Mobility accessing values in rake task

Question

A looked up class

  extend Mobility  
  translates :name, type: :string

is invoked in the following block of a CSV import function

Mobility.with_locale(:en)  do
  @regionmajor = Regionmajor.where(['nation_id = ? AND name = ?', row[0], row[1].to_s]).first
  @regionminor = Regionminor.where(['nation_id = ? AND name = ?', row[0], row[2].to_s]).first
end
Municipal.create(
  nation_id: row[0],
  regionmajor_id: @regionmajor.id,
  regionminor_id: @regionminor.id, [...]
 )

is not fuctioning as the object found is nil:

Error importing row because 'undefined method `id' for nil:NilClass

          regionmajor_id: @regionmajor.id,

attempting to query Regionmajor.where(['nation_id = ? AND name_en = ?', row[0], row[1].to_s]).first complains that the field is. logically so, inexistent.

Because of the mechanics of Mobility, in a key/value implementation, the name field is effectively nil.
How can this query be effectively be written so as to access the name_en value