My understanding is this default only applies to new structs, it doesn’t do anything for change casts.
To prevent writing nil to the db I think you need to make a custom validator as well:
defp validate_not_null(changeset, fields) do
dbg(changeset)
Enum.reduce(fields, changeset, fn field, changeset ->
case {changed?(changeset, field), get_change(changeset, field)} do
{true, nil} -> add_error(changeset, field, "can't be null")
_ -> changeset
end
end)
end
And then hopefully overriding the empty_values to not include "" will keep the Changeset from transforming empty string’s to nil.
But it’s quite a bit of fighting against Ecto’s standard behavior.
