```ruby
class Reply < ActiveRecord::Base
  scope :base
  belongs_to :topic, :include => [:replies]
  belongs_to :developer

  validates_presence_of :content
end
```

Use the new scope syntax
user
```ruby
class Reply < ActiveRecord::Base
  scope :base, -> { scoped }
  belongs_to :topic, :include => [:replies]
  belongs_to :developer

  validates_presence_of :content
end
```
assistant