

https://gist.github.com/voughtdq/a4930fd9c8ce10f2899a3476e94aba1a

from ecto_atom.