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omtt_util lib util_changeset.ex
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lib/util_changeset.ex

defmodule OMTT.Util.Changeset do
def lowercase_field(changeset, fieldname) when is_atom(fieldname) do
field = Ecto.Changeset.get_field(changeset, fieldname)
Ecto.Changeset.put_change(changeset, fieldname, String.downcase(field))
end
end