```ruby
class ActivitySessionSerializer < ActiveModel::Serializer
  attributes :uid, :percentage, :state, :completed_at, :data, :temporary,
              :activity_uid, :anonymous

  has_many :concept_results
end
```

Stop sending the concept result back to the app when we are done as they aren't needed.
user
```ruby
class ActivitySessionSerializer < ActiveModel::Serializer
  attributes :uid, :percentage, :state, :completed_at, :data, :temporary,
              :activity_uid, :anonymous

  # has_many :concept_results
end
```
assistant