Rails Internationalization (I18n) in model validations: Possible or not?

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The solution is to NOT include any custom message keys in the models, like…

:message => I18n.t('activerecord.errors.models.my_model.attributes.whatever.please_select_whatever')

The model will then apply the default message keys, for example “:inclusion” in the case of “validates_inclusion_of”

…and in config/locales/en.yml you need to have:

en:
  activerecord:
    errors:
      models:
        my_model:
          attributes:
            whatever:
              inclusion: "Please select whatever." # see default key: "inclusion"

for reference, check out the respective Rails guide:

http://guides.rubyonrails.org/i18n.html#translations-for-active-record-models

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