Mobility should save all record attributes shouldn't it?

Question

I added a virtual attribute to a record via attribute like this.

class Question < ApplicationRecord
  extend Mobility

  attribute :hint
  translates :hint, type: :text
end

Works so far. Even the by Mobility added methods like question.hint_fr= etc. are available. Now I assumed Mobility would on question.save also create the corresponding Mobility::Backends::ActiveRecord::KeyValue::StringTranslation record, but it doesn't. Why doesn't it? What am I missing?

Thanks a lot in advance for your help.

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Update: I fall into a trap. I had the option column_fallback true set and then when Mobility.locale and I18n.default_locale where the same, for some reason the attributes translation was not saved. If I disable the option column_fallback then the translation gets saved as expected.

It seems for me that Mobility never saves a translation if Mobility.locale and I18n.default_locale are the same. Which caused some headache to me because together with the column_fallback true option this leads to rather unexpected behaviour. Imagine I18n.default_locale is :de and Mobility.locale too and then you map fallbacks to e.g. {:fr => :de} which on record attribute access an environment with Mobility.local = :fr then leads to nil because the :de translation actually does not exist.