```ruby
class String
  def to_id
    BSON::ObjectId self
  end
end
class BSON::ObjectId
  def to_id
    self
  end
end
```

Revert "Change ObjectID to ObjectId"
user
```ruby
class String
  def to_id
    BSON::ObjectID self
  end
end
class BSON::ObjectID
  def to_id
    self
  end
end
```
assistant