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# We have strange bug: when company's fresher salary is updated, CompanyAnnouncement.track_update
  # method is called.
  # This method helps to see, was object changed or not.
  # This is workaround. We should get rid of this method in future.

  def self.object_changed?(obj)
    # Warning: We can't have "return true if obj.changed?" here, because sometimes changed? method
    # returns true when object was not really changed.
    return false if !obj.changed?

    obj.changes.each do |k, v|
      if v[0] != v[1] && k != 'updated_at'
        return true
      end
    end
    false
  end