```ruby
class RenameMyMemberAndMyDeputyToMemberAndDeputy < Mongoid::Migration
  def self.up
    PositionApplication.all.each do |a|
      a.member = a.my_member
      a.deputy = a.my_deputy
      a.save
    end
  end

  def self.down
    PositionApplication.all.each do |a|
      a.my_member = a.member
      a.my_deputy = a.deputy
      a.save
    end
  end
end
```

Fix migration to clear old unused attributes
user
```ruby
class RenameMyMemberAndMyDeputyToMemberAndDeputy < Mongoid::Migration
  def self.up
    PositionApplication.all.each do |a|
      a[:member_id] = a[:my_member_id] if a[:my_member_id]
      a[:deputy_id] = a[:my_deputy_id] if a[:my_deputy_id]
      a.remove_attribute(:my_member_id)
      a.remove_attribute(:my_deputy_id)
      a.save
    end
  end

  def self.down
    PositionApplication.all.each do |a|
      a[:my_member_id] = a[:member_id] if a[:member_id]
      a[:my_deputy_id] = a[:deputy_id] if a[:deputy_id]
      a.remove_attribute(:member_id)
      a.remove_attribute(:deputy_id)
      a.save
    end
  end
end
```
assistant